DS-121_4

---
date_added: 2020-10-26
title: DS-121 4 Gang No Neutral
model: 
image: /assets/device_images/DS-121_4.webp
template: '{"NAME":"2 Gang Switch","GPIO":[158,57,0,17,22,18,0,0,0,21,56,0,0],"FLAG":0,"BASE":18}'
link: https://www.aliexpress.com/item/1005001392163307.html
link2: 
mlink: 
flash: serial
category: switch
type: Switch
standard: us
---
Smatrul appears to be the main seller but they are also sold by Avatto (I can confirm that even 99% of the packaging is the same).  Tuya convert was attempted and did not work.

Ground GPIO0 during boot. Ground RST as well. (So really that means a 3 pin splitter from GND to GPIO0 + RST + GND of Serial Flasher.)

After clicking "Start" in Tasmotizer, wait 1 second, then UN-ground RST and it will finish the operation.  Or make a momentary connection just before flashing starts?

I watched the red lights of TX/RX on the Flasher, after clicking "Start" they will flash a few times, then stop briefly.  This is the best time to un-ground RST.  If it doesn't go bright red right away, try making a momentary connection.  Multiple attempts may be needed.

The 4 Gang version of this may lack a solder point to the RST pin.  A momentary connection during the flashing process may be enough.

It may not be necessary to do all this extra work.  Try doing a simple 4 pin flash first.