Dark Sensor Using Transistor, Phototransistor and Photodiode
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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
© Copyright 2012, All Rights Reserved
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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