From 6cf1d6c155792968f55601cd027cf7042dbb6b38 Mon Sep 17 00:00:00 2001 From: "Wolfgang (Wolle) Ewald" Date: Thu, 18 Feb 2021 23:27:58 +0100 Subject: Add files via upload --- .../Conv_Ready_Alert_Pin_Controlled.ino | 150 +++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 examples/Conv_Ready_Alert_Pin_Controlled/Conv_Ready_Alert_Pin_Controlled.ino diff --git a/examples/Conv_Ready_Alert_Pin_Controlled/Conv_Ready_Alert_Pin_Controlled.ino b/examples/Conv_Ready_Alert_Pin_Controlled/Conv_Ready_Alert_Pin_Controlled.ino new file mode 100644 index 0000000..282d7cb --- /dev/null +++ b/examples/Conv_Ready_Alert_Pin_Controlled/Conv_Ready_Alert_Pin_Controlled.ino @@ -0,0 +1,150 @@ +/*************************************************************************** +* Example sketch for the ADS1115_WE library +* +* This sketch shows how you can use the alert pin as conversion ready alert pin. +* It works in continuous mode as well as in single shot mode. +* Please note that you need to enable the alert pin with setAlertPinMode. Choose any +* parameter except ADS1115_DISABLE_ALERT. +* +* 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 +#include +#define I2C_ADDRESS 0x48 +int interruptPin = 2; +volatile bool convReady = false; + +ADS1115_WE adc(I2C_ADDRESS); +// ADS1115_WE adc = ADS1115_WE(); // Alternative: uses default address 0x48 + +void setup() { + Wire.begin(); + Serial.begin(9600); + pinMode(interruptPin, INPUT_PULLUP); + 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 channels + + /* Set number of conversions out of limit after which the alert pin will assert + * - or you can disable the alert (including conversion ready 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); //needed in this sketch to enable alert pin (doesn't matter if you choose after 1,2 or 4) + + /* 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_8_SPS); //comment line/change parameter to change SPS + + /* Set continuous or single shot mode: + * + * ADS1115_CONTINUOUS -> continuous mode + * ADS1115_SINGLE -> single shot mode (default) + */ + //adc.setMeasureMode(ADS1115_CONTINUOUS); // the conversion ready alert pin also works in continuous mode + + /* Choose maximum limit or maximum and minimum alert limit (window) in volts - 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 assert, when a conversion is ready. + * In order to deactivate, use the setAlertLimit_V function + */ + adc.setAlertPinToConversionReady(); //needed for this sketch + + Serial.println("ADS1115 Example Sketch - Single Shot, Conversion Ready Alert Pin controlled"); + Serial.println(); + attachInterrupt(digitalPinToInterrupt(interruptPin), convReadyAlert, FALLING); + adc.startSingleMeasurement(); +} + + /* In this example I measure 32 times before the result is output. This is only to slow down + * the output rate. I want to show that the output rate is controlled by the conversion ready + * signals and not by a delay. + */ +void loop() { + float voltage = 0.0; + static int counter = 0; + if(convReady){ + counter++; + convReady = false; + if(counter==32){ // counter is 32, conversion rate is 8 SPS --> 4s + voltage = adc.getResult_V(); // alternative: getResult_mV for Millivolt + Serial.print("Channel 0 vs GND [V]: "); + Serial.println(voltage); + Serial.println("-------------------------------"); + counter = 0; + } + adc.startSingleMeasurement(); + } +} + +void convReadyAlert(){ + convReady = true; +} -- cgit v1.2.3