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0.4.3 ADS1x15

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2
libraries/ADS1x15/ADS1X15.cpp
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@ -1,7 +1,7 @@
//
// FILE: ADS1X15.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.4.2
// VERSION: 0.4.3
// 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: 0.4.2
// VERSION: 0.4.3
// 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("0.4.2"))
#define ADS1X15_LIB_VERSION (F("0.4.3"))
// allow compile time default address
// address in { 0x48, 0x49, 0x4A, 0x4B }, no test...
@ -123,6 +123,7 @@ public:
int8_t getError();
// EXPERIMENTAL
// see https://github.com/RobTillaart/ADS1X15/issues/22
void setWireClock(uint32_t clockSpeed = 100000);

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libraries/ADS1x15/CHANGELOG.md
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@ -1,10 +1,15 @@
# Change Log
# Change Log ADS1x15
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).
## [0.4.3] - 2024-06-25
- Fix #74, ALERT/RDY pin documentation
- update readme.md
- minor edits examples
## [0.4.2] - 2024-03-04
- fix #68, gain bugs ADS1x13
- add unit test for ADS1x13
@ -12,7 +17,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
- removed depreciated **getLastValue()**
- add multiplexer section to readme.md
## [0.4.1] - 2024-01-02
- fix some typos
- minor edits

