STC15L204 + NRF905 wireless serial port module wireless pass

1.onboard STC15L204EA microcontroller chips
2.onboard NRF905 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 spare I/O are lead to, and mark the I/O name