5 mm RGB LED (common cathode/anode)
by Generic
SKU: PSA-CMP-RGB-LED
No reviews yetTypical India street price
₹5–₹20
One package, three colours; mix with PWM.
Interface: 3× PWM GPIO
Drive an LED (with resistor) or the kit lamp output from the lamp pin.
Lamp/LED → D4 (GPIO2)
Blockly: set_lamp, set_led
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Concept
Red, green, blue dice. Additive colour.
A little theory
Common cathode: three anodes + shared GND. Common anode: opposite. PWM duty = brightness. In the classroom, treat 5 mm RGB LED (common cathode/anode) as a beginner part using 3× PWM GPIO. Typical India street price is about ₹5–₹20. 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
Three resistors, three PWM pins. analogWrite each channel.
Classroom & project use
- Mood lamp
- Status colour
- Traffic + extra
Buying in India
Precautions
- Share a common GND with the microcontroller
- Verify polarity and voltage before powering the circuit
Specifications
| Type | 4-pin RGB |
| Control | PWM ×3 |
| Category | LEDs & Indicators |
| Difficulty | Beginner |
| Voltage | Per die 2–3.2V |
| Interface | 3× PWM GPIO |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
