How to Make a Dark Sensor
Intro: How to Make a Dark Sensor
Hey guys ,
In this project I am going to show you how to make a dark sensor using a single transistor and some few resistors in just 3 simple steps .
here is my video this is my old dark sensor
In this project I am going to show you how to make a dark sensor using a single transistor and some few resistors in just 3 simple steps .
here is my video this is my old dark sensor
STEP 1: Things You Need
Parts:-
1) 1x BC547 transistor
2) 1x 220 k resistor
3) 1x 330 ohms resistor
4) 1- small perf board
5) 1x led (any colour )
6) wires
7) 9v battery
8) battery clip
9)ldr(light dependent resistor )
Tools:-
1) soldering rod and wire
2) wire stripper
1) 1x BC547 transistor
2) 1x 220 k resistor
3) 1x 330 ohms resistor
4) 1- small perf board
5) 1x led (any colour )
6) wires
7) 9v battery
8) battery clip
9)ldr(light dependent resistor )
Tools:-
1) soldering rod and wire
2) wire stripper
STEP 2: Getting Started
solder the transistor on the perf board and solder one wire of the ldr to the emitter and other to the base , solder the negative wire of the led to the base of the transistor with a 330 ohms resistor and also solder 220k resistor with the one side of the 330 ohms resistor
STEP 3: Finishing Touches
I have also used a SPDT switch it is optional I have used to pin headers as the connectors for the power .
28 Comments
PrathamK5 6 years ago
savdd 10 years ago
hey is there a way to make it so that when i hover my hand over it, it will stay on then when i hover over it again, it will turn off. thx
Pranavthegreat 10 years ago
I don't think so you can with just a transitor , you might need a microcontroller and PIR sensor
Ingenerare 8 years ago
A microcontroler with in combination with aLDR will do the job also
dharmik pater 8 years ago
AnindyaG1 8 years ago
prashanth.kumar.140 9 years ago
its not working the way you said
its glowing without closing with hand any alternative for this.
sunny.saraswat.3154 9 years ago
if i use 200k resistor inthe place of 220 k resistor
and i use 300 ohms resistor in the place of 330 ohms resistor'
thanks
sunny.saraswat.3154 9 years ago
if i use 200k resistor inthe place of 220 k resistor
and i use 300 ohms resistor in the place of 330 ohms resistor'
thanks
sunny.saraswat.3154 9 years ago
if i use 200k resistor inthe place of 220 k resistor
and i use 300 ohms resistor in the place of 330 ohms resistor'
thanks
sunny.saraswat.3154 9 years ago
if i use 200k resistor inthe place of 220 k resistor
and i use 300 ohms resistor in the place of 330 ohms resistor'
thanks
ankit.mehta.1401933 9 years ago
Very nice project
but i want to use a buzzer in the place of led what should i do
Thxx in advance
Pranavthegreat 9 years ago
ankit.mehta.1401933 9 years ago
Very nice project
but i want to use a buzzer in the place of led what should i do
Thxx in advance
aaamir2 10 years ago
i have a problem.
i have followed the steps
but instead of Dark its working as a Light Detector any idea why Thanks
Pranavthegreat 10 years ago
lukeD 10 years ago
is there a way to control how much light there is needed to light up the led? i think it would be possible with other resistors, wich one would that be?
I want it to light up when it is only half dark.
Pranavthegreat 10 years ago
muhammad-zka 10 years ago
Pranavthegreat 10 years ago