120
libraries/ADS1x15/README.md
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@ -22,40 +22,62 @@ you can check similar library [here](https://github.com/chandrawi/ADS1x15-ADC).
This library should work for the devices mentioned below,
although not all sensors support all functionality.
| Device | Channels | Resolution | Max sps | Comparator | ProgGainAMP | Notes |
|:---------:|:----------:|:------------:|:---------:|:------------:|:-------------:|:---------|
| ADS1013 | 1 | 12 | 3300 | N | N | |
| ADS1014 | 1 | 12 | 3300 | Y | Y | |
| ADS1015 | 4 | 12 | 3300 | Y | Y | |
| ADS1113 | 1 | 16 | 860 | N | N | |
| ADS1114 | 1 | 16 | 860 | Y | Y | |
| ADS1115 | 4 | 16 | 860 | Y | Y | Tested |
| Device | Channels | Resolution | Max sps | Comparator | Interrupts | ProgGainAMP | Notes |
|:---------:|:----------:|:------------:|:---------:|:------------:|:------------:|:-------------:|:---------|
| ADS1013 | 1 | 12 | 3300 | N | N | N | |
| ADS1014 | 1 | 12 | 3300 | Y | Y | Y | |
| ADS1015 | 4 | 12 | 3300 | Y | Y | Y | |
| ADS1113 | 1 | 16 | 860 | N | N | N | |
| ADS1114 | 1 | 16 | 860 | Y | Y | Y | |
| ADS1115 | 4 | 16 | 860 | Y | Y | Y | Tested |
As the ADS1015 and the ADS1115 are both 4 channels these are the most
interesting from functionality point of view as these can also do
interesting from functionality point of view as these can do
differential measurements.
#### Interrupts
Besides polling the ADS1x14 and ADS1x15 support interrupts to maximize throughput
with minimal latency. For this these device has an ALERT/RDY pin.
This pin can be used both for interrupts or polling, see table of examples below.
| example | Interrupts | notes |
|:---------------------------------:|:------------:|:-------:|
| ADS_1114_two_continuous.ino | Y |
| ADS_continuous_3_channel.ino | Y |
| ADS_continuous_4_channel.ino | Y |
| ADS_continuous_8_channel.ino | Y |
| ADS_continuous_differential.ino | Y |
| ADS_high_speed_differential.ino | Y |
| ADS_read_async_rdy.ino | polling |
| ADS_read_RDY.ino | polling |
#### 0.4.0 Breaking change
Version 0.4.0 introduced a breaking change.
You cannot set the pins in **begin()** any more.
This reduces the dependency of processor dependent Wire implementations.
The user has to call **Wire.begin()** and can optionally set the Wire pins
This reduces the dependency of processor dependent Wire / I2C implementations.
The user has to call **Wire.begin()** and can optionally set the I2C pins
before calling **begin()**.
#### Related
- https://github.com/RobTillaart/MCP_ADC (10 & 12 bit ADC, SPI, fast)
- https://github.com/RobTillaart/PCF8591 (8 bit ADC + 1 bit DAC)
- https://github.com/RobTillaart/ADC081S 10-12 bit, single channel ADC
- https://github.com/RobTillaart/ADC08XS 10-12 bit, 2 + 4 channel ADC
- https://gammon.com.au/adc tutorial about ADC's (UNO specific)
- https://github.com/RobTillaart/MCP_ADC 10-12 bit, 1,2,4,8 channel ADC
- https://github.com/RobTillaart/ADS1x15
- https://github.com/RobTillaart/PCF8591 8 bit single ADC (+ 1 bit DAC)
## I2C Address
The address of the ADS1113/4/5 is determined by to which pin the **ADDR**
is connected to:
The I2C address of the ADS1113 /14 /15 is determined by to which pin
the **ADDR** is connected to:
| ADDR pin connected to | Address | Notes |
|:-----------------------:|:---------:|:---------:|
@ -108,10 +130,11 @@ and optional the Wire interface as parameter.
and optional the Wire interface as parameter.
After construction the **ADS.begin()** need to be called. This will return false
if an invalid address is used.
The function **bool isConnected()** can be used to verify the reading of the ADS.
The function **void reset()** is sets the parameters to their initial value as
After construction the **ADS.begin()** must be called, typical in **setup()**.
- **bool begin()** Returns false if an invalid address is used.
- **bool isConnected()** is used to check if the device address is visible on I2C.
- **void reset()** sets the internal parameters to their initial value as
in the constructor.
For example.
@ -122,9 +145,15 @@ For example.
// initialize ADS1115 on I2C bus 1 with default address 0x48
ADS1115 ADS(0x48);
void begin() {
if (!ADS.isConnected()) {
// error ADS1115 not connected
void setup()
{
if (!ADS.begin())
{
// invalid address ADS1115 or 0x48 not found
}
if (!ADS.isConnected())
{
// address 0x48 not found
}
}
```
@ -133,7 +162,7 @@ void begin() {
#### 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.
in Hz of the used I2C interface. Typical value is 100 KHz.
The function **uint32_t getWireClock()** is a prototype.
It returns the value set by setWireClock().
@ -177,7 +206,7 @@ Check the [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples
```cpp
float f = ADS.toVoltage();
ADS.setComparatorThresholdLow( 3.0 / f );
ADS.setComparatorThresholdLow( 4.3 / f );
ADS.setComparatorThresholdHigh( 4.3 / f );
```
@ -185,6 +214,7 @@ Check the [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples
The ADS sensor can operate in single shot or continuous mode.
Depending on how often conversions needed you can tune the mode.
- **void setMode(uint8_t mode)** 0 = CONTINUOUS, 1 = SINGLE (default)
Note: the mode is not set in the device until an explicit read/request of the ADC (any read call will do).
- **uint8_t getMode()** returns current mode 0 or 1, or ADS1X15_INVALID_MODE = 0xFE.
@ -219,9 +249,10 @@ Data rate in samples per second, based on datasheet is described on table below.
Reading the ADC is very straightforward, the **readADC()** function handles all in one call.
Under the hood it uses the asynchronous calls.
- **int16_t readADC(uint8_t pin = 0)** normal ADC functionality, pin = 0..3.
If the pin number is out of range, this function will return 0.
Default pin = 0 as this is convenient for 1 channel devices.
If the pin number is out of range, this function will return 0 (seems safest).
Default pin = 0 as this is convenient for the single channel devices.
```cpp
// read ADC in pin 2
@ -235,6 +266,7 @@ ADS.readADC(0);
See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_minimum/ADS_minimum.ino).
To read the ADC in an asynchronous way (e.g. to minimize blocking) you need call three functions:
- **void requestADC(uint8_t pin = 0)** Start the conversion. pin = 0..3.
Default pin = 0 as this is convenient for 1 channel devices.
- **bool isBusy()** Is the conversion not ready yet? Works only in SINGLE mode!
@ -242,7 +274,8 @@ Default pin = 0 as this is convenient for 1 channel devices.
- **int16_t getValue()** Read the result of the conversion.
in terms of code
in terms of code:
```cpp
void setup()
{
@ -328,6 +361,7 @@ one of the two single pin values.
#### ReadADC continuous mode
To use the continuous mode you need call three functions:
- **void setMode(0)** 0 = CONTINUOUS, 1 = SINGLE (default).
Note: the mode is not set in the device until an explicit read/request of the ADC (any read call will do).
- **int16_t readADC(uint8_t pin)** or **void requestADC(uint8_t pin)** to get the continuous mode started.
@ -336,13 +370,15 @@ Note this can be a different pin, so be warned.
Calling this over and over again can give the same value multiple times.
```cpp
void setup() {
void setup()
{
// configuration things here
ADS.setMode(ADS.MODE_CONTINUOUS);
ADS.requestADC(0); // request on pin 0
}
void loop() {
void loop()
{
value = ADS.getValue()
sleep(1)
}
@ -381,7 +417,14 @@ This explicit stop takes extra time, however it should prevent "incorrect" readi
#### Threshold registers
If the thresholdHigh is set to 0x0100 and the thresholdLow to 0x0000
(datasheet 9.3.8)
_Conversion Ready Pin (ADS1114 and ADS1115 Only)
The ALERT/RDY pin can also be configured as a conversion ready pin. Set the most-significant bit of the
Hi_thresh register to 1 and the most-significant bit of Lo_thresh register to 0 to enable the pin as a conversion
ready pin._
If the thresholdHigh is set to 0x8000 and the thresholdLow to 0x0000
the **ALERT/RDY** pin is triggered when a conversion is ready.
- **void setComparatorThresholdLow(int16_t lo)** writes value to device directly.
@ -443,15 +486,15 @@ even if actual value has been 'restored to normal' value.
#### QueConvert
Set the number of conversions before trigger activates.
The **void setComparatorQueConvert(uint8_t mode)** is used to set the number of
conversions that exceed the threshold before the **ALERT/RDY** pin is set **HIGH**.
A value of 3 (or above) effectively disables the comparator. See table below.
To enable the conversion-ready function of the ALERT/RDY pin, it is necessary to set the MSB of the Hi_thresh register to 1 and the MSB of the Lo_thresh register to 0.
See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_continuous_differential/ADS_continuous_differential.ino).
- **void setComparatorQueConvert(uint8_t mode)** See table below.
- **uint8_t getComparatorQueConvert()** returns value set.
- **uint8_t getComparatorQueConvert()** returns the value set.
| value | meaning | Notes |
|:-------:|:------------------------------------|:----------|
@ -459,6 +502,12 @@ See [examples](https://github.com/RobTillaart/ADS1X15/blob/master/examples/ADS_c
| 1 | trigger alert after 2 conversions | |
| 2 | trigger alert after 4 conversions | |
| 3 | Disable comparator | default |
| other | Disable comparator | |
To enable the conversion-ready function of the **ALERT/RDY** pin,
it is necessary to set the MSB of the Hi_threshold register to 1 (value 0x8000)
and the MSB of the Lo_threshold register to 0.
See section **Threshold registers** above.
#### Threshold registers comparator mode
@ -477,23 +526,26 @@ mean something different see - Comparator Mode above or datasheet.
#### Must
- Improve documentation (always)
- split off separate topics?
#### Should
- 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.
#### Could
- some **void** functions could return **bool** to be more informative?
- More examples
- SMB alert command (00011001) on I2C bus?
- sync order .h / .cpp
#### Wont (unless requested)
- type flag?
- constructor for ADS1X15? No as all types are supported.
## Support
If you appreciate my libraries, you can support the development and maintenance.

