Lesson Two – Photoresistor and LED

Sometimes you want to control the brightness of the LED according to the brightness of the room, so this circuit is there for you!

What way it may look like if you build this circuit with an Arduino kit: 

We will build this step-by-step in TinkerCad Circuits:

STEP 1: Connect the Arduino board with the breadboard

STEP 2: Land one side of the photoresistor onto either positive bus, and connect other side to any empty row

STEP 3: Add LED

Long leg connected to the same row as the photoresistor
Other leg can land in any other free row

STEP 4: Add 220 Ohm Resistor

One leg lands in same row as short LED leg
other leg lands anywhere in either negative bus

STEP 5: Test your circuit!

Click “Start Simulation”, your circuit should light up.
The resistance of a photoresistor decreases with increasing light, so the LED will start off bright in a well lit room!