mirror of https://github.com/arendst/Tasmota.git
307 lines
7.7 KiB
C++
307 lines
7.7 KiB
C++
/*
|
|
xsns_08_htu21.ino - HTU21 temperature and humidity sensor support for Sonoff-Tasmota
|
|
|
|
Copyright (C) 2018 Heiko Krupp 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_HTU
|
|
/*********************************************************************************************\
|
|
* HTU21 - Temperature and Humidy
|
|
*
|
|
* Source: Heiko Krupp
|
|
*
|
|
* I2C Address: 0x40
|
|
\*********************************************************************************************/
|
|
|
|
#define HTU21_ADDR 0x40
|
|
|
|
#define SI7013_CHIPID 0x0D
|
|
#define SI7020_CHIPID 0x14
|
|
#define SI7021_CHIPID 0x15
|
|
#define HTU21_CHIPID 0x32
|
|
|
|
#define HTU21_READTEMP 0xE3
|
|
#define HTU21_READHUM 0xE5
|
|
#define HTU21_WRITEREG 0xE6
|
|
#define HTU21_READREG 0xE7
|
|
#define HTU21_RESET 0xFE
|
|
#define HTU21_HEATER_WRITE 0x51
|
|
#define HTU21_HEATER_READ 0x11
|
|
#define HTU21_SERIAL2_READ1 0xFC /* Read 3rd two Serial bytes */
|
|
#define HTU21_SERIAL2_READ2 0xC9 /* Read 4th two Serial bytes */
|
|
|
|
#define HTU21_HEATER_ON 0x04
|
|
#define HTU21_HEATER_OFF 0xFB
|
|
|
|
#define HTU21_RES_RH12_T14 0x00 // Default
|
|
#define HTU21_RES_RH8_T12 0x01
|
|
#define HTU21_RES_RH10_T13 0x80
|
|
#define HTU21_RES_RH11_T11 0x81
|
|
|
|
#define HTU21_CRC8_POLYNOM 0x13100
|
|
|
|
const char kHtuTypes[] PROGMEM = "HTU21|SI7013|SI7020|SI7021|T/RH?";
|
|
|
|
uint8_t htu_address;
|
|
uint8_t htu_type = 0;
|
|
uint8_t delay_temp;
|
|
uint8_t delay_humidity = 50;
|
|
char htu_types[7];
|
|
|
|
uint8_t HtuCheckCrc8(uint16_t data)
|
|
{
|
|
for (uint8_t bit = 0; bit < 16; bit++) {
|
|
if (data & 0x8000) {
|
|
data = (data << 1) ^ HTU21_CRC8_POLYNOM;
|
|
} else {
|
|
data <<= 1;
|
|
}
|
|
}
|
|
return data >>= 8;
|
|
}
|
|
|
|
uint8_t HtuReadDeviceId(void)
|
|
{
|
|
uint16_t deviceID = 0;
|
|
uint8_t checksum = 0;
|
|
|
|
Wire.beginTransmission(HTU21_ADDR);
|
|
Wire.write(HTU21_SERIAL2_READ1);
|
|
Wire.write(HTU21_SERIAL2_READ2);
|
|
Wire.endTransmission();
|
|
|
|
Wire.requestFrom(HTU21_ADDR, 3);
|
|
deviceID = Wire.read() << 8;
|
|
deviceID |= Wire.read();
|
|
checksum = Wire.read();
|
|
if (HtuCheckCrc8(deviceID) == checksum) {
|
|
deviceID = deviceID >> 8;
|
|
} else {
|
|
deviceID = 0;
|
|
}
|
|
return (uint8_t)deviceID;
|
|
}
|
|
|
|
void HtuSetResolution(uint8_t resolution)
|
|
{
|
|
uint8_t current = I2cRead8(HTU21_ADDR, HTU21_READREG);
|
|
current &= 0x7E; // Replace current resolution bits with 0
|
|
current |= resolution; // Add new resolution bits to register
|
|
I2cWrite8(HTU21_ADDR, HTU21_WRITEREG, current);
|
|
}
|
|
|
|
void HtuReset(void)
|
|
{
|
|
Wire.beginTransmission(HTU21_ADDR);
|
|
Wire.write(HTU21_RESET);
|
|
Wire.endTransmission();
|
|
delay(15); // Reset takes 15ms
|
|
}
|
|
|
|
void HtuHeater(uint8_t heater)
|
|
{
|
|
uint8_t current = I2cRead8(HTU21_ADDR, HTU21_READREG);
|
|
|
|
switch(heater)
|
|
{
|
|
case HTU21_HEATER_ON : current |= heater;
|
|
break;
|
|
case HTU21_HEATER_OFF : current &= heater;
|
|
break;
|
|
default : current &= heater;
|
|
break;
|
|
}
|
|
I2cWrite8(HTU21_ADDR, HTU21_WRITEREG, current);
|
|
}
|
|
|
|
void HtuInit()
|
|
{
|
|
HtuReset();
|
|
HtuHeater(HTU21_HEATER_OFF);
|
|
HtuSetResolution(HTU21_RES_RH12_T14);
|
|
}
|
|
|
|
float HtuReadHumidity(void)
|
|
{
|
|
uint8_t checksum = 0;
|
|
uint16_t sensorval = 0;
|
|
float humidity = 0.0;
|
|
|
|
Wire.beginTransmission(HTU21_ADDR);
|
|
Wire.write(HTU21_READHUM);
|
|
if (Wire.endTransmission() != 0) {
|
|
return 0.0; // In case of error
|
|
}
|
|
delay(delay_humidity); // Sensor time at max resolution
|
|
|
|
Wire.requestFrom(HTU21_ADDR, 3);
|
|
if (3 <= Wire.available()) {
|
|
sensorval = Wire.read() << 8; // MSB