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libraries/ADS1x15/examples/ADS_high_speed_differential/ADS_high_speed_differential.ino
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@ -1,5 +1,5 @@
//
// FILE: ADS_high_speed_differential.ino.ino
// FILE: ADS_high_speed_differential.ino
// AUTHOR: Rob.Tillaart
// PURPOSE: read from 2 IC's for high speed differential
// interrupt driven to catch all conversions.

2
libraries/ADS1x15/examples/ADS_read_RDY/ADS_read_RDY.ino
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@ -15,7 +15,7 @@
// EXPERIMENTAL
//
// The RDY pin (or ALERT Pin) is triggered when conversion is ready
// The ALERT/RDY pin is triggered when threshold is exceeded.
//

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libraries/ADS1x15/examples/ADS_read_async/ADS_read_async.ino
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@ -18,6 +18,9 @@
ADS1115 ADS(0x48);
float f = 0;
int16_t val_0;
uint32_t start, stop;
void setup()
@ -26,12 +29,27 @@ void setup()
Serial.println(__FILE__);
Serial.print("ADS1X15_LIB_VERSION: ");
Serial.println(ADS1X15_LIB_VERSION);
delay(100);
Wire.begin();
Wire.setClock(100000);
ADS.begin();
ADS.setGain(0);
f = ADS.toVoltage(); // voltage factor
start = micros();
ADS.requestADC(0);
stop = micros();
Serial.println(stop - start);
delay(100);
while (ADS.isBusy());
start = micros();
val_0 = ADS.getValue();
stop = micros();
Serial.println(stop - start);
delay(100);
ADS.requestADC(0);
}
@ -40,7 +58,7 @@ void loop()
{
if (ADS.isBusy() == false)
{
int16_t val_0 = ADS.getValue();
val_0 = ADS.getValue();
// request a new one
ADS.requestADC(0);
Serial.print("\tAnalog0: ");

