Sonoff TH Elite 20A Temperature and Humidity Monitoring Switch Module (THR320D)
Sonoff TH Elite 20A Temperature and Humidity Monitoring

Available from:


Install method:
USB to Serial

GPIO #Component
GPIO00 Button 1
GPIO01 None
GPIO02 None
GPIO03 None
GPIO04 Relay 3
GPIO09 None
GPIO10 None
GPIO12 None
GPIO13 Led_i 2
GPIO14 None
GPIO15 LedLinki
GPIO16 Led_i 1
GPIO17 TM1621 CS
GPIO18 TM1621 WR
GPIO19 Relay_b 1
GPIO20 None
GPIO21 None
GPIO22 Relay_b 2
GPIO23 TM1621 RD
GPIO24 None
GPIO25 User
GPIO26 None
GPIO27 Output Hi
GPIO6 None
GPIO7 None
GPIO8 None
GPIO11 None
GPIO32 None
GPIO33 None
GPIO34 None
GPIO35 None
GPIO36 None
GPIO37 None
GPIO38 None
GPIO39 None
Configuration for ESP32
{"NAME":"Sonoff THR320D","GPIO":[32,0,0,0,226,9280,0,0,0,321,0,576,320,9184,9216,9312,0,0,9313,9248,0,1,0,3840,0,0,0,0,0,0,0,0,0,0,0,0],"FLAG":0,"BASE":1}
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Use the device button to enable flash mode.

Follow the GitHub issue thread for development updates

Sensor Wiring

Sensor are connected with a standard phone plug, search for 4P4C, RJ9, RJ10, or RJ22. You can use an adapter to connect old sensors with an audio jack.

4P4C RJ9/RJ10/RJ22

4P4C RJ9/RJ10/RJ22 ESP
1 (Yellow on image) 3V3 GPIO27 providing 3V3
2 (Green on image) GPIO25 data
3 (Red on image) NC
4 (Black on image) GND