Dobrica Pavlinušić's random unstructured stuff
Sonoff T1 3CH: Revision 3
https://tasmota.github.io/docs/devices/Sonoff-T1/

Configuration > Configure Module > Sonoff T1 3CH

immediately after flashing Tasmota (so it won't reset when powered from adapter):

> SetOption13 1

mapping: https://github.com/arendst/Tasmota/blob/a466c5abf33386c3dda34696e11ae975c7ac6649/tasmota/tasmota_template.h#L2468

.pre
{ // SONOFF_T13 - Sonoff T1 3CH (ESP8285)
GPI8_KEY1, // GPIO00 Button 1
GPI8_USER, // GPIO01 Serial RXD and Optional sensor
GPI8_USER, // GPIO02 Optional Sensor (J3 Pin 5)
GPI8_USER, // GPIO03 Serial TXD and Optional sensor
GPI8_REL3, // GPIO04 Blue Led and Relay 3 (0 = Off, 1 = On)
GPI8_REL2, // GPIO05 Blue Led and Relay 2 (0 = Off, 1 = On)
// GPIO06 (SD_CLK Flash)
// GPIO07 (SD_DATA0 Flash QIO/DIO/DOUT)
// GPIO08 (SD_DATA1 Flash QIO/DIO/DOUT)
GPI8_KEY2, // GPIO09 Button 2
GPI8_KEY3, // GPIO10 Button 3
// GPIO11 (SD_CMD Flash)
GPI8_REL1, // GPIO12 Blue Led and Relay 1 (0 = Off, 1 = On)
GPI8_LED1_INV, // GPIO13 Blue Led (0 = On, 1 = Off) - Link and Power status
0, 0, 0, 0
},
.pre