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libraries/ADS1x15/examples/ADS_read_async_rdy/ADS_read_async_rdy.ino
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@ -15,14 +15,14 @@
// EXPERIMENTAL
//
// The RDY pin (or ALERT Pin) is triggered when conversion is ready
// The ALERT/RDY pin is triggered when threshold is exceeded.
//
#include "ADS1X15.h"
ADS1115 ADS(0x48);
float f = 0;
float factor = 0;
void setup()
@ -39,10 +39,10 @@ void setup()
// select slow so the led blinks visible for the eye.
ADS.setDataRate(0); // 0 = slow 4 = medium 7 = fast
f = ADS.toVoltage(); // voltage factor
factor = ADS.toVoltage(); // voltage factor
ADS.requestADC(0);
// set the thresholds to Trigger RDY pin
// set the thresholds to trigger ALERT/RDY pin when exceeded.
ADS.setComparatorThresholdLow(0x0000);
ADS.setComparatorThresholdHigh(0x0200);
ADS.setComparatorQueConvert(0); // enable RDY pin !!
@ -54,13 +54,15 @@ void loop()
{
if (ADS.isReady())
{
int16_t val_0 = ADS.getValue();
// request a new one
// read the value.
int16_t value0 = ADS.getValue();
// request a new one.
ADS.requestADC(0);
// process the read value.
Serial.print("\tAnalog0: ");
Serial.print(val_0);
Serial.print(value0);
Serial.print('\t');
Serial.println(val_0 * f, 3);
Serial.println(value0 * factor, 3);
}
// simulate other tasks...
delay(2000);

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libraries/ADS1x15/examples/ADS_read_comparator_1/ADS_read_comparator_1.ino
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@ -15,8 +15,8 @@
//
// GND ---[LED]---[ALERT_PIN]---[ R ]--- 5V
//
// Connect a LED (+ resistor) to ALERT PIN
// and see it trigger at configured way by the comparator.
// Connect a LED (+ resistor) to ALERT/RDY pin
// and see it triggered by the comparator in the configured way.
//
@ -51,9 +51,9 @@ void setup()
// ADS.setComparatorThresholdHigh(20000); // change if needed
// set the threshold as a voltage by using the voltage factor.
float f = ADS.toVoltage(1); // voltage factor
ADS.setComparatorThresholdLow(1.234 / f); // convert volts to number needed
ADS.setComparatorThresholdHigh(3.142 / f); // convert volts to number needed
float factor = ADS.toVoltage(1); // voltage factor
ADS.setComparatorThresholdLow(1.234 / factor); // convert volts to number needed
ADS.setComparatorThresholdHigh(3.142 / factor); // convert volts to number needed
Serial.println(ADS.getComparatorThresholdLow());
Serial.println(ADS.getComparatorThresholdHigh());
@ -64,18 +64,18 @@ void loop()
{
ADS.setGain(0);
int16_t val_0 = ADS.readADC(0);
int16_t value0 = ADS.readADC(0);
float f = ADS.toVoltage(1); // voltage factor
float factor = ADS.toVoltage(1); // voltage factor
Serial.print("\tAnalog0: ");
Serial.print(val_0);
Serial.print(value0);
Serial.print('\t');
Serial.print(val_0 * f, 3);
Serial.print(value0 * factor, 3);
Serial.print('\t');
Serial.print(ADS.getComparatorThresholdLow() * f, 3);
Serial.print(ADS.getComparatorThresholdLow() * factor, 3);
Serial.print('\t');
Serial.print(ADS.getComparatorThresholdHigh() * f, 3);
Serial.print(ADS.getComparatorThresholdHigh() * factor, 3);
Serial.println();
delay(100);

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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": "0.4.2",
"version": "0.4.3",
"license": "MIT",
"frameworks": "*",
"platforms": "*",

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libraries/ADS1x15/library.properties
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@ -1,5 +1,5 @@
name=ADS1X15
version=0.4.2
version=0.4.3
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