/* xsns_13_ina219.ino - INA219 Current Sensor support for Sonoff-Tasmota Copyright (C) 2017 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_INA219 /*********************************************************************************************\ * INA219 - Low voltage (max 32V!) Current sensor * * Source: Adafruit Industries * * I2C Address: 0x40, 0x41 0x44 or 0x45 \*********************************************************************************************/ #define INA219_ADDRESS1 (0x40) // 1000000 (A0+A1=GND) #define INA219_ADDRESS2 (0x41) // 1000000 (A0=Vcc, A1=GND) #define INA219_ADDRESS3 (0x44) // 1000000 (A0=GND, A1=Vcc) #define INA219_ADDRESS4 (0x45) // 1000000 (A0+A1=Vcc) #define INA219_READ (0x01) #define INA219_REG_CONFIG (0x00) #define INA219_CONFIG_RESET (0x8000) // Reset Bit #define INA219_CONFIG_BVOLTAGERANGE_MASK (0x2000) // Bus Voltage Range Mask #define INA219_CONFIG_BVOLTAGERANGE_16V (0x0000) // 0-16V Range #define INA219_CONFIG_BVOLTAGERANGE_32V (0x2000) // 0-32V Range #define INA219_CONFIG_GAIN_MASK (0x1800) // Gain Mask #define INA219_CONFIG_GAIN_1_40MV (0x0000) // Gain 1, 40mV Range #define INA219_CONFIG_GAIN_2_80MV (0x0800) // Gain 2, 80mV Range #define INA219_CONFIG_GAIN_4_160MV (0x1000) // Gain 4, 160mV Range #define INA219_CONFIG_GAIN_8_320MV (0x1800) // Gain 8, 320mV Range #define INA219_CONFIG_BADCRES_MASK (0x0780) // Bus ADC Resolution Mask #define INA219_CONFIG_BADCRES_9BIT (0x0080) // 9-bit bus res = 0..511 #define INA219_CONFIG_BADCRES_10BIT (0x0100) // 10-bit bus res = 0..1023 #define INA219_CONFIG_BADCRES_11BIT (0x0200) // 11-bit bus res = 0..2047 #define INA219_CONFIG_BADCRES_12BIT (0x0400) // 12-bit bus res = 0..4097 #define INA219_CONFIG_SADCRES_MASK (0x0078) // Shunt ADC Resolution and Averaging Mask #define INA219_CONFIG_SADCRES_9BIT_1S_84US (0x0000) // 1 x 9-bit shunt sample #define INA219_CONFIG_SADCRES_10BIT_1S_148US (0x0008) // 1 x 10-bit shunt sample #define INA219_CONFIG_SADCRES_11BIT_1S_276US (0x0010) // 1 x 11-bit shunt sample #define INA219_CONFIG_SADCRES_12BIT_1S_532US (0x0018) // 1 x 12-bit shunt sample #define INA219_CONFIG_SADCRES_12BIT_2S_1060US (0x0048) // 2 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_4S_2130US (0x0050) // 4 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_8S_4260US (0x0058) // 8 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_16S_8510US (0x0060) // 16 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_32S_17MS (0x0068) // 32 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_64S_34MS (0x0070) // 64 x 12-bit shunt samples averaged together #define INA219_CONFIG_SADCRES_12BIT_128S_69MS (0x0078) // 128 x 12-bit shunt samples averaged together #define INA219_CONFIG_MODE_MASK (0x0007) // Operating Mode Mask #define INA219_CONFIG_MODE_POWERDOWN (0x0000) #define INA219_CONFIG_MODE_SVOLT_TRIGGERED (0x0001) #define INA219_CONFIG_MODE_BVOLT_TRIGGERED (0x0002) #define INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED (0x0003) #define INA219_CONFIG_MODE_ADCOFF (0x0004) #define INA219_CONFIG_MODE_SVOLT_CONTINUOUS (0x0005) #define INA219_CONFIG_MODE_BVOLT_CONTINUOUS (0x0006) #define INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS (0x0007) #define INA219_REG_SHUNTVOLTAGE (0x01) #define INA219_REG_BUSVOLTAGE (0x02) #define INA219_REG_POWER (0x03) #define INA219_REG_CURRENT (0x04) #define INA219_REG_CALIBRATION (0x05) uint8_t ina219_type = 0; uint8_t ina219_address; uint8_t ina219_addresses[] = { INA219_ADDRESS1, INA219_ADDRESS2, INA219_ADDRESS3, INA219_ADDRESS4 }; uint32_t ina219_cal_value = 0; // The following multiplier is used to convert raw current values to mA, taking into account the current config settings uint32_t ina219_current_divider_ma = 0; bool Ina219SetCalibration(uint8_t mode) { uint16_t config = 0; switch (mode &3) { case 0: // 32V 2A case 3: ina219_cal_value = 4096; ina219_current_divider_ma = 10; // Current LSB = 100uA per bit (1000/100 = 10) config = INA219_CONFIG_BVOLTAGERANGE_32V | INA219_CONFIG_GAIN_8_320MV | INA219_CONFIG_BADCRES_12BIT | INA219_CONFIG_SADCRES_12BIT_1S_532US | INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS; break; case 1: // 32V 1A ina219_cal_value = 10240; ina219_current_divider_ma = 25; // Current LSB = 