|
|
sensorval |= Wire.read(); // LSB
|
|
checksum = Wire.read();
|
|
}
|
|
if (HtuCheckCrc8(sensorval) != checksum) {
|
|
return 0.0; // Checksum mismatch
|
|
}
|
|
|
|
sensorval ^= 0x02; // clear status bits
|
|
humidity = 0.001907 * (float)sensorval - 6;
|
|
|
|
if (humidity > 100) {
|
|
return 100.0;
|
|
}
|
|
if (humidity < 0) {
|
|
return 0.01;
|
|
}
|
|
|
|
return humidity;
|
|
}
|
|
|
|
float HtuReadTemperature()
|
|
{
|
|
uint8_t checksum=0;
|
|
uint16_t sensorval=0;
|
|
float t;
|
|
|
|
Wire.beginTransmission(HTU21_ADDR);
|
|
Wire.write(HTU21_READTEMP);
|
|
if (Wire.endTransmission() != 0) {
|
|
return 0.0; // In case of error
|
|
}
|
|
delay(delay_temp); // Sensor time at max resolution
|
|
|
|
Wire.requestFrom(HTU21_ADDR, 3);
|
|
if (3 == Wire.available()) {
|
|
sensorval = Wire.read() << 8; // MSB
|
|
sensorval |= Wire.read(); // LSB
|
|
checksum = Wire.read();
|
|
}
|
|
if (HtuCheckCrc8(sensorval) != checksum) {
|
|
return 0.0; // Checksum mismatch
|
|
}
|
|
|
|
t = ConvertTemp(0.002681 * (float)sensorval - 46.85);
|
|
return t;
|
|
}
|
|
|
|
float HtuCompensatedHumidity(float humidity, float temperature)
|
|
{
|
|
if(humidity == 0.00 && temperature == 0.00) {
|
|
return 0.0;
|
|
}
|
|
if(temperature > 0.00 && temperature < 80.00) {
|
|
return (-0.15)*(25-temperature)+humidity;
|
|
}
|
|
return humidity;
|
|
}
|
|
|
|
/********************************************************************************************/
|
|
|
|
void HtuDetect()
|
|
{
|
|
if (htu_type) {
|
|
return;
|
|
}
|
|
|
|
htu_address = HTU21_ADDR;
|
|
htu_type = HtuReadDeviceId();
|
|
if (htu_type) {
|
|
uint8_t index = 0;
|
|
HtuInit();
|
|
switch (htu_type) {
|
|
case HTU21_CHIPID:
|
|
delay_temp = 50;
|
|
delay_humidity = 16;
|
|
break;
|
|
case SI7021_CHIPID:
|
|
index++; // 3
|
|
case SI7020_CHIPID:
|
|
index++; // 2
|
|
case SI7013_CHIPID:
|
|
index++; // 1
|
|
delay_temp = 12;
|
|
delay_humidity = 23;
|
|
break;
|
|
default:
|
|
index = 4;
|
|
delay_temp = 50;
|
|
delay_humidity = 23;
|
|
}
|
|
GetTextIndexed(htu_types, sizeof(htu_types), index, kHtuTypes);
|
|
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, htu_types, htu_address);
|
|
AddLog(LOG_LEVEL_DEBUG);
|
|
}
|
|
}
|
|
|
|
void HtuShow(boolean json)
|
|
{
|
|
if (htu_type) {
|
|
char temperature[10];
|
|
char humidity[10];
|
|
|
|
float t = HtuReadTemperature();
|
|
float h = HtuReadHumidity();
|
|
h = HtuCompensatedHumidity(h, t);
|
|
dtostrfd(t, Settings.flag2.temperature_resolution, temperature);
|
|
dtostrfd(h, Settings.flag2.humidity_resolution, humidity);
|
|
|
|
if (json) {
|
|
snprintf_P(mqtt_data, sizeof(mqtt_data), JSON_SNS_TEMPHUM, mqtt_data, htu_types, temperature, humidity);
|
|
#ifdef USE_DOMOTICZ
|
|
DomoticzTempHumSensor(temperature, humidity);
|
|
#endif // USE_DOMOTICZ
|
|
#ifdef USE_WEBSERVER
|
|
} else {
|
|
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, htu_types, temperature, TempUnit());
|
|
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, htu_types, humidity);
|
|
#endif // USE_WEBSERVER
|
|
}
|
|
}
|
|
}
|
|
|
|
/*********************************************************************************************\
|
|
* Interface
|
|
\*********************************************************************************************/
|
|
|
|
#define XSNS_08
|
|
|
|
boolean Xsns08(byte function)
|
|
{
|
|
boolean result = false;
|
|
|
|
if (i2c_flg) {
|
|
switch (function) {
|
|
case FUNC_PREP_BEFORE_TELEPERIOD:
|
|
HtuDetect();
|
|
break;
|
|
case FUNC_JSON_APPEND:
|
|
HtuShow(1);
|
|
break;
|
|
#ifdef USE_WEBSERVER
|
|
case FUNC_WEB_APPEND:
|
|
HtuShow(0);
|
|
break;
|
|
#endif // USE_WEBSERVER
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif // USE_HTU
|
|
#endif // USE_I2C
|
|
|