mirror of https://github.com/arendst/Tasmota.git
155 lines
4.6 KiB
C++
155 lines
4.6 KiB
C++
/*
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xsns_12_ads1115.ino - ADS1x15 A/D Converter support for Tasmota
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Copyright (C) 2019 Stefan Bode and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_ADS1115_I2CDEV
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/*********************************************************************************************\
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* ADS1115 - 4 channel 16BIT A/D converter
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*
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* Required library: https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/ADS1115
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*
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* I2C Address: 0x48, 0x49, 0x4A or 0x4B
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*
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* The ADC input range (or gain) can be changed via the following
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* functions, but be careful never to exceed VDD +0.3V max, or to
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* exceed the upper and lower limits if you adjust the input range!
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* Setting these values incorrectly may destroy your ADC!
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* ADS1015 ADS1115
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* ------- -------
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* ads.setGain(GAIN_TWOTHIRDS); // 2/3x gain +/- 6.144V 1 bit = 3mV 0.1875mV (default)
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* ads.setGain(GAIN_ONE); // 1x gain +/- 4.096V 1 bit = 2mV 0.125mV
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* ads.setGain(GAIN_TWO); // 2x gain +/- 2.048V 1 bit = 1mV 0.0625mV
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* ads.setGain(GAIN_FOUR); // 4x gain +/- 1.024V 1 bit = 0.5mV 0.03125mV
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* ads.setGain(GAIN_EIGHT); // 8x gain +/- 0.512V 1 bit = 0.25mV 0.015625mV
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* ads.setGain(GAIN_SIXTEEN); // 16x gain +/- 0.256V 1 bit = 0.125mV 0.0078125mV
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\*********************************************************************************************/
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#define XSNS_12 12
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#include <ADS1115.h>
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ADS1115 adc0;
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uint8_t ads1115_type = 0;
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uint8_t ads1115_address;
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uint8_t ads1115_addresses[] = {
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ADS1115_ADDRESS_ADDR_GND, // address pin low (GND)
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ADS1115_ADDRESS_ADDR_VDD, // address pin high (VCC)
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ADS1115_ADDRESS_ADDR_SDA, // address pin tied to SDA pin
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ADS1115_ADDRESS_ADDR_SCL // address pin tied to SCL pin
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};
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int16_t Ads1115GetConversion(uint8_t channel)
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{
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switch (channel) {
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case 0:
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adc0.getConversionP0GND();
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break;
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case 1:
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adc0.getConversionP1GND();
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break;
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case 2:
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adc0.getConversionP2GND();
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break;
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case 3:
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adc0.getConversionP3GND();
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break;
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}
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}
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/********************************************************************************************/
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void Ads1115Detect(void)
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{
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if (ads1115_type) {
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return;
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}
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for (uint32_t i = 0; i < sizeof(ads1115_addresses); i++) {
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ads1115_address = ads1115_addresses[i];
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ADS1115 adc0(ads1115_address);
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if (adc0.testConnection()) {
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adc0.initialize();
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adc0.setGain(ADS1115_PGA_6P144); // Set the gain (PGA) +/-6.144V
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adc0.setRate(ADS1115_RATE_860);
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adc0.setMode(ADS1115_MODE_CONTINUOUS);
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ads1115_type = 1;
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AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "ADS1115", ads1115_address);
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break;
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}
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}
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}
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void Ads1115Show(bool json)
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{
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if (ads1115_type) {
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uint8_t dsxflg = 0;
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for (uint32_t i = 0; i < 4; i++) {
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int16_t adc_value = Ads1115GetConversion(i);
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if (json) {
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if (!dsxflg ) {
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ResponseAppend_P(PSTR(",\"ADS1115\":{"));
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}
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ResponseAppend_P(PSTR("%s\"A%d\":%d"), (dsxflg) ? "," : "", i, adc_value);
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dsxflg++;
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_ANALOG, "ADS1115", i, adc_value);
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#endif // USE_WEBSERVER
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}
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}
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if (json) {
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if (dsxflg) {
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ResponseJsonEnd();
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}
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns12(uint8_t function)
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{
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bool result = false;
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if (i2c_flg) {
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switch (function) {
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case FUNC_PREP_BEFORE_TELEPERIOD:
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Ads1115Detect();
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break;
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case FUNC_JSON_APPEND:
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Ads1115Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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Ads1115Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_ADS1115_I2CDEV
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#endif // USE_I2C
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