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0.3.0 HX711
This commit is contained in:
rob tillaart
parent
36c3e468a0
commit
b59bfcd56f
@ -2,6 +2,10 @@ compile:
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# Choosing to run compilation tests on 2 different Arduino platforms
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platforms:
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- uno
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- leonardo
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- due
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- zero
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# - due
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# - zero
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# - leonardo
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- m4
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- esp32
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# - esp8266
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# - mega2560
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@ -4,11 +4,14 @@ name: Arduino CI
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on: [push, pull_request]
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jobs:
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arduino_ci:
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runTest:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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# - uses: Arduino-CI/action@latest
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- uses: Arduino-CI/action@master
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# Arduino-CI/action@v0.1.1
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- uses: ruby/setup-ruby@v1
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with:
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ruby-version: 2.6
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- run: |
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gem install arduino_ci
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arduino_ci.rb
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@ -1,7 +1,7 @@
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//
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// FILE: HX711.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.3
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// VERSION: 0.3.0
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// PURPOSE: Library for Loadcells for UNO
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// URL: https://github.com/RobTillaart/HX711
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//
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@ -12,6 +12,9 @@
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// 0.2.1 2020-12-28 add arduino-ci + unit test
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// 0.2.2 2021-05-10 add read_median(), fix typo, add mode operandi
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// 0.2.3 2021-05-26 add running_average() mode
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// 0.3.0 2021-11-14 fix #11 shiftIn timing
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// update build-CI, readme.md, badges
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#include "HX711.h"
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@ -28,7 +31,7 @@ HX711::~HX711() {}
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void HX711::begin(uint8_t dataPin, uint8_t clockPin)
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{
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_dataPin = dataPin;
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_dataPin = dataPin;
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_clockPin = clockPin;
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pinMode(_dataPin, INPUT);
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@ -55,6 +58,11 @@ bool HX711::is_ready()
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}
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// from datasheet page 4
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// When output data is not ready for retrieval,
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// digital output pin DOUT is high. Serial clock
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// input PD_SCK should be low. When DOUT goes
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// to low, it indicates data is ready for retrieval.
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float HX711::read()
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{
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// this waiting takes most time...
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@ -69,9 +77,12 @@ float HX711::read()
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noInterrupts();
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// Pulse the clock pin 24 times to read the data.
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v.data[2] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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v.data[1] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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v.data[0] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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// v.data[2] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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// v.data[1] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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// v.data[0] = shiftIn(_dataPin, _clockPin, MSBFIRST);
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v.data[2] = _shiftIn();
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v.data[1] = _shiftIn();
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v.data[0] = _shiftIn();
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// TABLE 3 page 4 datasheet
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// only default verified, so other values not supported yet
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@ -271,4 +282,27 @@ void HX711::power_up()
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digitalWrite(_clockPin, LOW);
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}
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// MSB_FIRST optimized shiftIn
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// see datasheet page 5 for timing
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uint8_t HX711::_shiftIn()
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{
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uint8_t value = 0;
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uint8_t mask = 0x80;
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while(mask > 0)
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{
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digitalWrite(_clockPin, HIGH);
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delayMicroseconds(1); // T2 >= 0.2 us
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if (digitalRead(_dataPin) == HIGH)
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{
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value |= mask;
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}
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digitalWrite(_clockPin, LOW);
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delayMicroseconds(1); // keep duty cycle ~50%
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mask >>= 1;
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}
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return value;
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}
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// -- END OF FILE --
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@ -2,7 +2,7 @@
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//
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// FILE: HX711.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.3
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// VERSION: 0.3.0
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// PURPOSE: Library for Loadcells for UNO
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// URL: https://github.com/RobTillaart/HX711
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//
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@ -15,7 +15,7 @@
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#include "Arduino.h"
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#define HX711_LIB_VERSION (F("0.2.3"))
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#define HX711_LIB_VERSION (F("0.3.0"))
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const uint8_t HX711_AVERAGE_MODE = 0x00;
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@ -39,7 +39,7 @@ public:
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void reset();
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// checks if loadcell is ready to read.
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// checks if load cell is ready to read.
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bool is_ready();
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// wait until ready,
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@ -142,6 +142,7 @@ private:
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uint8_t _mode = 0;
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void _insertSort(float * array, uint8_t size);
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uint8_t _shiftIn();
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};
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// -- END OF FILE --
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@ -1,22 +1,39 @@
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/HX711/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/HX711/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/HX711/blob/master/LICENSE)
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[](https://github.com/RobTillaart/HX711/releases)
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# HX711
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Arduino library for HX711 24 bit ADC used for load cells and scales.
