ARDUINO 3 Relays Shield (Part-1)

Hey peeps! Here comes my next instructable.

Presenting here 3 channel relay board shield for Arduino to control AC appliances at a time. A Relay is actually a switch which is electrically operated by an electromagnet Relays are useful for triggering AC appliances with a low signal which can be used in home automation systems. The Arduino 3 Relays Shield is a solution for driving high power loads that cannot be controlled by Arduino's digital IO's due to current and voltage limitations of the controller.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: COMPONENTS REQUIRED

1) SPDT 12v Relay - 3

2) Optocoupler 817 - 3

3) LED - 4

4) BC547 Transistor - 3

5) 2 Pin Terminal Block - 4

6) Resistor 1k - 7

7) IN4007 Diode

8) Jumpers

9) 12v Adapter

10) Arduino UNO

11) Connecting Wires

Step 2: CIRCUIT DIAGRAM

In this 3 Relays circuit, an optocoupler is used to trigger the NP N transistor which further drives the relay . The Optocoupler will be triggered by an active low signal. In our project 12v relay is used. A 5v or 6v relay can also be used. LED's indicate the status of each relay.

Step 3: DESIGN

I have designed the 3 relays Arduino shield using Eagle CAD Tool which is convenient for me. Below is the board layout. I have also shared Gerber files which has to be sent to the manufacturer for fabricating board.

Step 4: PCB Fabrication

After generating Gerber from Eagle CAD tool I uploaded my design on LIONCIRCUITS where I can get instant DFM feedback after payment. Custom shape image rendering is also good. Highly recommended.

So guys, Stay tuned for the next part of this instructable.

Be the First to Share

    Recommendations

    • CNC Contest

      CNC Contest
    • Make it Move

      Make it Move
    • Teacher Contest

      Teacher Contest

    Discussions