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0.2.3 ACS712

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rob tillaart 2021-10-16 11:40:09 +02:00
parent 5ad7d7b253
commit c24c7d2ee4
12 changed files with 77 additions and 52 deletions
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10
libraries/ACS712/.arduino-ci.yml
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@ -2,6 +2,10 @@ compile:
# Choosing to run compilation tests on 2 different Arduino platforms
platforms:
- uno
- leonardo
- due
- zero
# - due
# - zero
# - leonardo
- m4
- esp32
# - esp8266
# - mega2560

10
libraries/ACS712/.github/workflows/arduino_test_runner.yml vendored
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@ -4,10 +4,14 @@ name: Arduino CI
on: [push, pull_request]
jobs:
arduino_ci:
runTest:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- uses: Arduino-CI/action@master
# Arduino-CI/action@v0.1.1
- uses: ruby/setup-ruby@v1
with:
ruby-version: 2.6
- run: |
gem install arduino_ci
arduino_ci.rb

21
libraries/ACS712/ACS712.cpp
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@ -1,7 +1,7 @@
//
// FILE: ACS712.cpp
// AUTHOR: Rob Tillaart, Pete Thompson
// VERSION: 0.2.2
// VERSION: 0.2.3
// DATE: 2020-08-02
// PURPOSE: ACS712 library - current measurement
//
@ -14,6 +14,8 @@
// 0.2.0 2020-08-02 Add autoMidPoint
// 0.2.1 2020-12-06 Add Arduino-CI + readme + unit test + refactor
// 0.2.2 2021-06-23 support for more frequencies.
// 0.2.3 2021-10-15 changed frequencies to float, for optimal tuning.
// updated build CI, readme.md
#include "ACS712.h"
@ -30,16 +32,16 @@ ACS712::ACS712(uint8_t analogPin, float volts, uint16_t maxADC, uint8_t mVperA)
}
int ACS712::mA_AC(uint8_t freq)
int ACS712::mA_AC(float freq)
{
uint16_t period = (1000000UL + freq/2) / freq;
uint16_t period = round(1000000UL / freq);
uint16_t samples = 0;
uint16_t zeros = 0;
int _min, _max;
_min = _max = analogRead(_pin);
// remove expensive float operation from loop.
// remove expensive float operation from loop.
uint16_t zeroLevel = round(_noisemV/_mVpstep);
uint32_t start = micros();
@ -75,18 +77,19 @@ int ACS712::mA_AC(uint8_t freq)
int ACS712::mA_DC()
{
// read twice to stabilize...
// read twice to stabilize the ADC
analogRead(_pin);
int steps = analogRead(_pin) - _midPoint;
return 1000.0 * steps * _mVpstep / _mVperAmpere;
}
// configure by sampling for 2 cycles of AC
// Also works for DC as long as no current flowing
void ACS712::autoMidPoint(uint8_t freq)
// configure by sampling for 2 cycles of AC
// Also works for DC as long as no current flowing
// note this is blocking!
void ACS712::autoMidPoint(float freq)
{
uint16_t twoPeriods = (2000000UL + freq/2) / freq;
uint16_t twoPeriods = round(2000000UL / freq);
uint32_t total = 0;
uint32_t samples = 0;

10
libraries/ACS712/ACS712.h
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@ -2,16 +2,18 @@
//
// FILE: ACS712.h
// AUTHOR: Rob Tillaart
// VERSION: 0.2.2
// VERSION: 0.2.3
// DATE: 2020-08-02
// PURPOSE: ACS712 library - current measurement
//
// Tested with a RobotDyn ACS712 20A breakout + UNO.
//
#include "Arduino.h"
#define ACS712_LIB_VERSION (F("0.2.2"))
#define ACS712_LIB_VERSION (F("0.2.3"))
// ACS712_FF_SINUS == 1.0/sqrt(2) == 0.5 * sqrt(2)
// should be smaller in practice 0.5 ?
@ -38,7 +40,7 @@ class ACS712
// returns mA
// blocks 20-21 ms to sample a whole 50 or 60 Hz period.
// lower frequencies block longer.
int mA_AC(uint8_t freq = 50);
int mA_AC(float freq = 50);
// returns mA
@ -52,7 +54,7 @@ class ACS712
inline void incMidPoint() { _midPoint++; };
inline void decMidPoint() { _midPoint--; };
// Auto midPoint, assuming zero DC current or any AC current
void autoMidPoint(uint8_t freq = 50);
void autoMidPoint(float freq = 50);
// also known as crest factor; affects mA_AC() only

2
libraries/ACS712/examples/ACS712_20_AC/ACS712_20_AC.ino
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@ -16,7 +16,7 @@
ACS712 ACS(A0, 5.0, 1023, 100);
// ESP 32 example (requires resistors to step down the logic voltage)
//ACS712 ACS(25, 5.0, 4095, 185);
// ACS712 ACS(25, 5.0, 4095, 185);
void setup()

