4-digit 7-Segment (common cathode, raw)
by Generic
SKU: PSA-CMP-SEG7
No reviews yetTypical India street price
₹25–₹70
Bare clock digits — teach multiplexing before buying TM1637.
Interface: GPIO multiplex or TM1637/MAX7219
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Concept
Seven LEDs + DP per digit; digits share segments and are scanned fast.
A little theory
Persistence of vision ~1 kHz multiplex. Series resistors per segment. In the classroom, treat 4-digit 7-Segment (common cathode, raw) as a intermediate part using GPIO multiplex or TM1637/MAX7219. Typical India street price is about ₹25–₹70. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Or skip pain and use TM1637 module — this SKU is the raw display.
Classroom & project use
- Scoreboard
- Clock
- Counter
Buying in India
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Digits | 4 |
| Type | 7-seg CC typical |
| Category | Displays |
| Difficulty | Intermediate |
| Voltage | 5V via resistors |
| Interface | GPIO multiplex or TM1637/MAX7219 |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
