12 Countdown Timer
12 : Countdown Timer
- Author: To Chan
- Description: Zero to ASIC Term Project
- GitHub repository
- Open in 3D viewer
- Clock: 160000000 Hz
How it works
Debounce the inputs, drive an encoder module to adjust seven segments and pwm output. There is ctrl pin to enable countdown in every minute on the seven segments. A 16MHz clock oscillator is required.
How to test
Twist each encoder and the attached PMOD and LED should change the display value and brightness. Enable the ctrl pin to start the minute countdown.
External hardware
Use 1x PMOD and 3x LED display attach the output pins, 3x digital encoders attach to the input pins.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | enc0 a | AA | pwm 0 |
| 1 | enc0 b | AB | pwm 1 |
| 2 | enc1 a | AC | pwm 2 |
| 3 | enc1 b | AD | |
| 4 | enc2 a | AE | |
| 5 | enc2 b | AF | |
| 6 | AG | ||
| 7 | CTRL | CAT |