40uA per bit (1000/40 = 25) config |= INA219_CONFIG_BVOLTAGERANGE_32V | INA219_CONFIG_GAIN_8_320MV | INA219_CONFIG_BADCRES_12BIT | INA219_CONFIG_SADCRES_12BIT_1S_532US | INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS; break; case 2: // 16V 0.4A ina219_cal_value = 8192; ina219_current_divider_ma = 20; // Current LSB = 50uA per bit (1000/50 = 20) config |= INA219_CONFIG_BVOLTAGERANGE_16V | INA219_CONFIG_GAIN_1_40MV | INA219_CONFIG_BADCRES_12BIT | INA219_CONFIG_SADCRES_12BIT_1S_532US | INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS; break; } // Set Calibration register to 'Cal' calculated above bool success = I2cWrite16(ina219_address, INA219_REG_CALIBRATION, ina219_cal_value); if (success) { // Set Config register to take into account the settings above I2cWrite16(ina219_address, INA219_REG_CONFIG, config); } return success; } float Ina219GetShuntVoltage_mV() { // raw shunt voltage (16-bit signed integer, so +-32767) int16_t value = I2cReadS16(ina219_address, INA219_REG_SHUNTVOLTAGE); // shunt voltage in mV (so +-327mV) return value * 0.01; } float Ina219GetBusVoltage_V() { // Shift to the right 3 to drop CNVR and OVF and multiply by LSB // raw bus voltage (16-bit signed integer, so +-32767) int16_t value = (int16_t)(((uint16_t)I2cReadS16(ina219_address, INA219_REG_BUSVOLTAGE) >> 3) * 4); // bus voltage in volts return value * 0.001; } float Ina219GetCurrent_mA() { // Sometimes a sharp load will reset the INA219, which will reset the cal register, // meaning CURRENT and POWER will not be available ... avoid this by always setting // a cal value even if it's an unfortunate extra step I2cWrite16(ina219_address, INA219_REG_CALIBRATION, ina219_cal_value); // Now we can safely read the CURRENT register! // raw current value (16-bit signed integer, so +-32767) float value = I2cReadS16(ina219_address, INA219_REG_CURRENT); value /= ina219_current_divider_ma; // current value in mA, taking into account the config settings and current LSB return value; } /********************************************************************************************/ void Ina219Detect() { if (ina219_type) { return; } for (byte i = 0; i < sizeof(ina219_addresses); i++) { ina219_address = ina219_addresses[i]; if (Ina219SetCalibration(Settings.ina219_mode)) { ina219_type = 1; break; } } if (ina219_type) { snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "INA219", ina219_address); AddLog(LOG_LEVEL_DEBUG); } } #ifdef USE_WEBSERVER const char HTTP_SNS_INA219_DATA[] PROGMEM = "%s" "{s}INA219 " D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}" "{s}INA219 " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}" "{s}INA219 " D_POWERUSAGE "{m}%s " D_UNIT_WATT "{e}"; #endif // USE_WEBSERVER void Ina219Show(boolean json) { if (ina219_type) { char voltage[10]; char current[10]; char power[10]; float fvoltage = Ina219GetBusVoltage_V() + (Ina219GetShuntVoltage_mV() / 1000); float fcurrent = Ina219GetCurrent_mA() / 1000; float fpower = fvoltage * fcurrent; dtostrfd(fvoltage, Settings.flag2.voltage_resolution, voltage); dtostrfd(fpower, Settings.flag2.wattage_resolution, power); dtostrfd(fcurrent, Settings.flag2.current_resolution, current); if (json) { snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"INA219\":{\"" D_VOLTAGE "\":%s,\"" D_CURRENT "\":%s,\"" D_POWERUSAGE "\":%s}"), mqtt_data, voltage, current, power); #ifdef USE_DOMOTICZ DomoticzSensor(DZ_VOLTAGE, voltage); DomoticzSensor(DZ_CURRENT, current); #endif // USE_DOMOTICZ #ifdef USE_WEBSERVER } else { snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_INA219_DATA, mqtt_data, voltage, current, power); #endif // USE_WEBSERVER } } } /*********************************************************************************************\ * Interface \*********************************************************************************************/ #define XSNS_13 boolean Xsns13(byte function) { boolean result = false; if (i2c_flg) { switch (function) { // case FUNC_XSNS_INIT: // break; case FUNC_XSNS_PREP: Ina219Detect(); break; case FUNC_XSNS_JSON_APPEND: Ina219Show(1); break; #ifdef USE_WEBSERVER case FUNC_XSNS_WEB: Ina219Show(0); break; #endif // USE_WEBSERVER } } return result; } #endif // USE_INA219 #endif // USE_I2C