mirror of https://github.com/arendst/Tasmota.git
130 lines
3.3 KiB
C++
130 lines
3.3 KiB
C++
/*
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xsns_58_dht12.ino - DHT12 I2C temperature and humidity sensor support for Tasmota
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Copyright (C) 2020 Stefan Oskamp 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_DHT12
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/*********************************************************************************************\
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* DHT12 - Temperature and Humidity
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*
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* I2C Address: 0x5C
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\*********************************************************************************************/
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#define XSNS_58 58
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#define XI2C_41 41 // See I2CDEVICES.md
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#define DHT12_ADDR 0x5C
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struct DHT12 {
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float temperature = NAN;
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float humidity = NAN;
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uint8_t valid = 0;
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uint8_t count = 0;
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char name[6] = "DHT12";
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} Dht12;
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bool Dht12Read(void)
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{
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if (Dht12.valid) { Dht12.valid--; }
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Wire.beginTransmission(DHT12_ADDR);
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Wire.write(0);
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if (Wire.endTransmission() != 0) { return false; }
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delay(50);
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Wire.requestFrom(DHT12_ADDR, 5);
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delay(5);
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uint8_t humidity = Wire.read();
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uint8_t humidityTenth = Wire.read();
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uint8_t temp = Wire.read();
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uint8_t tempTenth = Wire.read();
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uint8_t checksum = Wire.read();
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Dht12.humidity = ConvertHumidity( (float) humidity + (float) humidityTenth/(float) 10.0 );
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Dht12.temperature = ConvertTemp( (float) temp + (float) tempTenth/(float) 10.0 );
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if (isnan(Dht12.temperature) || isnan(Dht12.humidity)) { return false; }
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Dht12.valid = SENSOR_MAX_MISS;
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return true;
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}
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/********************************************************************************************/
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void Dht12Detect(void)
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{
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if (I2cActive(DHT12_ADDR)) { return; }
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if (Dht12Read()) {
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I2cSetActiveFound(DHT12_ADDR, Dht12.name);
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Dht12.count = 1;
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}
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}
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void Dht12EverySecond(void)
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{
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if (uptime &1) {
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// DHT12: 55mS
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if (!Dht12Read()) {
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AddLogMissed(Dht12.name, Dht12.valid);
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}
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}
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}
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void Dht12Show(bool json)
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{
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if (Dht12.valid) {
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TempHumDewShow(json, (0 == tele_period), Dht12.name, Dht12.temperature, Dht12.humidity);
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns58(uint8_t function)
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{
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if (!I2cEnabled(XI2C_41)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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Dht12Detect();
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}
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else if (Dht12.count) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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Dht12EverySecond();
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break;
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case FUNC_JSON_APPEND:
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Dht12Show(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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Dht12Show(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_DHT12
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#endif // USE_I2C
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