Tasmota/sonoff/xsns_46_MLX90614.ino

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2019-06-14 14:51:00 +01:00
/*
xsns_46_MLX90614.ino - Support for MLX ir temperature sensor
Copyright (C) 2019 Gerhard Mutz 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
2019-06-14 14:51:00 +01:00
#ifdef USE_MLX90614
#define XSNS_46 46
#define I2_ADR_IRT 0x5a
uint8_t mlx_ready;
float obj_temp;
float amb_temp;
void MLX90614_Init() {
if (!I2cDevice(I2_ADR_IRT)) {
return;
}
mlx_ready=1;
// not needed on tasmota
//Wire.begin();
//delay(500);
}
#define MLX90614_RAWIR1 0x04
#define MLX90614_RAWIR2 0x05
#define MLX90614_TA 0x06
#define MLX90614_TOBJ1 0x07
#define MLX90614_TOBJ2 0x08
// return ir temp
// 0 = chip, 1 = object temperature
// * 0.02 - 273.15
uint16_t read_irtmp(uint8_t flag) {
uint8_t hig,low;
uint16_t val;
Wire.beginTransmission(I2_ADR_IRT);
if (!flag) Wire.write(MLX90614_TA);
else Wire.write(MLX90614_TOBJ1);
Wire.endTransmission(false);
Wire.requestFrom(I2_ADR_IRT, (uint8_t)3);
low=Wire.read();
hig=Wire.read();
Wire.read();
val=((uint16_t)hig<<8)|low;
return val;
}
void MLX90614_Every_Second(void) {
if (!mlx_ready) return;
uint16_t uval=read_irtmp(1);
if (uval&0x8000) {
obj_temp=-999;
} else {
obj_temp=((float)uval*0.02)-273.15;
}
uval=read_irtmp(0);
if (uval&0x8000) {
amb_temp=-999;
} else {
amb_temp=((float)uval*0.02)-273.15;
}
}
#ifdef USE_WEBSERVER
const char HTTP_IRTMP[] PROGMEM =
"{s}MXL90614 " "OBJ-" D_TEMPERATURE "{m}%s C" "{e}"
"{s}MXL90614 " "AMB-" D_TEMPERATURE "{m}%s C" "{e}";
void MLX90614_Show(uint8_t json) {
if (!mlx_ready) return;
char obj_tstr[16];
dtostrfd(obj_temp, Settings.flag2.temperature_resolution, obj_tstr);
char amb_tstr[16];
dtostrfd(amb_temp, Settings.flag2.temperature_resolution, amb_tstr);
if (json) {
ResponseAppend_P(PSTR(",\"MLX90614\":{\"OBJTMP\":%s,\"AMBTMP\":%s}"), obj_tstr,amb_tstr);
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_IRTMP,obj_tstr,amb_tstr);
#endif
}
}
#endif // USE_WEBSERVER
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns46(byte function)
{
bool result = false;
if (i2c_flg) {
switch (function) {
case FUNC_INIT:
MLX90614_Init();
break;
case FUNC_EVERY_SECOND:
MLX90614_Every_Second();
break;
case FUNC_JSON_APPEND:
MLX90614_Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
MLX90614_Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_MLX90614
#endif // USE_I2C