STC15F204 + wireless passthrough module NRF24L01

      1.onboard STC15F204EA single-chip microcomputer, the single chip processor as the 5 v power supply

2.onboard NRF24L01 + wireless module

3.onboard UART interface, used to implement the serial communication

4.onboard 5 V to 3.3 V AMS1117-3.3 chip

5.all the I/O derivation, and mark the I/O name

6.PCB size: 39(mm)x26(mm)