870 7-Segment Counter
870 : 7-Segment Counter
- Author: Angel Viera
- Description: Counts from 0 to 9 once per second on a 7-segment display
- GitHub repository
- Open in 3D viewer
- Clock: 1 Hz
How it works
This project implements a simple decimal counter that counts from 0 to 9 and displays the current count on a 7-segment display.
The design uses a 4-bit counter that increments on each clock edge. When the counter reaches 9, it automatically wraps back to 0 on the next clock cycle. The counter value is decoded into 7-segment display patterns using a combinational logic decoder.
The design expects a 1 Hz clock input (configured via clock_hz: 1 in info.yaml).
How to test
- Connect a common-cathode 7-segment display to the output pins (uo[0] through uo[6])
- Provide a 1 Hz clock signal (or configure Tiny Tapeout to provide it automatically)
- Assert reset (rst_n low) to initialize the counter to 0
- Release reset (rst_n high) and observe the counter counting from 0 to 9 repeatedly
- Each digit should be displayed for 1 second before incrementing to the next
Pin Mapping
- uo[0]: Segment A (top)
- uo[1]: Segment B (top right)
- uo[2]: Segment C (bottom right)
- uo[3]: Segment D (bottom)
- uo[4]: Segment E (bottom left)
- uo[5]: Segment F (top left)
- uo[6]: Segment G (middle)
- uo[7]: Decimal point (always off)
External hardware
You will need:
- 1x Common-cathode 7-segment display (or a TinyTapeout 7-segment display board)
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | ui_unused_0 | Segment A | uio_unused_0 |
| 1 | ui_unused_1 | Segment B | uio_unused_1 |
| 2 | ui_unused_2 | Segment C | uio_unused_2 |
| 3 | ui_unused_3 | Segment D | uio_unused_3 |
| 4 | ui_unused_4 | Segment E | uio_unused_4 |
| 5 | ui_unused_5 | Segment F | uio_unused_5 |
| 6 | ui_unused_6 | Segment G | uio_unused_6 |
| 7 | ui_unused_7 | Decimal Point | uio_unused_7 |