CH551 Mini USB MCU DEV Board [CH55x Series]


CH55x is the 8bit enhanced C51 MCU +  USB function board, design from WCH company. CH551 is the cheapest entry version of CH55x series.


  • USB Stick board size
  • On board power led
  • On board GPIO testing led P3.0
  • No need programmer, not even USB-TTL tool! To enter into programming mode, use a tweezer, short connect the two pins in the middle of the board, where marked as “DL”
  • All lead out pins.

Price for one board only.

All documentation please find at CH55X wiki page, or customer github.

WCH CH55x Series:

Additional information

Weight 0.005 kg



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