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