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Updated Sonoff Th (markdown)

Michael Ingraham 2019-03-09 14:27:54 -05:00
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Sonoff-Th.md → Sonoff-TH.md

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Itead Product Page: https://sonoff.itead.cc/en/products/sonoff/sonoff-th - [Itead Product Page](https://sonoff.itead.cc/en/products/sonoff/sonoff-th)
Itead Shop: https://www.itead.cc/smart-home/sonoff-th.html - [Itead Shop](https://www.itead.cc/smart-home/sonoff-th.html)
Itead Wiki: https://www.itead.cc/wiki/Sonoff_TH_10/16 - [Itead Wiki](https://www.itead.cc/wiki/Sonoff_TH_10/16)
![](https://smartlife.tech/blog/wp-content/uploads/2017/06/SonoffTHDiagram-1.jpg) ![](https://smartlife.tech/blog/wp-content/uploads/2017/06/SonoffTHDiagram-1.jpg)
**Model:** **Model:**
Sonoff Th 10 or 16 / Ver 2.0 (year 2017/2018/2019) based on Esp8266 Sonoff Th 10 or 16 / Ver 2.0 (year 2017/2018/2019) based on ESP8266
**Led:** **Led:**
One red, one blue One red, one blue
@ -20,14 +20,14 @@ Sonoff Th with relay rated to 10 or 16 amps (Input voltage: 90~ 250V AC)
The jack socket marks most important difference to the model "Sonoff Basic"(year 2017 to 2019). The jack socket connects to GPIO14. The jack socket marks most important difference to the model "Sonoff Basic"(year 2017 to 2019). The jack socket connects to GPIO14.
**Sonoff sensors with 2.5mm jack:** **Sonoff sensors with 2.5mm jack:**
Sonoff sells 3 sensors with 2.5mm jack to use with the Sonoff Th. Sonoff TH Sensor Si7021 / Sonoff TH Sensor-AM2301 / Sonoff Temp Sensor-DS18B20. Lengs of the wires are approximately 47cm. The DS18b20 sensor comes with a wire length of approximately 1m. Sonoff sells 3 sensors with 2.5mm jack to use with the Sonoff Th. Sonoff TH Sensor Si7021 / Sonoff TH Sensor-AM2301 / Sonoff Temp Sensor-DS18B20. Length of the wires are approximately 47cm. The DS18b20 sensor comes with a wire length of approximately 1m.
**It's important to clarify: Out of the box a Si7021 sensor is a i2C device. The "Sonoff Si7021 sensor" is BASED on an Si7021. But to make this sensor plug&play on a Sonoff Th together with the other two sensors sold by Sonoff, an 8-bit MCU is added on the board. This changes the i2C communication of an Si7021 sensor over to a 1-wire communication!** That's why a "Sonoff SI7021 sensor" doesn't work in combination with a i2C library. **It's important to clarify: Out of the box a Si7021 sensor is a I<sup>2</sup>C device. The "Sonoff Si7021 sensor" is BASED on an Si7021. But to make this sensor plug&play on a Sonoff Th together with the other two sensors sold by Sonoff, an 8-bit MCU is added on the board. This changes the I<sup>2</sup>C communication of an Si7021 sensor over to a 1-wire communication!** That's 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. Sonoff Si7021 / Sonoff TH Sensor-AM2301 / Sonoff Temp Sensor-DS18B20. Just choose o the web interface Sonoff Th and select under GPIO14 the sensor you have connected. Tasmota supports Sonoff Th with all three Sonoff sensors. Sonoff Si7021 / Sonoff TH Sensor-AM2301 / Sonoff Temp Sensor-DS18B20. Just choose o the web interface Sonoff Th and select under GPIO14 the sensor you have connected.
**NOT SUPPORTED up to now:** The Si7021 contains an integrated resistive heating element that may be used to drive off condensation. It's recommend enabling the heater when the humidity readings are >80%. Humidity readings >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. 6 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. **NOT SUPPORTED up to now:** The Si7021 contains an integrated resistive heating element that may be used to drive off condensation. It's recommend enabling the heater when the humidity readings are >80%. Humidity readings >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.
Keep that in mind if you use this "Sonoff Si7021 sensor" outdoors ! Maybe in the future Tasmota finds also a way to support the important heater feature of a "Sonoff Si7021 sensor" . Keep that in mind if you use this "Sonoff Si7021 sensor" outdoors! Maybe in the future Tasmota finds also a way to support the important heater feature of a "Sonoff Si7021 sensor" .
https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf [Si7021 Datasheet](https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf)