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Electronics => Projects, Designs, and Technical Stuff => Topic started by: flywire on March 10, 2021, 03:57:16 am

Title: Serial Inteface for WZ5020L 20A 1000W Power Supply
Post by: flywire on March 10, 2021, 03:57:16 am

I have a WZ5020L 20A 1000W Power Supply (https://www.aliexpress.com/item/1005001936115550.html) - see:

review (https://www.youtube.com/watch?v=Ya2MIEn6cSw)

It's got an N76E003AT20 - an 8051 compatible uController https://www.nuvoton.com/export/resource-files/DS_N76E003_EN_Rev1.08.pdf (https://www.nuvoton.com/export/resource-files/DS_N76E003_EN_Rev1.08.pdf). The components are tightly integrated and I'm not aware of any published serial connection information, although it seems to be provided for on the board near the screen/button connectors.

Any ideas on how I can hack into it with serial control? I'd like to control it with an esp32.

Title: Re: Serial Inteface for WZ5020L 20A 1000W Power Supply
Post by: Tony9671111 on November 30, 2021, 02:22:05 am

A little late but the communication to the WZ5020L Display is SPI on 3 lines at 3.3 volts.
The 5 control signals to the board from the switches and encoder are just using a signal to ground, which are normally 3.3 volt floating signals from the board.
The ESP32 Slave SPI software on GitHub works to get you started.