Page 63 - Robo_Genius_V1.0_flipbook_C5

• RGB LEDs come in two main types: Common Cathode RGB LED, Common
Anode RGB LED

• Common Cathode RGB LED: This type

of RGB LED has a shared cathode (-)
for all three colour elements (Red,
Green, Blue). Each colour is controlled

separately by applying a positive
voltage to its respective anode (+).

• Common Anode RGB LED: In this type,
the RGB LED shares a common anode (+) for all three colour elements. Each
colour is controlled separately by grounding its respective cathode (-).

How to Identify RGB LED Pins

1. Look at the Pins

The longest pin is the common pin.

If the longest pin connects to ground (GND), it is a Common Cathode
RGB LED.

If the longest pin connects to positive voltage (+V), it is a Common
Anode RGB LED.
2. Check the Circuit Behaviour

If applying a positive voltage to a colour pin lights up the corresponding

LED, it is a Common Cathode.
If applying ground to a colour pin lights up the corresponding LED, it is a
Common Anode.

For our circuit, we will use a Common Cathode RGB LED.

Resistor

• A resistor is an electrical component that limits the flow of current

in a circuit.
• It is used to control the amount of current that flows through an

LED to prevent it from burning out.
• Resistors have a resistance value measured in ohms (Ω) that

determines how much current they allow to pass through them.

Circuit Building with Tinkercad 61