Sonoff Touch is based on the ESP8285. Though the actual chip inside may be a PSF-A85.
Please see the Hardware Preparation page for general instructions.
Carefully remove the top PCB from the assembly. The hidden underside of the PCB contains the ESP8285 as shown in the pictures.
Be careful while removing and reassembling the top PCB. The touch sensor should be back in its intended place, be sure to not touch it directly during the modifications.
The Sonoff Touch button is not connected to GPIO0 and can not be used to bring the module into flash mode. A connection between GPIO0 and GND needs to be made manually. GPIO0 can be found on the right side of the ESP8285 and is the second pin from the bottom, as marked on the image.
Note: Even if you have the PSF-A85 chip inside instead of a default ESP-8285, the GPIO0 pin is in the same location. Pay attention to the corner of the chip with three unused solder contacts. That is where the external antenna connector is located in the images above. The PSF-A85 in the Sonoff Touch does not have the external antenna connector soldered on.
- Itead Product Page: http://sonoff.itead.cc/en/products/residential/sonoff-touch
- Itead Shop: https://www.itead.cc/sonoff-touch.html
- Itead Wiki: (na)