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Arduino library for HX711 24 bit ADC used for load cells and scales.
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## Description
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This HX711 library has an interface which is a superset of a library made by bogde.
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This HX711 library has an interface which is a superset of a library made by Bogde.
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Some missing functions were added to get more info from the lib.
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Another important difference is that this library uses floats. The 23 bits mantisse
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of the IEE754 float matches the 24 bit ADC very well. Furthermore it gave a smaller
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footprint.
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Another important difference is that this library uses floats.
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The 23 bits mantissa of the IEE754 float matches the 24 bit ADC very well.
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Furthermore it gave a smaller footprint.
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### Breaking change 0.3.0
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In issue #11 it became clear that the timing of the default **shiftIn()** function that
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reads the value of the internal ADC was too fast on some processor boards for the HX711.
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This resulted in missing the first = sign bit and value read could be a factor two
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higher than should. If one calibrated the sensor this would be compensated with the
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factor that is derived in the calibration process.
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In 0.3.0 a dedicated **shiftIn()** function is added into this library that uses hard
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coded delays to keep the timing of the clock within datasheet parameters.
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This should guarantee that the sign bit is read correctly on all platforms.
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Drawback is that reading the HX711 takes an ~50 extra microseconds.
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How much this affects performance is to be investigated.
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## Main flow
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@ -37,26 +54,105 @@ Steps to take for calibration
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1. save the offset and scale for later use e.g. EEPROM.
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## Pricing
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## Interface
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#### Base
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- **HX711()** constructor.
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- **~HX711()**
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- **void begin(uint8_t dataPin, uint8_t clockPin)** sets a fixed gain 128 for now.
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- **void reset()** set internal state to start condition.
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- **bool is_ready()** checks if load cell is ready to read.
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- **void wait_ready(uint32_t ms = 0)** wait until ready, check every ms.
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- **bool wait_ready_retry(uint8_t retries = 3, uint32_t ms = 0)** wait max retries.
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- **bool wait_ready_timeout(uint32_t timeout = 1000, uint32_t ms = 0)** wait max timeout.
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- **float read()** raw read.
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- **float read_average(uint8_t times = 10)** get average of times raw reads. times = 1 or more.
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- **float read_median(uint8_t times = 7)** get median of multiple raw reads.
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times = 3..15 - odd numbers preferred.
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- **float read_medavg(uint8_t times = 7)** get average of "middle half" of multiple raw reads.
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times = 3..15 - odd numbers preferred.
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- **float read_runavg(uint8_t times = 7, float alpha = 0.5)** get running average over times measurements.
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The weight alpha can be set to any value between 0 and 1, times >= 1.
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- **uint32_t last_read()** returns timestamp in milliseconds.
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#### Gain
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read datasheet - see also Connections HX711 below
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- **void set_gain(uint8_t gain = 128)** values: 128 (default), 64 32 - only 128 tested & verified.
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- **uint8_t get_gain()** returns set gain.
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#### Mode
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Get and set the operational mode for get_value() and indirect get_units().
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In median and medavg mode only 3..15 samples are allowed.
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- **void set_average_mode()**
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- **void set_median_mode()**
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- **void set_medavg_mode()**
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- **void set_runavg_mode()** default alpha = 0.5.
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- **uint8_t get_mode()**
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#### Get values
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get values corrected for offset and scale
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- **float get_value(uint8_t times = 1)** read value, corrected for offset.
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- **float get_units(uint8_t times = 1)** read value, converted to proper units.
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- **void set_scale(float scale = 1.0)** set scale factor; scale > 0.
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- **float get_scale()** returns set scale factor.
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- **void set_offset(long offset = 0)** idem.
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- **long get_offset()** idem.
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#### Tare & calibration
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Steps to take for calibration
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1. clear the scale
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1. call tare() to set the zero offset
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1. put a known weight on the scale
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1. call calibrate_scale(weight)
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1. scale is calculated.
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1. save the offset and scale for later use e.g. EEPROM.
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- **void tare(uint8_t times = 10)** call tare to calibrate zero level
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- **float get_tare()** idem.
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- **bool tare_set()** checks if a tare has been set.
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- **void calibrate_scale(uint16_t weight, uint8_t times = 10)** idem.
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#### Power management
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- **void power_down()** idem.
