Page 23 - Robo_Genius_V1.0_flipbook_C7

Step 9 Connect a 220 Ω resistor to the longer lead (anode)
of the LED as shown in the image.

Step 10 Connect the shorter lead (cathode) of the LED to
the negative rail of the breadboard.
Step 11 Place a potentiometer on the breadboard as per
the image.

Step 12 Connect the first terminal of the potentiometer
to the negative rail of the breadboard.

Step 13 Connect the second terminal of the
potentiometer to the positive rail of the
breadboard.

Step 14 Connect the middle terminal (wiper) of the
potentiometer to the resistor’s second end as
shown in the image.
Step 15 Now, rotate the knob of the potentiometer
and observe that the brightness of the LED will
change accordingly.

Circuit Operation

When the circuit is powered on, the potentiometer controls the amount of current flowing to the
LED. By rotating the knob of the potentiometer, changes in the resistance, leds to a change in the
brightness of the LED. Lower resistance allows more current to flow, making the LED brighter, while
higher resistance reduces the current, dimming the LED.

Hands-On Electronics with Breadboard-Based Kit 21