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3A Smart Home HGZB-04D Dimmer
AU
Model reference: HGZB-04D
3A Smart Home HGZB-04D

Available from:
Amazon.com.au
Ebay.com.au



Manufacturer:
3asmarthome.com

Flashed with:
Serial port

GPIO #Component
GPIO00 User
GPIO01 User
GPIO02 User
GPIO03 User
GPIO04 User
GPIO05 User
GPIO09 None
GPIO10 None
GPIO12 User
GPIO13 User
GPIO14 Led3
GPIO15 User
GPIO16 User
FLAG None
Template
{"NAME":"HGZB-4D","GPIO":[255,255,255,255,255,255,0,0,255,255,54,255,255],"FLAG":0,"BASE":54}
TuyaMCU 21,2
DimmerRange 11,255

Serial Flashing

If Tuya-Convert isn’t working for you, you can flash it over a serial link as described on Tasmota - Getting Started

To do so you do need to solder on some cables to allow connecting your flashing tool / software of choice.

This Dimmer switch uses a secondary control chip (8s003f3p6) and it communicates with the main control chip (TYWE3S) using the same connections used for flashing Tasmota. Therefore we have to temporarily disable the secondary control chip by connecting its NRST line to GND For more information check out the datasheet for 8s003f3p6 Here is an image of how I’ve done that:

Next step is to connect the serial connection (RX, TX), and GND and 3V3 (VCC) for the serial connection as per image below. Note, you also need to connect GPIO0 to GND to put the TYWE3S chip into programming mode.

After that follow the guide linked above to flash Tasmota.

Credit for the information goes to HoustonAU on the Home Assistant Forum.