Hardware.
1. MCU (Microcontroller Unit), the main control chip: Atmel’s MEGA32u4 chip, the main function of this chip in this project is his built-in USB to serial programming and debugging functions, to put it bluntly, can be used like a mouse, keyboard.
2. The sensor used is the MPR121, a chip with 12 channels of capacitive touch sensors, communication method is I2C (is a communication protocol).
3. Other peripheral circuits, is the voltage supply circuit, the MCU MEGA32u4 and sensor MPR121 voltage is 3.3v, usb power supply is 5v, so need a voltage conversion circuit will be 5v into 3.3v supply MCU and sensor use.
Software.
The Arduino IDE (Integrated Development Environment), the software used for programming this time, uses the c language for development, it has no complex underlying microcontroller code, no difficult assembly, just simple and practical functions. There is no complex underlying microcontroller code, no difficult assembly, just simple and useful functions that can be called directly to implement many complex functions.