775 RandomNum
775 : RandomNum
- Author: Aakarsh Yadav
- Description: Currently shows a random number on the display
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 10000 Hz
How it works
This circuit takes eight digital inputs (IN0–IN7), processes some of them through logic gates, and drives eight outputs (OUT0–OUT7) that are connected to a seven-segment display.
Inputs IN0, IN1, and IN2 are electrically tied together, forming a single signal called A.
This signal is fed into three NOT gates.
- When A = 0, all three NOT gates output 1
- When A = 1, all three NOT gates output 0
These inverted signals drive OUT0, OUT1, and OUT2.
Some inputs are not modified by any logic gates:
- IN3 → OUT3
- IN4 → OUT4
- IN5 → OUT5
These outputs always match their corresponding inputs.
Inputs IN5 and IN6 are connected to an XOR gate.
- The XOR output is 1 only when the two inputs are different
- The XOR output is 0 when the two inputs are the same
This result drives OUT6.
Inputs IN6 and IN7 are connected to an AND gate.
- The AND output is 1 only when both inputs are 1
- Otherwise, the output is 0
This result drives OUT7.
The outputs are wired to segments of a seven-segment display.
By changing the input values, the combination of active outputs determines which segments light up and ther
How to test
| Output | Logic Description |
|---|---|
| OUT0 | ¬A |
| OUT1 | ¬A |
| OUT2 | ¬A |
| OUT3 | IN3 |
| OUT4 | IN4 |
| OUT5 | IN5 |
| OUT6 | IN5 ⊕ IN6 |
| OUT7 | IN6 AND IN7 |
External hardware
List external hardware used in your project (e.g. PMOD, LED display, etc), if any
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | A_IN0 (shared input, tied with ui[1] and ui[2]) | OUT0 (NOT A, seven-segment control) | |
| 1 | A_IN1 (shared input, tied with ui[0] and ui[2]) | OUT1 (NOT A, seven-segment control) | |
| 2 | A_IN2 (shared input, tied with ui[0] and ui[1]) | OUT2 (NOT A, seven-segment control) | |
| 3 | IN3 (direct to output) | OUT3 (direct from IN3) | |
| 4 | IN4 (direct to output) | OUT4 (direct from IN4) | |
| 5 | IN5 (XOR and direct) | OUT5 (direct from IN5) | |
| 6 | IN6 (XOR and AND) | OUT6 (IN5 XOR IN6) | |
| 7 | IN7 (AND input) | OUT7 (IN6 AND IN7) |