How To Make a Touch Sensor Circuit (Using Only Transistor)
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- Опубликовано: 20 сен 2018
- Touch Sensor Circuit
In this tutorial I teach you how to make a simple touch sensor LED switch. This electronic switch I make basically uses your finger as a resister to complete the circuit and light up the LED. You can also replace the LED for a buzzer or any other output component if you wish.
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Components you need:
LED (any colour)
Transistor (BC547)
1K Resistor
Connecting wire
9V Battery
Watch this video to make a darkness sensor ;)
• Dark/Light sensor circ... 
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That is really cool
Wow, good job it looks complicated but you make it look easy.
Nice .but one suggestion I know how it works but for others you should provide circuit diagram in your videos.keep going👍
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How it was working
@@user-du2yc5qd6g this is kind of transistor switch... basically when he touches the wires his body acts as a resistor and current flows through his body to transistors base....that triggers the transistor and led glows...
👍
This one is capacitive touch sensor or resistive touch sensor?
can I use jumping wires for the touching wire? I only have jumping wires
It should technically work, Try it out yourself
great video! question: i made two on the same breadboard but the first led is dimmer than the other, do i lower resistance on the one going to the dimmer led?
You did exactly what he did and it work?
Is there any data.
Means any presentation or any document link.
That will help a lot in understanding
It simply makes use of the transistor's characteristics.
If you apply a very small voltage to its base, it will allow current to flow from it's collector to it's emitter. And he when he touches the wires his body acts as a conductor which conducts a very small current to the base, yet it's enough to make the transitor conduct current (from the battery) to the LED.
Hi there, if I want it off if I touch? what should be different
Use PNP transistor instead of NPN
Explanation:
This works because your finger conducts electricity and completes the circuit. When the circuit is complete, base current is appreciable and so the collector conducts, turning on LED.
If you want the reverse behavior, i.e. the LED should turn off when you place finger, you need to disconnect an already conducting transistor. When base current increases, collector current decreases in case of PNP transistor.
Hey guys this is the first video in a long time. Please leave a like and subscribe
Can you tell there is capacitive touch sensor or resistive touch sensor
Nice work.Is breadboard necessary ,can't we connect it as it is by manually joining termimals.
you can obviously... he is using so that y[all can understand how to make it
No, you can connect them directly.
Breadboard only make things easier but it's not necessary.
Except led and transistor what are the other things? I didnt understand
9vote battery with resistor and wire
That two stripped wire on middle is what type of wire
Soldering lead
Pls provide Circuit Diagram
How many volts battery?
9V
How much current flows through your finger? Can you feel it?
you cant really feel the electricity flowing through you. You can lick the output of the battery and you’ll be completely fine.
@@Megafish1024 Meaning it's mild electric current of less than 20 mA. 20 mA is what produces the sensation of shock.
@@nothinginteresting1662 yea that’s it
Hi
No benefit from this circuit.
Please teach us how to connect it to relay to make a touch button on off
Thanks
Chiiii