2
libraries/ACS712/examples/ACS712_20_AC_DEMO/ACS712_20_AC_DEMO.ino
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@ -16,7 +16,7 @@
ACS712 ACS(A0, 5.0, 1023, 100);
// ESP 32 example (requires resistors to step down the logic voltage)
//ACS712 ACS(25, 5.0, 4095, 185);
// ACS712 ACS(25, 5.0, 4095, 185);
void setup()

2
libraries/ACS712/examples/ACS712_20_DC/ACS712_20_DC.ino
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@ -16,7 +16,7 @@
ACS712 ACS(A0, 5.0, 1023, 100);
// ESP 32 example (requires resistors to step down the logic voltage)
//ACS712 ACS(25, 5.0, 4095, 185);
// ACS712 ACS(25, 5.0, 4095, 185);
void setup()

2
libraries/ACS712/examples/ACS712_20_DC_DEMO/ACS712_20_DC_DEMO.ino
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@ -16,7 +16,7 @@
ACS712 ACS(A0, 5.0, 1023, 100);
// ESP 32 example (requires resistors to step down the logic voltage)
//ACS712 ACS(25, 5.0, 4095, 185);
// ACS712 ACS(25, 5.0, 4095, 185);
void setup()

2
libraries/ACS712/library.json
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@ -21,7 +21,7 @@
"type": "git",
"url": "https://github.com/RobTillaart/ACS712.git"
},
"version": "0.2.2",
"version": "0.2.3",
"license": "MIT",
"frameworks": "arduino",
"platforms": "*"

2
libraries/ACS712/library.properties
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@ -1,5 +1,5 @@
name=ACS712
version=0.2.2
version=0.2.3
author=Rob Tillaart <rob.tillaart@gmail.com>, Pete Thompson <pete.thompson@yahoo.com>
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
sentence=ACS712 library for Arduino.

