Overview

We are hoping to flash Tasmota firmware on our Treatlife DS01C Dimmer switch.

Version 1

The initial Treatlife DS01 uses used a TYWE3S Chip (ESP8266):

This dimmer has an MCU connected to the TYWE3S over the RX/TX pins.

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BF7612AMXXE-CN-MCU-Datasheet

Flashing Notes from Net

It seems that some people have had luck flashing by:

• OTA update using TuyaConvert for older versions of this dimmer
• Flashing using a USB/serial board with the following connections
  • Vcc - 3.3V
  • TX - RX
  • RX - TX
  • GND - GND
  • GPIO-0 - GND

• Cutting the RX/TX lines on the MCU board and flashing with the above connections.
• Disabling the MCU (disable the chip using it's NRST/RST (Reset) pin if available) and flashing
• Desoldering the TYWE3S board and flashing

Flashing - Disabling the MCU

To boot the TYWE3S in flashing mode, GPIO0 needs to be connected to GND while powering up. It can be left grounded for the entire process. Flashing a TYWE3S connected to a MCU is a bit trickier than one without MCU. This is due the same Rx Tx pins used by MCU and serial programmer for flashing. The TYWE3S cannot be booted to flash mode with MCU sending data over the same pins. To be able to do that, we need to disable MCU from sending data over Rx and Tx pins. There are few ways to do it:

Keep MCU disabled is by identifying the NRST/RST (Reset) pin of the MCU from its datasheet and connect it to GND for the entire flashing process. This will keep MCU disabled while you flash TYWE3S. If there are some contacts or test points in switches that connect to the MCU, you might be lucky to find contacts for RST that you can easily solder onto.

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From the above picture, it appears that the MCU differs from the one in the Treatlife DS01C.

Cutting the Rx/TX pin on MCU

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Cutting the RX/TX pins on the MCU was reported to help with flashing the TYWE3S chip without desoldering.

Pictures

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Tracing

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Flashing

This chip is essentially an ESP8266. The ESP-12 Chip has the same pinout. 

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To flash the ESP-12, you would need to connect it up as follows:

Ground GPIO-0 and power up the chip to enter programming mode.

We will flash the chip using Tasmotizer. 

See https://github.com/tasmota/tasmotizerFlash:

Disconnect GPIO-0 from ground and toggle power to configureboot

Re-assemble

Version 2

A newer version uses a custom chip which is not an ESP8266

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For this version we will de-solder the chip and replace it with an ESP8266 (ESP-12F)

Flashing 

We can flash the board using the same procedure outlined for version 1. However, I decided to buy a new product to make flashing easier.

Wishiot ESP8266 Burning Fixture Development Board Micro USB Port Onboard CP2102 Chip Support ESP-01S ESP-07 ESP-07S ESP-12E ESP-12F ESP-12S ESP-C2 Easy Programer

https://www.amazon.ca/dp/B08BXMGVNM?psc=1&ref=ppx_yo2ov_dt_b_product_details

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Just pop your ESP-12F into the board and flash using Tasmotizer.

After flashing, solder the board back onto the board.

Finished Board with new ESP-12F chip installed.

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Configuring

Configuration is the same for both versions.

https://templates.blakadder.com/treatlife_DS01.html

From the console, issue the following commands:

TuyaMCU 21,2
dimmerrange 150,1000
Rule1 on system#boot do SerialSend5 55AA00060005040400010114 endon
Rule 1 1 

All Done!

References