Step 1: THINGS WE NEED
Step 2: OPTOCOUPLER
Step 3: Add positive pin of led to pin 1 of optocoupler
Step 4: Add 220 Ohm resistor to -ve pin of LED
Step 5: Add jumper to pin 2 of optocoupler which will go to +ve power supply
Step 6: Join source of triac to 4th pin of optocoupler
Step 7: Add 470 ohm resistor between the drain and 6th pin of optocoupler
Step 8: Add two jumpers, one to drain and another to gate
Step 9: BINGO! time to test
Step 10: Add Power Supply
Step 11: Print the final PCB

Published July 13, 2016 © TAPR-OHL

DIY Solid State Relay

Ever wanted to get rid of that tic-tac sound electromagnetic relays make? Now you can!

IntermediateFull instructions provided1 hour11,272

Things used in this project

Hardware components

Triac BT136

Resistor 475 ohm

LED (generic)

Jumper wires (generic)

Resistor 221 ohm

Breadboard (generic)

Optocopler

Story

Ever wanted to get rid of that tic-tac sound electromagnetic relays make? Electromagnetic relays require quiet power to turn the electromagnet on/off and need a driver circuit for that, oh! wait! also they need a flyback diode to avoid the risk of inductive spiking which may not be suitable for projects running on battery or projects which you want to be power efficient.

If you want to get rid of all those things in once you are at the right place, here I will show you how to make Solid State Relay using just couple of components.

WARNING:- THIS PROJECT DEALS WITH HIGH-VOLTAGE (AC MAINS) USE FULL PRECAUTIONS. I WILL NOT BE RESPONSIBLE FOR ANY KIND OF DAMAGE CAUSED TO YOU.

LET's GET STARTED!!

DOWN HERE IS THE COMPLETE VIDEO TUTORIAL FOR THE SAME.

Step 1: THINGS WE NEED

(https://www.utsource.net/ is an online platform for technicians, Makers, Enthusiasts, Kids to buy electronic components

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Triac- BT136
Optocoupler- MOC3021 (used to isolate high-voltage from low-voltage input)
Resistors- 220 ohms and 470 ohms
LED - Just for indication of state
Breadboard- For making prototype
Jumpers
5V power supply ( I will use my arduino for this)

Finally the Schematic.

Step 2: OPTOCOUPLER

Add it to the breadboard.

Step 3: Add positive pin of led to pin 1 of optocoupler

Step 4: Add 220 Ohm resistor to -ve pin of LED

Step 5: Add jumper to pin 2 of optocoupler which will go to +ve power supply

Step 6: Join source of triac to 4th pin of optocoupler

Step 7: Add 470 ohm resistor between the drain and 6th pin of optocoupler

Step 8: Add two jumpers, one to drain and another to gate

Step 9: BINGO! time to test

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Step 10: Add Power Supply

I used my arduino mega with blink sketch.

Step 11: Print the final PCB

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Don't know how to print PCB's? Watch this.

From HERE you can download the PCB file in .pcb extension.

Don't know how to print PCB's?

PAY ATTENTION- you need to make the traces thick because it is a high-voltage project, to know how to tin PCB see this instructable

To see the working watch the video I linked in Introduction.

Thanks to DIY bloke for my inspiration for this project.

Thank You for coming here!

See you again,

Tanishq Jaiswal

Code

Blink

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN takes care 
  of use the correct LED pin whatever is the board used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
  
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
  
  modified 2 Sep 2016
  by Arturo Guadalupi
*/


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Credits

Tanishq Jaiswal

39 projects • 54 followers

I'm from India and love making projects on electronics and especially with Arduino.

DIY Solid State Relay