witawat/programmable-mcu-stc15f104w-development-board

Programmable-MCU-STC15F104W-Development-Board

This board consists of a STC15W104W microcontroller and a CH340G USB interface. Print is marked: CJMCU-104 found on ebay, ali-express etc This repository holds:

• The reverse-engineered schematic.
• A tiny demo project.

Preparation:

Needs a drop of solder to connect all 2 or 3 solder islands in the corner of the pcb either on the 3.3V or 5V to select the voltage before using it.

Software requirements:

• SDCC (free to use compiler w/o any limits like keil)
• AtmelStudio 7 (not needed, but has integrated environment, editor, C beautyfier, tools like make, etc...)
• stc-isp-15xx-v6.88.exe (to program the STC processor)

Links:

Compiler/Linker SDCC: http://sdcc.sourceforge.net/

Programming software to download into STC processor: http://www.stcmicro.com/rjxz.html

Pictures

To understand the hidden connections, removed the crystal:

And drawn the two connections between the usb and processor parts of the board.