224 Keypad controller
224 : Keypad controller
- Author: Ian Tawileh
- Description: Reads a keypad and displays the number on the 7 segment
- GitHub repository
- Open in 3D viewer
- Clock: 1000 Hz
How it works
This Project works by driving power to the Cols Columns one by one, then waits for any changes on the Rows (triggered by Human Input) and scans a case to find the combination between the row and col columns before finding the right combination and recording the corresponding key.
This key is passed on to a decode module that finds the correct Seven Segment combination and then passes it on to the 1 digit seven Segment Display where it is displayed.
How to test
Connect your keypad to the PMOD pins and experiment by clicking some buttons and seeing their outputs!
External hardware
Keypad PMOD: https://t.ly/lTZF0
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | row0 | 7 segment display outputs | col0 |
| 1 | row1 | col1 | |
| 2 | row2 | col2 | |
| 3 | row3 | col3 | |
| 4 | col counter 0 | ||
| 5 | col counter 1 | ||
| 6 | |||
| 7 |