Page 81 - Electronics Starter Kit_EN

Lesson 21: Break Beam Detector Buzzer with NE555

and Photoresistor

21.1 Overview

In this lesson we are going to learn how to make a Break beam detector circuit.

21.2 Components Required

1 x BreadBoard Power Supply
1 x 9V Battery
1 x 9V Battery Connector
1 x BreadBoard 830p
1 x NE555 Timer
1 x Passive Buzzer
1 x 5mm white LED
3 x 10 KΩ resistor
1 x 220 Ω resistor
2 x 2N2222 NPN Transistor
1 x Photoresistor
1 x 10 uF Capacitor
2 x 100 nF Capacitor
15 x M-M wires (Male to Male jumper wires)

21.3 Circuit

You should put the LED and the LDR in front of each other.

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