2 Components: LCSC

 3 PCB Design: EasyEDA

Step 1: Notes:

1 The program is compiled using the ARDUINO IDE and some libraries need to be installed.

2 Node MCU 1.0 (ESP-12E Module) should be checked when using the arduino IDE to download the development board.

3 Some of the API calls in the program, are free to apply for their own.

4 Wifi killer cannot be directly used, because IC pin definition is different, need to modify the source code after brushing in, the modified firmware in the engineering annex.

5 USB serial port chip USES CP2102, need to install the corresponding driver.

Step 2: Improvements