# On and Off Led System

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## Introduction: On and Off Led System

This is about on and off led system.
Here we can on and off the led by touching a particular part of circuit.

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## Step 1: Requirements for Making Circiut

Things needed are:
2. 555 Timer IC
3. Some wires
4.LED
5.100 Ohm resistor
6.4 pins (As touch plates or anything which can conduct electricity)
7. 9 volt battery with battery clip

## Step 2: Steps for Construction

1. Connect 555 Timer IC as shown in figure .
2. Now let's assume upper part of breadboard as positive part and negative part of breadboard as negative part.

## Step 3:

3. Now connect a Wire from positive side of breadboard to the eigth (8th) pin of IC as shown in figure.

## Step 4:

4.Connect another Wire from negative side of breadboard to the positive side of IC or first (1st) pin of IC as shown in figure.

## Step 5:

5. Now connect another Wire from 8th pin of IC to 4th pin of IC as shown in figure.

## Step 6:

6. Now connect anode of LED to the third pin of IC and cathode of LED to the blank space on breadboard as shown in figure.

## Step 7:

7. Now connect 100 ohm resistor from first pin of IC to the cathode of LED as shown in figure.

## Step 8:

8. Now connect touch plates or any other pins which can conduct electricity as shown in figure.
Connect touch plates from pin 1 and 2 of IC and pin 8 and 6 of IC as shown in figure .

## Step 9:

9. Now connect 9 volt battery as shown in figure.
Connect positive end of battery to positive part of breadboard and negative end of battery to negative part of breadboard.

## Step 10:

Now the circuit becomes as shown in figure.

## Step 11:

So by performing all these steps properly the circuit works .
Led can be made on and off.

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## Discussions

Welcome to Instructables. Great first Instructable. Thanks for sharing with the community.