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Dark sensor using transistor, phototransistor and photodiodePosted by: Sagar Sapkota on May 6, 2012 in Basic Electronics, LDR Engineering, MINI Breadboard 6 Comments

Description: This versatile dark sensor is made up of two transistors. It is a versatile module, because

you can use it for testing several electronic components, such as, relay, reed switch, light dependent

resistor(LDR), electret microphone, phototransistor, photodiode, etc. Besides, you can use this module for

making simple clap switch, light operated switch, water level indicator, etc.

Experiment 1: Dark sensor using Light dependent resistor(LDR).

THIS CIRCUIT WORKS WITH 9V ALSO.

When you block the light falling on LDR, the transistor Q1 switches off and transistor Q2 switches on, that

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drives the LED D1. Change the value of R3 to change its sensitivity.

EXPERIMENT 2: DARK SENSOR USING PHOTOTRANSISTOR

For testing a phototransistor, just replace the LDR with a phototransistor, it simply works.

EXPERIMENT 3: DARK SENSOR USING PHOTODIODE

For testing a photodiode, just replace the LDR with a photodiode, it simply works. Anode of photodiode

should be connected to base of transistor Q1(as shown in Figure below).

Schematic made using SchemeIt.

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About Sagar Sapkota

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WATCH THE VIDEO:

EXPERIMENT 4: RELAY TEST

Make dark sensor using relay.

Tagged with: LDRLDR MINI BREADBOARDMINI BREADBOARD PHOTODIODEPHOTODIODE PHOTOTRANSISTORPHOTOTRANSISTOR

Sagar Sapkota is a sole entrepreneur living in Espoo, Finland.

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February 25, 2013 at 6:55 pm

Aravind

How to enhance the dark/light sensor into a miniproject

ReplyReply

January 18, 2013 at 6:57 am

Avijit

Can I make the dark sensor circuit using solar cell instead of photodiod?

ReplyReply

November 20, 2012 at 8:05 am

jed

180 1 24 6102

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hi, how long does the 9volt battery last for the ldr setup? say i put it in patio and when it gets dark it turns

on until dawn, runs for 10hrs a day, thanks

ReplyReply

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