Tasmota/tasmota/xsns_12_ads1115_i2cdev.ino

155 lines
4.6 KiB
C++

/*
xsns_12_ads1115.ino - ADS1x15 A/D Converter support for 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 <http://www.gnu.org/licenses/>.
*/
#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.h>
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 (uint32_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 (uint32_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