Introduction - If you have any usage issues, please Google them yourself
Microcontroller C language- based on AVR+PROTEUS simulation, phone keyboard emulation program. Imitation mobile phone keyboard matrix key is pressed, the corresponding key character display 1602LCD on this case, the option to enter a phone number or English character sequence, to achieve the effect of simulation handset phone or string input (for example, use the Pinyin input method) effect.