This is 4x4 USB HID Keypad application. It consist 0-9,A,B,C,*,# characters and backspace. By applyint the signal one by one on 4 row of 4x4 matrix keypad and Scaning the the 4 column one by one to detect which key is pressed. After detecting which key is pressed using the USB keyboard descripter it sends the correspong value using USB API(provided by STM).
Hardware and Software used to build this project -
- STM32F103
- 4x4 Matrix Keypad
- Jumper wires
- Keil IDE
- STM32CubeMX