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- **void power_up()** idem.
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#### Pricing
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Some price functions were added to make it easy to use this library
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for pricing goods or for educational purposes. These functions are under discussion
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if they will stay. Another set of function to add weights together didn't make it in
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the 0.2.0 release, it is on a todo list.
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for pricing goods or for educational purposes.
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These functions are under discussion if they will stay.
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For weight conversion functions see https://github.com/RobTillaart/weight
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- **float get_price(uint8_t times = 1)** idem.
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- **void set_unit_price(float price = 1.0)** idem.
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- **float get_unit_price()** idem.
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## Notes
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### Scale values for loadcells
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### Scale values for load cells
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These scale values worked pretty well with a set of loadcells,
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Use calibrate to find your values.
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These scale values worked pretty well with a set of load cells I have,
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Use calibrate to find your favourite values.
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- 5 KG loadcell scale.set_scale(420.52);
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- 20 KG loadcell scale.set_scale(127.15);
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- 5 KG load cell scale.set_scale(420.52);
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- 20 KG load cell scale.set_scale(127.15);
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### Connections HX711
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@ -67,31 +163,32 @@ Use calibrate to find your values.
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### Connections
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| HX711 Pin | Color |
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|:----:|:----:|
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| E+ | red |
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| E- | black |
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| A- | white |
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| A+ | green |
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| B- | not connected |
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| B+ | not connected |
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| HX711 Pin | Colour |
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|:---------:|:--------------:|
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| E+ | red |
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| E- | black |
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| A- | white |
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| A+ | green |
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| B- | not connected |
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| B+ | not connected |
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| HX711 Pin | Color |
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|:----:|:----:|
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| E+ | red |
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| E- | black |
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| A- | blue |
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| A+ | white |
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| B- | not connected |
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| B+ | not connected |
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| HX711 Pin | Colour |
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|:---------:|:--------------:|
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| E+ | red |
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| E- | black |
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| A- | blue |
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| A+ | white |
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| B- | not connected |
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| B+ | not connected |
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### Temperature
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Loadcells do have a temperature related error.
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Load cells do have a temperature related error. (check datasheet)
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This can be reduced by doing the calibration and take the tare
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at the temperature one also does the measurements.
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at the temperature one also uses for the measurements.
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Another way to handle this is to add a good temperature sensor
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(e.g. DS18B20, SHT85) and compensate for the temperature
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@ -101,3 +198,17 @@ differences in your code.
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## Operation
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See examples
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## Future
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- update documentation
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- add examples
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- test different load cells
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- optimize the build-in **ShiftIn()** function to improve performance again.
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#### the adding scale
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- void weight_clr(), void weight_add(), float weight_get() - adding scale
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@ -9,6 +9,7 @@
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// 0.1.0 2020-06-16 initial version
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//
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// to be tested
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#include "HX711.h"
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@ -20,6 +21,7 @@ uint8_t clockPin = 7;
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float w1, w2, previous = 0;
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void setup()
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{
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Serial.begin(115200);
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@ -33,16 +35,17 @@ void setup()
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Serial.print("UNITS: ");
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Serial.println(scale.get_units(10));
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// loadcell factor 20 KG
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// load cell factor 20 KG
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// scale.set_scale(127.15);
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// loadcell factor 5 KG
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scale.set_scale(420.0983);
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// load cell factor 5 KG
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scale.set_scale(420.0983); // TODO you need to calibrate this yourself.
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scale.tare();
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Serial.print("UNITS: ");
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Serial.println(scale.get_units(10));
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}
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void loop()
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{
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// read until stable
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@ -71,4 +74,6 @@ void loop()
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delay(100);
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}
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// END OF FILE
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// -- END OF FILE --
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@ -9,6 +9,7 @@
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// 0.1.0 2020-06-16 initial version
|
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//
|
||||
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#include "HX711.h"
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HX711 scale;
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@ -54,6 +55,7 @@ void setup()
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scale.set_unit_price(0.031415); // we only have one price
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}
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||||
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||||
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||||
void loop()
|
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{
|
||||
Serial.print("UNITS: ");
|
||||
@ -63,4 +65,6 @@ void loop()
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delay(250);
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}
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||||
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// END OF FILE
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||||
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||||
// -- END OF FILE --
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||||
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@ -9,6 +9,7 @@
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// 0.1.0 2020-06-16 initial version
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||||
//
|
||||
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||||
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#include "HX711.h"
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HX711 scale;
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@ -48,11 +49,13 @@ void setup()
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Serial.println(scale.get_units(10));
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Serial.println("\nScale is calibrated, press a key to continue");
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// Serial.println(scale.get_scale());
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// Serial.println(scale.get_offset());
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while(!Serial.available());
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while(Serial.available()) Serial.read();
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}
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void loop()
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{
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Serial.print("UNITS: ");
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@ -60,4 +63,6 @@ void loop()
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delay(250);
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}
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// END OF FILE
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// -- END OF FILE --
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||||
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@ -9,6 +9,7 @@
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// 0.1.0 2020-06-15 initial version
|
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//
|
||||
|
||||
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||||
#include "HX711.h"
|
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HX711 scale;
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@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
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uint32_t start, stop;
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||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -34,11 +36,11 @@ void setup()
|
||||
measure(10);
|
||||
|
||||
// TODO find a nice solution for this calibration..
