Introduction: DIY | Adjustable Timer Using 555 & Potentiometer

Picture of DIY | Adjustable Timer Using 555 & Potentiometer

DIY | Adjustable Timer using 555 & potentiometer

Step 1:

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Step 2: Making Video

You can watch the making of the video by the clicking the video linked in this step or continue reading to make your own timer

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Step 3: Components Required

Picture of Components Required

1. Push Button

2. 555 Timer IC

3. Red & Green Led

4. 100uF / 25 volt capacitor

5. 0.01uF capacitor

6. 2.2 Mega Ohm resistor

7. 10k Ohm Resistor

8. 330 Ohm Resistor

9. 220 Ohm Resistor

10 470k Ohm Potentiometer

11. 3 Pin PCB male & Female connector

12. PCB Board

13. Wires

14 Battery & Battery Cap

15 Hot Glue Gun

16 Insulation Tape

Step 4: Circuit Diagram

Picture of Circuit Diagram

In my design i have used RED LED for output, But if you need real practical application i would suggest adding a

5 volt relay or a 5 volt buzzer so that it can perform some other operation once achieving the time.

Step 5: Construction

Picture of Construction

Mount & connect all the components as per the circuit diagram.

Note :

1. as mentioned in the previous step in the image 3 i have used RED LED for output, But if you need real practical application i would suggest adding a 5 volt relay or a 5 volt buzzer so that it can perform some other operation once achieving the time.

2. I have used 3 pin connector & attached it to 470k potentiometer as shown in the image 5. The reason for doing this is, so i can change the potentiometer for different timing. Using 470k pot i would achieve time range between 5 to 10 minute. To achieve lower time range using lower potentiometer will help.

3. to achieve higher time range you need to increase the value of the electrolytic capacitor which is connected to the pin 6 of the 555 timer (shown in the image 4)

4. This circuit achieves only a approximate value. To achieve a exact timer i would recommend using programmable or micro controller based timer(ex: Arduino)

Step 6: Finished Images

Picture of Finished Images

1st Image - Finished Board

2nd Image - Timer Running

3rd Image - Output

To watch the real time testing pleaseCLICK HERE

Testing begins @ 2 minute mark

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