SunFounder ESP32 Starter Kit
COMPONENT INTRODUCTION PURCHASE LINK
ESP32 WROOM 32E
ESP32 Camera Extension -
Breadboard
Jumper Wires
Resistor
Photoresistor
4.10.2 You Will Learn
• Photoresistor working principle
• Stopping sound playback and stopping scripts from running
4.10.3 Build the Circuit
A photoresistor or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with
increasing incident light intensity.
Build the circuit according to the following diagram.
Connect one end of the photoresistor to 5V, the other end to pin35, and connect a 10K resistor in series with GND at
this end.
So when the light intensity increases, the resistance of a photoresistor decreases, the voltage division of the 10K resistor
increases, and the value obtained by pin35 becomes larger.
514 Chapter 4. Play with Scratch
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