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0.4.4 ADS1x15

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Rob Tillaart 2024-06-30 08:22:55 +02:00
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2
libraries/ADS1x15/ADS1X15.cpp
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@ -1,7 +1,7 @@
//
// FILE: ADS1X15.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.4.3
// VERSION: 0.4.4
// DATE: 2013-03-24
// PURPOSE: Arduino library for ADS1015 and ADS1115
// URL: https://github.com/RobTillaart/ADS1X15

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libraries/ADS1x15/ADS1X15.h
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@ -2,7 +2,7 @@
//
// FILE: ADS1X15.h
// AUTHOR: Rob Tillaart
// VERSION: 0.4.3
// VERSION: 0.4.4
// DATE: 2013-03-24
// PURPOSE: Arduino library for ADS1015 and ADS1115
// URL: https://github.com/RobTillaart/ADS1X15
@ -12,7 +12,7 @@
#include "Arduino.h"
#include "Wire.h"
#define ADS1X15_LIB_VERSION (F("0.4.3"))
#define ADS1X15_LIB_VERSION (F("0.4.4"))
// allow compile time default address
// address in { 0x48, 0x49, 0x4A, 0x4B }, no test...
@ -31,6 +31,26 @@
#define ADS1X15_INVALID_MODE 0xFE
// PARAMETER CONSTANTS NOT USED IN CODE YET
// enum ?
#define ADS1X15_GAIN_6144MV 0x00
#define ADS1X15_GAIN_4096MV 0x01
#define ADS1X15_GAIN_2048MV 0x02
#define ADS1X15_GAIN_1024MV 0x04
#define ADS1X15_GAIN_0512MV 0x08
#define ADS1X15_GAIN_0256MV 0x10
#define ADS1x15_COMP_MODE_TRADITIONAL 0x00
#define ADS1x15_COMP_MODE_WINDOW 0x01
#define ADS1x15_COMP_POL_FALLING_EDGE 0x00
#define ADS1x15_COMP_POL_RISING_EDGE 0x01
#define ADS1x15_COMP_POL_LATCH 0x00
#define ADS1x15_COMP_POL_NOLATCH 0x01
class ADS1X15
{
public:

5
libraries/ADS1x15/CHANGELOG.md
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@ -5,6 +5,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).
## [0.4.4] - 2024-06-28
- Fix #76, update readme.md Comparator Polarity
- added defines to replace magic numbers (not used in code yet)
- minor edits
## [0.4.3] - 2024-06-25
- Fix #74, ALERT/RDY pin documentation
- update readme.md

102
libraries/ADS1x15/README.md
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@ -37,7 +37,7 @@ interesting from functionality point of view as these can do
differential measurements.
#### Interrupts
### Interrupts
Besides polling the ADS1x14 and ADS1x15 support interrupts to maximize throughput
with minimal latency. For this these device has an ALERT/RDY pin.
@ -55,7 +55,7 @@ This pin can be used both for interrupts or polling, see table of examples below
| ADS_read_RDY.ino | polling |
#### 0.4.0 Breaking change
### 0.4.0 Breaking change
Version 0.4.0 introduced a breaking change.
You cannot set the pins in **begin()** any more.
@ -64,7 +64,7 @@ The user has to call **Wire.begin()** and can optionally set the I2C pins
before calling **begin()**.
#### Related
### Related
- https://github.com/RobTillaart/ADC081S 10-12 bit, single channel ADC
- https://github.com/RobTillaart/ADC08XS 10-12 bit, 2 + 4 channel ADC
@ -87,7 +87,7 @@ the **ADDR** is connected to:
| SCL | 0x4B | |
#### I2C multiplexing
### I2C multiplexing
Sometimes you need to control more devices than possible with the default
address range the device provides.
@ -111,7 +111,7 @@ too if they are behind the multiplexer.
#include "ADS1X15.h"
```
#### Initializing
### Initializing
To initialize the library you must call a constructor as described below.
@ -159,7 +159,7 @@ For example.
```
#### I2C clock speed
### I2C clock speed
The function **void setWireClock(uint32_t speed = 100000)** is used to set the clock speed
in Hz of the used I2C interface. Typical value is 100 KHz.
@ -176,7 +176,7 @@ See - https://github.com/arduino/Arduino/issues/11457
Question: Should this functionality be in this library?
