PM-SW702 / TYWE2S smart plug jig

Summary:

I purchased some iSelector (SM-PM702) smart plugs to try to flash Tasmota firmware on. I tried to come up with a least intrusive way but in the end you still will need to get to GPIO 1 located in a hard to reach place in the plug.

The jig seems to work, I see the ESP boot loader message from the Tuya firmware.

This Will not flash a SM-PM702 as is.

I'm publishing this in case it is of use to anyone and or may want to solder a jumper to GPIO 1. Untested as of now for actual flashing.

TLDR;

BOM:

SM-PW702 here is the iSelector branded one I used

Pogo Pins - P75-E2 is what I used

Description:

Attempt to flash Tasmota on iSelector SM-PW702

I tried to keep tear down to a minimal. I stopped when I realized PCB was not completely removable without unsoldering the mains plug. I didn't want to do that.

If we can cut a slit in the case to reach the edge of the TYWE2S, we can access

PINS: VCC, GND, RX, TX

Which is what this jig was designed to do.

I was hoping the "on-off" switch was tied to GPIO, but in my testing I wasn't able to get esptools to do anything.

This might have been error on my part of timing and sequence to get esptools to recognize it.

I'm stopping for now. Maybe someone else will have better luck and tell me what I may be doing wrong.

I may try soldering a jumper to GPIO on the TYWE2S later.

Notes:

• TYWE2S connector is 2.00MM pitch. If you're using "dupont" jumpers, you will have to bend the pogo pins to fit 4 jumpers.
• I mostly print in ABS, so you may need to scale accordingly
• Orient to print on bottom (where the contact side of pogo pins protrude) to bed, finger tap point up.
• no support needed

Reference

Tuya TYWE2S ESP8266EX Module

Category: Electronics