|
||||
// loadcell factor 20 KG
|
||||
// load cell factor 20 KG
|
||||
// scale.set_scale(127.15);
|
||||
|
||||
// loadcell factor 5 KG
|
||||
scale.set_scale(420.0983);
|
||||
// load cell factor 5 KG
|
||||
scale.set_scale(420.0983); // TODO you need to calibrate this yourself.
|
||||
// reset the scale to zero = 0
|
||||
scale.tare();
|
||||
|
||||
@ -54,6 +56,11 @@ void setup()
|
||||
delay(1000);
|
||||
measure(10);
|
||||
|
||||
/*
|
||||
* PERFORMANCE
|
||||
* 100x get_units(1) = 9404352 (UNO)
|
||||
* VAL: 0.05
|
||||
*/
|
||||
Serial.println("\nPERFORMANCE");
|
||||
start = micros();
|
||||
f = 0;
|
||||
@ -75,9 +82,9 @@ void setup()
|
||||
}
|
||||
Serial.print(" VAL:");
|
||||
Serial.println(f * 0.01, 4);
|
||||
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
// continuous scale 4x per second
|
||||
@ -86,6 +93,7 @@ void loop()
|
||||
delay(250);
|
||||
}
|
||||
|
||||
|
||||
void measure(uint8_t cnt)
|
||||
{
|
||||
Serial.print(" RAW: ");
|
||||
@ -100,3 +108,4 @@ void measure(uint8_t cnt)
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
// 0.1.0 2020-06-15 initial version
|
||||
//
|
||||
|
||||
|
||||
#include "HX711.h"
|
||||
|
||||
HX711 scale;
|
||||
@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
||||
uint32_t start, stop;
|
||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -30,21 +32,23 @@ void setup()
|
||||
scale.begin(dataPin, clockPin);
|
||||
|
||||
// TODO find a nice solution for this calibration..
|
||||
// loadcell factor 20 KG
|
||||
// load cell factor 20 KG
|
||||
// scale.set_scale(127.15);
|
||||
|
||||
// loadcell factor 5 KG
|
||||
scale.set_scale(420.0983);
|
||||
// load cell factor 5 KG
|
||||
scale.set_scale(420.0983); // TODO you need to calibrate this yourself.
|
||||
// reset the scale to zero = 0
|
||||
scale.tare();
|
||||
|
||||
measure();
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
void measure()
|
||||
{
|
||||
Serial.println("Counting get_units() calls for 1 minute...");
|
||||
@ -66,3 +70,4 @@ void measure()
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
// 0.1.0 2020-06-15 initial version
|
||||
//
|
||||
|
||||
|
||||
#include "HX711.h"
|
||||
|
||||
HX711 scale;
|
||||
@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
||||
uint32_t start, stop;
|
||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -30,14 +32,15 @@ void setup()
|
||||
scale.begin(dataPin, clockPin);
|
||||
|
||||
// TODO find a nice solution for this calibration..
|
||||
// loadcell factor 20 KG
|
||||
// load cell factor 20 KG
|
||||
// scale.set_scale(127.15);
|
||||
// loadcell factor 5 KG
|
||||
scale.set_scale(420.0983);
|
||||
// load cell factor 5 KG
|
||||
scale.set_scale(420.0983); // TODO you need to calibrate this yourself.