#### Programmable Gain
### Programmable Gain
- **void setGain(uint8_t gain)** set the gain value, indicating the maxVoltage that can be measured
Adjusting the gain allowing to make more precise measurements.
@ -210,7 +210,7 @@ Check the [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples
```
#### Operational mode
### Operational mode
The ADS sensor can operate in single shot or continuous mode.
Depending on how often conversions needed you can tune the mode.
@ -220,7 +220,7 @@ Note: the mode is not set in the device until an explicit read/request of the AD
- **uint8_t getMode()** returns current mode 0 or 1, or ADS1X15_INVALID_MODE = 0xFE.
#### Data rate
### Data rate
- **void setDataRate(uint8_t dataRate)** Data rate depends on type of device.
For all devices the index 0..7 can be used, see table below.
@ -245,7 +245,7 @@ Data rate in samples per second, based on datasheet is described on table below.
| 7 | 3300 | 860 | fastest |
#### ReadADC Single mode
### ReadADC Single mode
Reading the ADC is very straightforward, the **readADC()** function handles all in one call.
Under the hood it uses the asynchronous calls.
@ -297,7 +297,7 @@ in terms of code:
See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_read_async/ADS_read_async.ino).
#### ReadADC Differential
### ReadADC Differential
For reading the ADC in a differential way there are 4 calls possible.
@ -326,7 +326,7 @@ After one of these calls you need to call
See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_differential/ADS_differential.ino).
#### lastRequestMode
### lastRequestMode
Since 0.3.12 the library tracks the last request mode, single pin or differential.
This variable is set at the moment of request, and keeps its value until a new
@ -358,7 +358,7 @@ As these are emulated in software by two single pin calls, the state would be
one of the two single pin values.
#### ReadADC continuous mode
### ReadADC continuous mode
To use the continuous mode you need call three functions:
@ -394,7 +394,7 @@ Instead you can configure the threshold registers to allow the **ALERT/RDY**
pin to trigger an interrupt signal when conversion data ready.
#### Switching mode or channel during continuous mode
### Switching mode or channel during continuous mode
When switching the operating mode or the ADC channel in continuous mode, be aware that
the device will always finish the running conversion.
@ -415,7 +415,7 @@ This explicit stop takes extra time, however it should prevent "incorrect" readi
(need to be verified with different models)
#### Threshold registers
### Threshold registers
(datasheet 9.3.8)
_Conversion Ready Pin (ADS1114 and ADS1115 Only)
@ -435,7 +435,7 @@ the **ALERT/RDY** pin is triggered when a conversion is ready.
See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_read_RDY/ADS_read_RDY.ino).
#### Comparator
### Comparator
Please read Page 15 of the datasheet as the behaviour of the
comparator is not trivial.
@ -444,7 +444,7 @@ NOTE: all comparator settings are copied to the device only after calling
**readADC()** or **requestADC()** functions.
#### Comparator Mode
### Comparator Mode
When configured as a **TRADITIONAL** comparator, the **ALERT/RDY** pin asserts
(active low by default) when conversion data exceed the limit set in the
@ -465,16 +465,61 @@ the high threshold register or falls below the low threshold register.
In this mode the alert is held if the **LATCH** is set. This is similar as above.
#### Polarity
### Polarity
Default state of the **ALERT/RDY** pin is **LOW**, can be to set **HIGH**.
Default state of the **ALERT/RDY** pin is **LOW**, which can be to set **HIGH**.
- **void setComparatorPolarity(uint8_t pol)**
Flag is only explicitly set after a **readADC()** or a **requestADC()**
- **uint8_t getComparatorPolarity()** returns value set.
#### Latch
From tests (#76) it became clear that the behaviour of the **ALERT/RDY** pin is a bit ambiguous.
The meaning of HIGH LOW is different for **continuous** and **single** mode, see
the table below. Also different is the timing of the pulse at the **ALERT/RDY** pin.
See **ADS_COMP_POL.ino**.
Timing of pulse from a synchronous ```ADS.readADC(0)``` call.
| TEST | MODE | COMP_POL | ALERT/RDY PIN | Notes |
|:----:|:-----------------|:-----------|:------------------------------|:--------|
| 1 | 0 = continuous | 0 = LOW | LOW with 8 us HIGH pulse | as specified in datasheet
| 2 | 0 = continuous | 1 = HIGH | HIGH with 8 us LOW pulse | as specified in datasheet
| 3 | 1 = single | 0 = LOW | HIGH with an 8 ms LOW pulse | depends on data rate
| 4 | 1 = single | 1 = HIGH | LOW with an 8 ms HIGH pulse | depends on data rate
See issue #76 for some screenshots.
