Tasmota/tasmota/xsns_55_hih_series.ino

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/*
xsns_55_hih_series.ino - Honeywell HIH series temperature and humidity sensor support for Tasmota
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Copyright (C) 2020 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_HIH6
/*********************************************************************************************\
* HIH6130 - Temperature and Humidity
*
* https://sensing.honeywell.com/HIH6130-021-001-humidity-sensors
* https://sensing.honeywell.com/i2c-comms-humidicon-tn-009061-2-en-final-07jun12.pdf
* https://sensing.honeywell.com/command-mode-humidicon-tn-009062-3-en-final-07jun12.pdf
* https://github.com/ControlEverythingCommunity/HIH6130/blob/master/Arduino/HIH6130.ino
*
* I2C Address: 0x27
\*********************************************************************************************/
#define XSNS_55 55
#define XI2C_36 36 // See I2CDEVICES.md
#define HIH6_ADDR 0x27
struct HIH6 {
float temperature = 0;
float humidity = 0;
uint8_t valid = 0;
uint8_t type = 0;
char types[4] = "HIH";
} Hih6;
bool Hih6Read(void)
{
Wire.beginTransmission(HIH6_ADDR);
if (Wire.endTransmission() != 0) { return false; } // In case of error
delay(40); // Wait for Valid data (Stale data doesn't work. See #6808)
uint8_t data[4];
Wire.requestFrom(HIH6_ADDR, 4);
if (4 == Wire.available()) {
data[0] = Wire.read(); // Status and Humidity msb
data[1] = Wire.read(); // Humidity lsb
data[2] = Wire.read(); // Temp msb
data[3] = Wire.read(); // Temp lsb
} else { return false; }
// uint8_t status = data[0] >> 6; // 0 = Valid data, 1 = Stale data, 2 = Command mode, 3 = Not used
Hih6.humidity = ConvertHumidity(((float)(((data[0] & 0x3F) << 8) | data[1]) * 100.0) / 16383.0);
// Convert the data to 14-bits
int temp = ((data[2] << 8) | (data[3] & 0xFC)) / 4;
Hih6.temperature = ConvertTemp(((float)temp / 16384.0) * 165.0 - 40.0);
Hih6.valid = SENSOR_MAX_MISS;
return true;
}
/********************************************************************************************/
void Hih6Detect(void)
{
if (I2cActive(HIH6_ADDR)) { return; }
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if (TasmotaGlobal.uptime < 2) { delay(20); } // Skip entering power on comand mode
Hih6.type = Hih6Read();
if (Hih6.type) {
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I2cSetActiveFound(HIH6_ADDR, Hih6.types);
}
}
void Hih6EverySecond(void)
{
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if (TasmotaGlobal.uptime &1) {
// HIH6130: 30mS
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if (!Hih6Read()) {
AddLogMissed(Hih6.types, Hih6.valid);
}
}
}
void Hih6Show(bool json)
{
if (Hih6.valid) {
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TempHumDewShow(json, (0 == TasmotaGlobal.tele_period), Hih6.types, Hih6.temperature, Hih6.humidity);
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns55(uint8_t function)
{
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if (!I2cEnabled(XI2C_36)) { return false; }
bool result = false;
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if (FUNC_INIT == function) {
Hih6Detect();
}
else if (Hih6.type) {
switch (function) {
case FUNC_EVERY_SECOND:
Hih6EverySecond();
break;
case FUNC_JSON_APPEND:
Hih6Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Hih6Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_HIH6
#endif // USE_I2C