Shawader 3Ch Touch Light Switch (WLS028 3)
Shawader 3Ch Touch Light

Available from:


Install method:
USB to Serial

GPIO #Component
GPIO00 None
GPIO01 Output Lo
GPIO02 None
GPIO03 Button_n 3
GPIO04 Button_n 1
GPIO05 Button_n 2
GPIO09 None
GPIO10 None
GPIO12 Relay 2
GPIO13 Relay 3
GPIO14 Relay 1
GPIO15 None
GPIO16 None
GPIO17 None


Installation was done over serial as Tuya version was to new for Tuya Convert to work.

  1. Open the device and locate the 6 pads on the back of the button PCB (not the relay PCB).
  2. The pinout for the 6 pads is as follows (starting from left if pads is in upper right corner):
    1. 3.3V
    2. RXD
    3. TXD
    4. GPIO0 (Boot mode pin)
    5. RES12K
    6. GND

Solder cables to the pins and then do as follows:

  1. Connect GND.
  2. Connect RXD to TX on USB to Serial converter.
  3. Connect TXD to RX on USB to Serial converter.
  4. Connect GPIO0 to GND.
  5. Connect RES12K to GND.
  6. Connect 3.3V.
  7. Disconnect RES12K from GND.
  8. (Optional) make backup of original firmware.
  9. Flash tasmota using the USB to Serial converter.


Enable the template and execute the following command:

Backlog ButtonTopic1; ButtonTopic2; ButtonTopic3; SetOption13 1;

Pinout PCB