#### Effect Data Rate
| data rate | pulse length | Notes |
|:-----------:|:--------------:|:-------:|
| 0 | 125 ms |
| 1 | 62 ms |
| 2 | 32 ms |
| 3 | 16 ms |
| 4 | 8 ms | default, see in table above.
| 5 | 4.4 ms |
| 6 | 2.4 ms |
| 7 | 1.2 ms |
Times are estimates from scope.
#### Conclusions
- Conversion always generates a pulse.
- The length of the pulse in continuous mode and in single mode differs.
- In single shot mode the length of the pulse indicates the conversion time.
- In continuous mode the pulse indicates the end of conversion.
- The polarity in single mode seems to have an inverted pulse, however it is
not about the pulse, it is about the edge.
- If COMP_POL = 0, a FALLING edge indicates conversion ready.
- If COMP_POL = 1, a RISING edge indicates conversion ready.
### Latch
Holds the **ALERT/RDY** to **HIGH** (or **LOW** depending on polarity) after triggered
even if actual value has been 'restored to normal' value.
@ -482,8 +527,10 @@ even if actual value has been 'restored to normal' value.
- **void setComparatorLatch(uint8_t latch)** 0 = NO LATCH, not 0 = LATCH
- **uint8_t getComparatorLatch()** returns value set.
The (no-)latch is not verified in detail yet.
#### QueConvert
### QueConvert
Set the number of conversions before trigger activates.
@ -510,7 +557,7 @@ and the MSB of the Lo_threshold register to 0.
See section **Threshold registers** above.
#### Threshold registers comparator mode
### Threshold registers comparator mode
Depending on the comparator mode **TRADITIONAL** or **WINDOW** the thresholds registers
mean something different see - Comparator Mode above or datasheet.
@ -530,21 +577,20 @@ mean something different see - Comparator Mode above or datasheet.
#### Should
- remove the experimental **getWireClock()** as this is not really a library function
- Remove the experimental **getWireClock()** as this is not really a library function
but a responsibility of the I2C library.
- investigate ADS1118 library which should be a similar SPI based ADC.
- Investigate ADS1118 library which should be a similar SPI based ADC.
#### Could
- some **void** functions could return **bool** to be more informative?
- More examples
- SMB alert command (00011001) on I2C bus?
- sync order .h / .cpp
- Sync code order .h / .cpp
#### Wont (unless requested)
- type flag?
- constructor for ADS1X15? No as all types are supported.
- Type flag?
- Constructor for ADS1X15? No as all types are supported.
## Support

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libraries/ADS1x15/examples/ADS_COMP_POL/ADS_COMP_POL.ino Normal file
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@ -0,0 +1,61 @@
//
// FILE: ADS_COMP_POL.ino
// AUTHOR: Rob.Tillaart
// PURPOSE: read analog input
// URL: https://github.com/RobTillaart/ADS1X15/issues/76
#include "ADS1X15.h"
// choose your sensor
// ADS1013 ADS(0x48);
// ADS1014 ADS(0x48);
// ADS1015 ADS(0x48);
// ADS1113 ADS(0x48);
// ADS1114 ADS(0x48);
ADS1115 ADS(0x48);
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("ADS1X15_LIB_VERSION: ");
Serial.println(ADS1X15_LIB_VERSION);
Wire.begin();
ADS.begin();
ADS.setGain(0); // 6.144 volt
ADS.setDataRate(4); // 0..7
// test polarity
// data rate 4 (default)
// MODE COMP_POL ALERT/RDY PIN
// 0 = continuous 0 = LOW LOW with 8 us HIGH PULSE
// 0 = continuous 1 = HIGH HIGH with 8 us LOW pulse
// 1 = single 0 = LOW HIGH with 8 ms LOW pulse
// 1 = single 1 = HIGH LOW with 8 ms HIGH pulse
ADS.setMode(1);
ADS.setComparatorPolarity(1);
// enable ALERT/RDY pin
ADS.setComparatorThresholdHigh(0x8000);
ADS.setComparatorThresholdLow(0x0000);
ADS.setComparatorQueConvert(0);
// activate settings
ADS.requestADC(0);
Serial.println("Voltage");
delay(1000);
}
void loop()
{
// comment all in loop() to get a single pulse
int16_t raw = ADS.readADC(0);
delay(1000);
Serial.println(ADS.toVoltage(raw), 3);
delay(1000);
}
// -- END OF FILE --

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libraries/ADS1x15/examples/ADS_performance/ADS_performance.ino
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@ -4,6 +4,8 @@
// PURPOSE: read analog input
// URL: https://github.com/RobTillaart/ADS1X15
// TODO verify output
// test
// connect 1 potmeter
//
@ -39,7 +41,7 @@ void setup()
Serial.println(ADS1X15_LIB_VERSION);
Wire.begin();
Wire.setClock(100000);
Wire.setClock(600000);
ADS.begin();
ADS.setGain(0); // 6.144 volt
@ -108,4 +110,3 @@ void test_continuous()
// -- END OF FILE --

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libraries/ADS1x15/examples/ADS_performance/performance_0.4.4.md Normal file
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@ -0,0 +1,50 @@
Based upon output of **ADS_performance.ino** (indicative).