|
||||
// reset the scale to zero = 0
|
||||
scale.tare();
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
// continuous scale 4x per second
|
||||
@ -46,4 +49,6 @@ void loop()
|
||||
delay(250);
|
||||
}
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
// 0.1.0 2021-05-10 initial version
|
||||
//
|
||||
|
||||
|
||||
#include "HX711.h"
|
||||
|
||||
HX711 scale;
|
||||
@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
||||
uint32_t start, stop;
|
||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -30,10 +32,10 @@ void setup()
|
||||
scale.begin(dataPin, clockPin);
|
||||
|
||||
// TODO find a nice solution for this calibration..
|
||||
// loadcell factor 20 KG
|
||||
scale.set_scale(127.15);
|
||||
// load cell factor 20 KG
|
||||
scale.set_scale(127.15); // TODO you need to calibrate this yourself.
|
||||
|
||||
// loadcell factor 5 KG
|
||||
// load cell factor 5 KG
|
||||
// scale.set_scale(420.0983);
|
||||
// reset the scale to zero = 0
|
||||
scale.tare();
|
||||
@ -52,6 +54,7 @@ void setup()
|
||||
Serial.println(f, 2);
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
// continuous scale once per second
|
||||
@ -62,3 +65,4 @@ void loop()
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
// 0.1.0 2021-05-13 initial version
|
||||
//
|
||||
|
||||
|
||||
#include "HX711.h"
|
||||
|
||||
HX711 scale;
|
||||
@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
||||
uint32_t start, stop;
|
||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -52,6 +54,7 @@ void setup()
|
||||
Serial.println(f, 2);
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
// continuous scale once per second
|
||||
@ -60,4 +63,6 @@ void loop()
|
||||
delay(1000);
|
||||
}
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
// 0.1.0 2021-05-13 initial version
|
||||
//
|
||||
|
||||
|
||||
#include "HX711.h"
|
||||
|
||||
HX711 scale;
|
||||
@ -19,6 +20,7 @@ uint8_t clockPin = 7;
|
||||
uint32_t start, stop;
|
||||
volatile float f;
|
||||
|
||||
|
||||
void setup()
|
||||
{
|
||||
Serial.begin(115200);
|
||||
@ -91,8 +93,11 @@ void setup()
|
||||
Serial.println("\ndone...");
|
||||
}
|
||||
|
||||
|
||||
void loop()
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
|
||||
@ -1,8 +1,9 @@
|
||||
# Syntax Coloring Map For HX711
|
||||
# Syntax Colouring Map For HX711
|
||||
|
||||
# Datatypes (KEYWORD1)
|
||||
# Data types (KEYWORD1)
|
||||
HX711 KEYWORD1
|
||||
|
||||
|
||||
# Methods and Functions (KEYWORD2)
|
||||
begin KEYWORD2
|
||||
reset KEYWORD2
|
||||
@ -16,6 +17,7 @@ read KEYWORD2
|
||||
read_average KEYWORD2
|
||||
read_median KEYWORD2
|
||||
read_medavg KEYWORD2
|
||||
read_runavg KEYWORD2
|
||||
|
||||
set_average_mode KEYWORD2
|
||||
set_median_mode KEYWORD2
|
||||
@ -49,8 +51,13 @@ get_price KEYWORD2
|
||||
set_unit_price KEYWORD2
|
||||
get_unit_price KEYWORD2
|
||||
|
||||
|
||||
# Instances (KEYWORD2)
|
||||
|
||||
|
||||
# Constants (LITERAL1)
|
||||
HX711_LIB_VERSION LITERAL1
|
||||
|
||||
HX711_AVERAGE_MODE LITERAL1
|
||||
HX711_MEDIAN_MODE LITERAL1
|
||||
HX711_MEDAVG_MODE LITERAL1
|
||||
HX711_RUNAVG_MODE LITERAL1
|
||||
|
||||
@ -15,7 +15,7 @@
|
||||
"type": "git",
|
||||
"url": "https://github.com/RobTillaart/HX711"
|
||||
},
|
||||
"version": "0.2.3",
|
||||
"version": "0.3.0",
|
||||
"license": "MIT",
|
||||
"frameworks": "arduino",
|
||||
"platforms": "*"
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
name=HX711
|
||||
version=0.2.3
|
||||
version=0.3.0
|
||||
author=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
sentence=Arduino library for HX711 loadcell amplifier
|
||||
|
||||
@ -53,6 +53,7 @@ unittest(test_constructor)
|
||||
assertEqual(0, scale.last_read());
|
||||
}
|
||||
|
||||
|
||||
unittest(test_gain)
|
||||
{
|
||||
HX711 scale;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user