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/***************************************************************************
* Example sketch for the ADS1115_WE library
*
* This sketch shows how to use the Auto Range function of the AD1115_WE library.
*
* Further information can be found on:
* https://wolles-elektronikkiste.de/ads1115 (German)
* https://wolles-elektronikkiste.de/en/ads1115-a-d-converter-with-amplifier (English)
*
***************************************************************************/
#include<ADS1115_WE.h>
#include<Wire.h>
#define I2C_ADDRESS 0x48
/* There are several ways to create your ADS1115_WE object:
* ADS1115_WE adc = ADS1115_WE() -> uses Wire / I2C Address = 0x48
* ADS1115_WE adc = ADS1115_WE(I2C_ADDRESS) -> uses Wire / I2C_ADDRESS
* ADS1115_WE adc = ADS1115_WE(&wire2) -> uses the TwoWire object wire2 / I2C_ADDRESS
* ADS1115_WE adc = ADS1115_WE(&wire2, I2C_ADDRESS) -> all together
* Successfully tested with two I2C busses on an ESP32
*/
ADS1115_WE adc = ADS1115_WE(I2C_ADDRESS);
void setup() {
Wire.begin();
Serial.begin(9600);
if(!adc.init()){
Serial.println("ADS1115 not connected!");
}
/* Set the voltage range of the ADC to adjust the gain
* Please note that you must not apply more than VDD + 0.3V to the input pins!
*
* ADS1115_RANGE_6144 -> +/- 6144 mV
* ADS1115_RANGE_4096 -> +/- 4096 mV
* ADS1115_RANGE_2048 -> +/- 2048 mV (default)
* ADS1115_RANGE_1024 -> +/- 1024 mV
* ADS1115_RANGE_0512 -> +/- 512 mV
* ADS1115_RANGE_0256 -> +/- 256 mV
*/
adc.setVoltageRange_mV(ADS1115_RANGE_6144); //comment line/change parameter to change range
/* Set the inputs to be compared
*
* ADS1115_COMP_0_1 -> compares 0 with 1 (default)
* ADS1115_COMP_0_3 -> compares 0 with 3
* ADS1115_COMP_1_3 -> compares 1 with 3
* ADS1115_COMP_2_3 -> compares 2 with 3
* ADS1115_COMP_0_GND -> compares 0 with GND
* ADS1115_COMP_1_GND -> compares 1 with GND
* ADS1115_COMP_2_GND -> compares 2 with GND
* ADS1115_COMP_3_GND -> compares 3 with GND
*/
adc.setCompareChannels(ADS1115_COMP_0_GND); //comment line/change parameter to change channel
/* Set number of conversions after which the alert pin asserts
* - or you can disable the alert
*
* ADS1115_ASSERT_AFTER_1 -> after 1 conversion
* ADS1115_ASSERT_AFTER_2 -> after 2 conversions
* ADS1115_ASSERT_AFTER_4 -> after 4 conversions
* ADS1115_DISABLE_ALERT -> disable comparator / alert pin (default)
*/
//adc.setAlertPinMode(ADS1115_ASSERT_AFTER_1); //uncomment if you want to change the default
/* Set the conversion rate in SPS (samples per second)
* Options should be self-explaining:
*
* ADS1115_8_SPS
* ADS1115_16_SPS
* ADS1115_32_SPS
* ADS1115_64_SPS
* ADS1115_128_SPS (default)
* ADS1115_250_SPS
* ADS1115_475_SPS
* ADS1115_860_SPS
*/
adc.setConvRate(ADS1115_64_SPS); //uncomment if you want to change the default
/* Set continuous or single shot mode:
*
* ADS1115_CONTINUOUS -> continuous mode
* ADS1115_SINGLE -> single shot mode (default)
*/
adc.setMeasureMode(ADS1115_CONTINUOUS); //comment line/change parameter to change mode
/* Choose maximum limit or maximum and minimum alert limit (window) in Volt - alert pin will
* assert when measured values are beyond the maximum limit or outside the window
* Upper limit first: setAlertLimit_V(MODE, maximum, minimum)
* In max limit mode the minimum value is the limit where the alert pin assertion will be
* cleared (if not latched)
*
* ADS1115_MAX_LIMIT
* ADS1115_WINDOW
*
*/
//adc.setAlertModeAndLimit_V(ADS1115_MAX_LIMIT, 3.0, 1.5); //uncomment if you want to change the default
/* Enable or disable latch. If latch is enabled the alert pin will assert until the
* conversion register is read (getResult functions). If disabled the alert pin assertion will be
* cleared with next value within limits.
