mirror of https://github.com/arendst/Tasmota.git
135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
/*
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xsns_14_sht3x.ino - SHT3X temperature and humidity sensor support for Sonoff-Tasmota
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Copyright (C) 2018 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_SHT3X
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/*********************************************************************************************\
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* SHT3X - Temperature and Humidy
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*
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* I2C Address: 0x44 or 0x45
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\*********************************************************************************************/
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#define SHT3X_ADDR_GND 0x44 // address pin low (GND)
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#define SHT3X_ADDR_VDD 0x45 // address pin high (VDD)
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uint8_t sht3x_type = 0;
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uint8_t sht3x_address;
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uint8_t sht3x_addresses[] = { SHT3X_ADDR_GND, SHT3X_ADDR_VDD };
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bool Sht3xRead(float &t, float &h)
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{
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unsigned int data[6];
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t = NAN;
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h = NAN;
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Wire.beginTransmission(sht3x_address);
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Wire.write(0x2C); // Enable clock stretching
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Wire.write(0x06); // High repeatability
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if (Wire.endTransmission() != 0) { // Stop I2C transmission
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return false;
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}
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delay(30); // Timing verified with logic analyzer (10 is to short)
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Wire.requestFrom(sht3x_address, (uint8_t)6); // Request 6 bytes of data
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for (int i = 0; i < 6; i++) {
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data[i] = Wire.read(); // cTemp msb, cTemp lsb, cTemp crc, humidity msb, humidity lsb, humidity crc
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};
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t = ConvertTemp((float)((((data[0] << 8) | data[1]) * 175) / 65535.0) - 45);
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h = (float)((((data[3] << 8) | data[4]) * 100) / 65535.0);
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return (!isnan(t) && !isnan(h));
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}
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/********************************************************************************************/
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void Sht3xDetect()
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{
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if (sht3x_type) {
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return;
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}
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float t;
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float h;
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sht3x_type = 1;
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for (byte i = 0; i < sizeof(sht3x_addresses); i++) {
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sht3x_address = sht3x_addresses[i];
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if (Sht3xRead(t, h)) {
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snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "SHT3X", sht3x_address);
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AddLog(LOG_LEVEL_DEBUG);
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return;
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}
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}
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sht3x_type = 0;
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}
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void Sht3xShow(boolean json)
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{
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if (sht3x_type) {
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float t;
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float h;
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if (Sht3xRead(t, h)) {
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char temperature[10];
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char humidity[10];
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dtostrfd(t, Settings.flag2.temperature_resolution, temperature);
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dtostrfd(h, Settings.flag2.humidity_resolution, humidity);
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if (json) {
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snprintf_P(mqtt_data, sizeof(mqtt_data), JSON_SNS_TEMPHUM, mqtt_data, "SHT3X", temperature, humidity);
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#ifdef USE_DOMOTICZ
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DomoticzTempHumSensor(temperature, humidity);
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "SHT3X", temperature, TempUnit());
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snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, "SHT3X", humidity);
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#endif // USE_WEBSERVER
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}
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}
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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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#define XSNS_14
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boolean Xsns14(byte function)
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{
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boolean 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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Sht3xDetect();
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break;
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case FUNC_JSON_APPEND:
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Sht3xShow(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_APPEND:
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Sht3xShow(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_SHT3X
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#endif // USE_I2C
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