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Tasmota/sonoff/xsns_13_ina219.ino

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/*
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 <http://www.gnu.org/licenses/>.
*/
#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
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