*
* ADS1115_LATCH_DISABLED (default)
* ADS1115_LATCH_ENABLED
*/
//adc.setAlertLatch(ADS1115_LATCH_ENABLED); //uncomment if you want to change the default
/* Sets the alert pin polarity if active:
*
* ADS1115_ACT_LOW -> active low (default)
* ADS1115_ACT_HIGH -> active high
*/
//adc.setAlertPol(ADS1115_ACT_LOW); //uncomment if you want to change the default
/* With this function the alert pin will assert, when a conversion is ready.
* In order to deactivate, use the setAlertLimit_V function
*/
//adc.setAlertPinToConversionReady(); //uncomment if you want to change the default
/* Enable or disable permanent automatic range selection mode. If enabled, the range will
* change if the measured values are outside of 30-80% of the maximum value of the current
* range.
* !!! Use EITHER this function once OR setAutoRange() whenever needed (see below) !!!
*/
adc.setPermanentAutoRangeMode(true);
Serial.println("ADS1115 Example Sketch - Continuous Mode with Auto Range");
Serial.println();
}
void loop() {
float voltage = 0.0;
Serial.print("Channel 0 - ");
voltage = readChannel(ADS1115_COMP_0_GND);
Serial.println(voltage);
Serial.print("Channel 1 - ");
voltage = readChannel(ADS1115_COMP_1_GND);
Serial.println(voltage);
Serial.print("Channel 2 - ");
voltage = readChannel(ADS1115_COMP_2_GND);
Serial.println(voltage);
Serial.print("Channel 3 - ");
voltage = readChannel(ADS1115_COMP_3_GND);
Serial.println(voltage);
Serial.println("-------------------------------");
delay(1000);
}
float readChannel(ADS1115_MUX channel) {
float voltage = 0.0;
adc.setCompareChannels(channel);
/* setAutoRange() switches to the highest range (+/- 6144 mV), measures the current
* voltage and then switches to the lowest range where the current value is still
* below 80% of the maximum value of the range. The function is only suitable if you
* expect stable or slowly changing voltages. setAutoRange needs roughly the time you
* would need for three conversions.
* If the ADS115 is in single shot mode, setAutoRange() will switch into continuous
* mode to measure a value and switch back again.
* !!! Use EITHER this function whenever needed OR setPermanentAutoRangeMode(true) once !!!
*/
//adc.setAutoRange();
adc.getResult_mV();
printVoltageRange(); // this is just to show that the range is changing with changing voltages
voltage = adc.getResult_V(); // alternative: getResult_mV for Millivolt
return voltage;
}
void printVoltageRange(){
unsigned int voltageRange = adc.getVoltageRange_mV();
Serial.print("Range: ");
switch(voltageRange){
case 6144:
Serial.print("+/- 6144 mV, Voltage [mV]: ");
break;
case 4096:
Serial.print("+/- 4096 mV, Voltage [mV]: ");
break;
case 2048:
Serial.print("+/- 2048 mV, Voltage [mV]: ");
break;
case 1024:
Serial.print("+/- 1024 mV, Voltage [mV]: ");
break;
case 512:
Serial.print("+/- 512 mV, Voltage [mV]: ");
break;
case 256:
Serial.print("+/- 256 mV, Voltage [mV]: ");
break;
default:
Serial.println("Something went wrong");
}
}
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