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Updated Sonoff TH (markdown)

blakadder 2019-11-03 23:33:50 +01:00
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Sonoff-TH.md

@ -19,7 +19,7 @@ Length of the wire is approximately 47cm apart from DS18b20 sensor that comes wi
**NOTE!!!** **NOTE!!!**
Normally a Si7021 sensor is an I<sup>2</sup>C device. The Sonoff labelled Si7021 sensor is BASED on an Si7021, but, to make this sensor plug'n'play on a Sonoff TH an 8-bit MCU is added on the board. This changes the I<sup>2</sup>C communication of an Si7021 sensor to one-wire communication! That is why a "Sonoff SI7021 sensor" doesn't work in combination with a I<sup>2</sup>C library. Normally a Si7021 sensor is an I<sup>2</sup>C device. The Sonoff labelled Si7021 sensor is BASED on an Si7021, but, to make this sensor plug'n'play on a Sonoff TH an 8-bit MCU is added on the board. This changes the I<sup>2</sup>C communication of an Si7021 sensor to one-wire communication! That is why a "Sonoff SI7021 sensor" doesn't work in combination with a I<sup>2</sup>C library.
Tasmota supports Sonoff TH with all three Sonoff sensors. Just select module **Sonoff TH (4)** and under GPIO14 configure the sensor you have connected. Tasmota supports Sonoff TH with all three Sonoff sensors. Just select module **Sonoff TH (4)** and under **GPIO14** configure the sensor you have connected.
### NOT SUPPORTED ### NOT SUPPORTED
Si7021 sensor contains an integrated resistive heating element that may be used to drive off condensation. It's recommended enabling the heater when the humidity readings are above 80%. Humidity readings above 80% become very unreliable. If the "Sonoff Si7021 sensor" is used at the dew point and condensation occurs on the sensor, the on-chip heater could be activated to dry the sensor and restore operation once the sensor is above the dew point. Turning on the heater will also reduce the tendency of the humidity sensor to accumulate an offset due to "memory" of sustained high humidity conditions. Six different power levels are available. The maximum source current of a GPIO pin on an ESP8266 is about 12mA. So the first power level of 3.09mA and second power level of 9.18mA would be theoretically usable. Si7021 sensor contains an integrated resistive heating element that may be used to drive off condensation. It's recommended enabling the heater when the humidity readings are above 80%. Humidity readings above 80% become very unreliable. If the "Sonoff Si7021 sensor" is used at the dew point and condensation occurs on the sensor, the on-chip heater could be activated to dry the sensor and restore operation once the sensor is above the dew point. Turning on the heater will also reduce the tendency of the humidity sensor to accumulate an offset due to "memory" of sustained high humidity conditions. Six different power levels are available. The maximum source current of a GPIO pin on an ESP8266 is about 12mA. So the first power level of 3.09mA and second power level of 9.18mA would be theoretically usable.