UNO 16 MHz.
IDE 1.8.19
ADS1X15_LIB_VERSION: 0.4.4
Synchronous calls I2C **100 KHz**
| DataRate | Time 100 calls | SPS |
|:----------:|:----------------:|:------:|
| 0 | 12931840 | 7.73 |
| 1 | 6481444 | 15.4 |
| 2 | 3347556 | 29.9 |
| 3 | 1724492 | 58.0 |
| 4 | 940984 | 106 |
| 5 | 549268 | 182 |
| 6 | 381328 | 262 |
| 7 | 269400 | 371 |
Synchronous calls I2C **400 KHz**
| DataRate | Time 100 calls | SPS |
|:----------:|:----------------:|:------:|
| 0 | 12824560 | 7.80 |
| 1 | 6377516 | 15.7 |
| 2 | 3224972 | 31.0 |
| 3 | 1649100 | 60.6 |
| 4 | 862148 | 116 |
| 5 | 468488 | 213 |
| 6 | 271568 | 368 |
| 7 | 173424 | 577 |
Synchronous calls I2C **600 KHz**
| DataRate | Time 100 calls | SPS |
|:----------:|:----------------:|:------:|
| 0 | 12816404 | 7.80 |
| 1 | 6374432 | 15.7 |
| 2 | 3216720 | 31.1 |
| 3 | 1630428 | 61.3 |
| 4 | 852332 | 117 |
| 5 | 448396 | 223 |
| 6 | 261288 | 383 |
| 7 | 165688 | 603 |
These are maxima of the SPS feasible, they do not include further processing.
At least this test shows the effect of the I2C bus speed.

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libraries/ADS1x15/keywords.txt
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@ -68,6 +68,20 @@ ADS1X15_LIB_VERSION LITERAL1
ADS1X15_INVALID_VOLTAGE LITERAL1
ADS1X15_INVALID_GAIN LITERAL1
ADS1X15_INVALID_MODE LITERAL1
ADS1015_ADDRESS LITERAL1
ADS1115_ADDRESS LITERAL1
ADS1X15_GAIN_6144MV LITERAL1
ADS1X15_GAIN_4096MV LITERAL1
ADS1X15_GAIN_2048MV LITERAL1
ADS1X15_GAIN_1024MV LITERAL1
ADS1X15_GAIN_0512MV LITERAL1
ADS1X15_GAIN_0256MV LITERAL1
ADS1x15_COMP_MODE_TRADITIONAL LITERAL1
ADS1x15_COMP_MODE_WINDOW LITERAL1
ADS1x15_COMP_POL_FALLING_EDGE LITERAL1
ADS1x15_COMP_POL_RISING_EDGE LITERAL1

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libraries/ADS1x15/library.json
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@ -15,7 +15,7 @@
"type": "git",
"url": "https://github.com/RobTillaart/ADS1X15"
},
"version": "0.4.3",
"version": "0.4.4",
"license": "MIT",
"frameworks": "*",
"platforms": "*",

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libraries/ADS1x15/library.properties
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@ -1,5 +1,5 @@
name=ADS1X15
version=0.4.3
version=0.4.4
author=Rob Tillaart <rob.tillaart@gmail.com>
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
sentence=Arduino library for ADS1015 - I2C 12 bit ADC and ADS1115 I2C 16 bit ADC