How to Make a "Touch Sensor" Using 555 Timer IC on Breadboard.

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A touch sensor is a type of equipment that captures and records physical touch or embrace on a device and/or object. It enables a device or object to detech touch, typically by a human user or operator. A touch sensor may also be called a touch detector.

Step 1: Components Required:-

Components Required:- 555 Timer IC , Breadboard , 9v battery with holder , 2 wires, 2 L.E.D's and 4 pins as 'Touch Plates'

Step 2: Steps of Construction:-

STEPS OF CONSTRUCTION:-

The 555 Timer IC has 8 Pins.

1. Connect 2 pins from pin 1 & pin 2 of IC as the 1st touch plate and connect 2 pins from pin 6 & pin 8 of IC as the 2nd touch plate.

2. Then connect a wire which goes from the negative side of the battery to pin 1 of IC.

3. Then connect another wire which goes from the positive side of the battery to pin 8 of IC.

4. Now connect the cathode(negative) side of the L.E.D to the 3rd pin of IC and the anode (positive) side of the L.E.D to the positive side of the battery.

5. Now connect the anode (positive) side of another L.E.D to the 3rd pin of IC and the cathode (negative) side of the L.E.D to the negative side of the battery.

You can even connect a buzzer in place of one L.E.D to have a different effect.??

Step 3: Testing the Touch Sensor

Once you connect the battery then touch on the 'Touch Plates' to see the L.E.D's changing.

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13 Discussions

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Kat.L.Hamill

6 months ago

I tried this activity and the LED's kept overheating and one of the IC's started smoking! Any ideas why? It was hooked up exactly as show in the instructions. did this with 7 students and 5/7 of them had the same issues. Red, yellow and white LEDs were used and the colour didnt affect it.

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mahiboob

Question 11 months ago on Step 3

555 timer operaating which made either astable or bistable?
can you explain how the timer will work in touch platw

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prasadbu33

Question 1 year ago on Step 2

if we forget to touch another side, will it be glow that light forever or is there any down time for 555 timer ic. Please ans me quickly sir...

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Muskan sultana

1 year ago

Plsss send me circuit diagram in muskansultana1998@gmail.com

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utkarshk18

1 year ago

Ples give digram in utkarsh763129295095702264650@gmail.com

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ashish143143

2 years ago

plz send m circuit diagram on.......ashish.eep.inst@gmail.com

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joietjose

2 years ago

please provide circuit diagram

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JRV31

2 years ago

I am going to try this, I like 555s.