60
libraries/ACS712/readme.md
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@ -1,8 +1,11 @@
[![Arduino CI](https://github.com/RobTillaart/ACS712/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
[![Arduino-lint](https://github.com/RobTillaart/ACS712/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/ACS712/actions/workflows/arduino-lint.yml)
[![JSON check](https://github.com/RobTillaart/ACS712/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/ACS712/actions/workflows/jsoncheck.yml)
[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/ACS712/blob/master/LICENSE)
[![GitHub release](https://img.shields.io/github/release/RobTillaart/ACS712.svg?maxAge=3600)](https://github.com/RobTillaart/ACS712/releases)
# ACS712
Library for the ACS712 Current Sensor - 5A, 20A, 30A
@ -11,29 +14,32 @@ Library for the ACS712 Current Sensor - 5A, 20A, 30A
## Description
The ACS712 is a chip to measure current, both AC or DC. The chip has an
analog output that provides a voltage that is lineair with the current.
The ACS712 library supports only a built in ADC by means of analogRead().
analogue output that provides a voltage that is linear with the current.
The ACS712 library supports only a built in ADC by means of **analogRead()**.
There are 2 core functions:
- **int mA_DC()**
- **int mA_AC()**
- **int mA_AC(float freq = 50)** The frequency can be set to typically 50 or 60 Hz
however other values e.g. 50.1 or 40 or 123.456 are possible.
To measure DC current a single analogRead() with some conversion math is sufficient to get
a value. To stabilize the signal analogRead() is called twice.
To measure DC current a single **analogRead()** with some conversion maths is sufficient to get
a value. To stabilize the signal **analogRead()** is called twice.
To measure AC current **a blocking loop for 20 millis** is run to determine the
To measure AC current **a blocking loop for 20 milliseconds** is run to determine the
peak to peak value which is converted to the RMS value. To convert the peak2peak
value to RMS one need the so called crest or form factor. This factor depends heavily
on the signal form. For a perfect sinus the value is sqrt(2)/2.
on the signal form. For a perfect sinus the value is sqrt(2)/2 == 1/sqrt(2).
## Interface
#### Base
- **ACS712(analogPin, volts = 5.0, maxADC = 1023, mVperA = 100)** constructor. It defaults a 20 A type sensor, which is defined by the default value of mVperA. See below.
- **mA_AC(freq = 50)** blocks ~21 ms to sample a whole 50 or 60 Hz period. Since version 0.2.2 frequencies other than 50 and 60 are supported, the lower the frequency, the longer the blocking period.
- **mA_DC()** blocks < 1 ms as it just needs one analogue read.
- **ACS712(uint8_t analogPin, float volts = 5.0, uint16_t maxADC = 1023, uint8_t mVperA = 100)** constructor. It defaults a 20 A type sensor, which is defined by the default value of mVperA. See below.
- **int mA_AC(float freq = 50)** blocks ~21 ms (depending on the freq) to sample a whole 50 or 60 Hz period.
Since version 0.2.2 frequencies other integer values than 50 and 60 are supported, the lower the frequency, the longer the blocking period.
Since version 0.2.3 floating point frequencies are supported to tune optimally.
- **int mA_DC()** blocks < 1 ms as it just needs one **analogRead()**.
| type sensor | mVperA | LSB 5V-10bit |
@ -45,26 +51,27 @@ on the signal form. For a perfect sinus the value is sqrt(2)/2.
#### Midpoint
- **setMidPoint(mp)** sets midpoint for the ADC
- **autoMidPoint(uint8_t freq = 50)** Auto midPoint, assuming zero DC current or any AC current. Note it will block for 2 periods. Since version 0.2.2 frequencies other than 50 and 60 are supported.
- **getMidPoint()** read back the value set / determined.
- **incMidPoint()** manual increase midpoint, e.g. useful to manually adjust the midPoint in an interactive application.
- **decMidPoint()** manual decrease midpoint
- **void setMidPoint(uint16_t mp)** sets midpoint for the ADC conversion.
- **void autoMidPoint(float freq = 50)** Auto midPoint, assuming zero DC current or any AC current. Note it will block for 2 periods. Since version 0.2.2 frequencies other than 50 and 60 are supported.
By setting the frequency to e.g 1, the code will sample for 2 seconds, possibly getting a better average.
- **uint16_t getMidPoint()** read the value set / determined.
- **void incMidPoint()** manual increase midpoint, e.g. useful to manually adjust the midPoint in an interactive application.
- **void decMidPoint()** manual decrease midpoint.
#### Formfactor
Also known as crest factor; affects AC signals only.
- **setFormFactor(ff = ACS712_FF_SINUS)** manually sets form factor 0.0 .. 1.0,
- **getFormFactor()** returns current form factor
- **void setFormFactor(float ff = ACS712_FF_SINUS)** manually sets form factor, must be between 0.0 and 1.0
- **float getFormFactor()** returns current form factor.
The library has a number of predefined form factors
| definition | value | approx | notes |
|:---------------------|:--------------|:------:|:--------|
| ACS712_FF_SINUS | 1.0 / sqrt(2) | 0.707 | default |
| ACS712_FF_SQUARE | 1.0 | 1.000 | |
| ACS712_FF_SINUS | 1.0 / sqrt(2) | 0.707 | default |
| ACS712_FF_TRIANGLE | 1.0 / sqrt(3) | 0.577 | |
| | | | |
@ -77,16 +84,16 @@ to improve the quality of your measurements.
Default = 21 mV.
- **setNoisemV(noisemV = 21)** set noise level, is used to determine zero level e.g. in AC measurements.
- **getNoisemV()** returns set value
- **void setNoisemV(uint8_t noisemV = 21)** set noise level, is used to determine zero level e.g. in AC measurements.
- **uint8_t getNoisemV()** returns the set value.
#### mV per Ampere
Both for AC and DC. Is defined in the constructor and depends on
- **setmVperAmp(mva)** sets the milliVolt per Ampere measured.
- **getmVperAmp()** returns set value.
- **void setmVperAmp(uint8_t mva)** sets the milliVolt per Ampere measured.
- **uint8_t getmVperAmp()** returns the set value.
Typical values see constructor above.
@ -117,8 +124,11 @@ The examples show the basic working of the functions.
## Future
- mA_AC blocks 20 ms so might affect task scheduling on a ESP32.
- mA_AC blocks 20 ms so might affect task scheduling on a ESP32.
This needs to be investigated. Probably need a separate thread that wakes up when new analogRead is available.
- int point2point(uint8_t freq) function for AC. Is part of mA_AC() already. Needs extra global variables?
- float frequency as parameter? Or detect zero crossing to start?
- int point2point(float freq) function for AC. Is part of mA_AC() already.
Needs extra global variables, which are slower than local ones
Or just cache the last p2p value?
- detect zero crossing to start?
- detect frequency?
- external analogue read support? separate class?

6
libraries/ACS712/test/unit_test_001.cpp
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@ -2,8 +2,8 @@
// FILE: unit_test_001.cpp
// AUTHOR: Rob Tillaart
// DATE: 2020-12-06
// PURPOSE: unit tests for the SHT31 temperature and humidity sensor
// https://github.com/RobTillaart/SHT31
// PURPOSE: unit tests for the ACS712 current sensor
// https://github.com/RobTillaart/ACS712
// https://www.adafruit.com/product/2857
// https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
//
@ -20,6 +20,7 @@
// assertFalse(actual)
// assertNull(actual)
#include <ArduinoUnitTests.h>
#include "Arduino.h"
@ -27,6 +28,7 @@
#define A0 0
unittest_setup()
{
}