mirror of https://github.com/arendst/Tasmota.git
144 lines
3.2 KiB
C++
144 lines
3.2 KiB
C++
/*
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xsns_46_MLX90614.ino - Support for MLX ir temperature sensor
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Copyright (C) 2019 Gerhard Mutz and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_MLX90614
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#define XSNS_46 46
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#define I2_ADR_IRT 0x5a
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uint8_t mlx_ready;
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float obj_temp;
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float amb_temp;
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void MLX90614_Init() {
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if (!I2cDevice(I2_ADR_IRT)) {
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return;
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}
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mlx_ready=1;
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// not needed on tasmota
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//Wire.begin();
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//delay(500);
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}
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#define MLX90614_RAWIR1 0x04
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#define MLX90614_RAWIR2 0x05
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#define MLX90614_TA 0x06
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#define MLX90614_TOBJ1 0x07
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#define MLX90614_TOBJ2 0x08
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// return ir temp
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// 0 = chip, 1 = object temperature
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// * 0.02 - 273.15
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uint16_t read_irtmp(uint8_t flag) {
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uint8_t hig,low;
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uint16_t val;
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Wire.beginTransmission(I2_ADR_IRT);
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if (!flag) Wire.write(MLX90614_TA);
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else Wire.write(MLX90614_TOBJ1);
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Wire.endTransmission(false);
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Wire.requestFrom(I2_ADR_IRT, (uint8_t)3);
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low=Wire.read();
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hig=Wire.read();
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Wire.read();
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val=((uint16_t)hig<<8)|low;
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return val;
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}
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void MLX90614_Every_Second(void) {
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if (!mlx_ready) return;
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uint16_t uval=read_irtmp(1);
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if (uval&0x8000) {
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obj_temp=-999;
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} else {
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obj_temp=((float)uval*0.02)-273.15;
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}
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uval=read_irtmp(0);
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if (uval&0x8000) {
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amb_temp=-999;
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} else {
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amb_temp=((float)uval*0.02)-273.15;
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}
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}
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#ifdef USE_WEBSERVER
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const char HTTP_IRTMP[] PROGMEM =
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"{s}MXL90614 " "OBJ-" D_TEMPERATURE "{m}%s C" "{e}"
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"{s}MXL90614 " "AMB-" D_TEMPERATURE "{m}%s C" "{e}";
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void MLX90614_Show(uint8_t json) {
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if (!mlx_ready) return;
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char obj_tstr[16];
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dtostrfd(obj_temp, Settings.flag2.temperature_resolution, obj_tstr);
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char amb_tstr[16];
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dtostrfd(amb_temp, Settings.flag2.temperature_resolution, amb_tstr);
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if (json) {
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ResponseAppend_P(PSTR(",\"MLX90614\":{\"OBJTMP\":%s,\"AMBTMP\":%s}"), obj_tstr,amb_tstr);
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_IRTMP,obj_tstr,amb_tstr);
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#endif
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}
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}
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#endif // USE_WEBSERVER
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns46(byte function)
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{
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bool result = false;
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if (i2c_flg) {
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switch (function) {
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case FUNC_INIT:
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MLX90614_Init();
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break;
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case FUNC_EVERY_SECOND:
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MLX90614_Every_Second();
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break;
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case FUNC_JSON_APPEND:
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MLX90614_Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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MLX90614_Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_MLX90614
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#endif // USE_I2C
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