Simple Arduino Timer Switch

Introduction: Simple Arduino Timer Switch

About: Master in Electronics Engineering

Let's make a simple arduino switch. It is very useful way to run your devices for specific time.


1. Arduino Uno

2. Dot matrix PCB

3. OLED 0.96' Display

4. 5v Relay

5. BC547 Transistor

6. 1N4007 Diode

7. 1Kohm Resistor

8. Push buttons x3

9. Wires

10. Connector

Step 1: Circuit Diagram:

Step 2: Library:

Download library for oled display.

Download zip file from github link below.

Click on "Clone or Download" and Download zip.

To add library to arduino ide goto Sketch> Include Library > Add zip Library> Select zip file.

Step 3: Code:

Change 0x3C from the code to your i2c display address and upload.

Step 4: Finished!

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    2 Discussions


    Question 2 months ago on Introduction

    Can i know how relay connected in this circuit? I mean the way of all pin in that relay.


    Answer 2 months ago

    You can see it in circuit diagram.. Or google any sample relay circuit for your understanding.