STC15F204 + NRF905 wireless serial port module wireless pass through module wireless

1.On board STC15F204EA microcontroller chips.

2.On board NRF905 wireless module.

3.On board UART interface, used to implement the serial communication.

4.On board 5 V to 3.3 V AMS1117-3.3 chip.

5.All spare I/O are lead to, and mark the I/O name.