Published December 8, 2024 © LGPL

DIY Relay | Make Relay From Servo Motor | Arduino Servo Moto

This relay is made using servo motor. I wanted to control a DC motor with a microcontroller but I didn't have a relay so I made one

BeginnerFull instructions provided4 hours76

DIY Relay | Make Relay From Servo Motor | Arduino Servo Moto

Things used in this project

Hardware components

Arduino UNO

SG90 Micro-servo motor

Geared DC Motor, 12 V

9V 1A Switching Wall Power Supply

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Breadboard, 830 Tie Points

Story

Full Video Demonstration

Introduction

I wanted to control a DC motor with a microcontroller but I didn't have a relay so I made one using a servo motor instead.

I have a DC motor which is rated for 24V. To control it with a microcontroller I either need a relay or an H bridge motor driver IC. But I didn't have those. used this servo motor which will act as a relay or a switch. It will complete the circuit or break the circuit similar to a relay or a switch.

Servo Motor as Relay

What is a Relay?

24V Relay

This is a 24 Volts relay, it connects its contacts when powered with 24 volts. It can be used to control the motor. But we didn't use it.

Circuit Schematic With SPDT

Circuit Schematic With Relay

This is what the circuit would have looked like if we had used a SPDT relay. But we used the servo instead and now it looks like this.

Real Design

Real design of relay

This is the real circuit, here we have a wire attached to the horn of the servo which is extended. When this arm rotates then this wire touches the metal strip completing the circuit. Arduino uno will be sending the commands to the servo motor and all the wiring and connections are done on the breadboard for quick prototyping.

Applications & Limitations

This type of relay can be used to control any device with any voltage we have to enclose and secure this setup and we also have to take care of the sparks that get generated during connection and disconnection, these sparks damage both the connecting metallic parts. So using solid-state & transistor-based relays or switches like mosfets/igbts is better.

Custom parts and enclosures

Sketchfab still processing.

Schematics

Code

Code To Control Servo Motor; Which Will Control DC Motor And Act as Relay

#include <Servo.h>
int pre,curr = 90; // servo position angle
int i; 
Servo myservo; 

void setup() {
  myservo.attach(10);  // attaches the servo on pin 9 to the servo object
  Serial.begin(9600);
  myservo.write(curr);
}

void rotate(int angle){
  if(angle>curr){
    for(i=curr;i<angle;i++){
      myservo.write(i);
      delay(10);
    }
    curr = angle;
  }else if(angle<curr){
    for(i=curr;i>angle;i--){
      myservo.write(i);
      delay(10);
    }
    curr = angle;
  } 
}


void loop() {
    
    while (Serial.available() > 0) {
      char a = Serial.read();

      if (a =='w'){
        Serial.println("Contact");
        rotate(105);
        delay(150);
      }else if (a =='s'){
        Serial.println("No Contact");
        rotate(60);
        delay(150);
      }if (a =='m'){
        Serial.println("Stand By");
        rotate(85);
        delay(150);
      }
    }
}

Credits

Robotics EveryDay

3 projects • 9 followers

DIY Relay | Make Relay From Servo Motor | Arduino Servo Moto

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Full Video Demonstration

Introduction

What is a Relay?

Circuit Schematic With SPDT

Real Design

Applications & Limitations

Custom parts and enclosures

Servo Motor With Metalic Link

DC Motor To Be Controlled

Schematics

Circuit Schematic With SPDT Relay

Circuit Schematic With Servo Motor

Code

Code To Control Servo Motor; Which Will Control DC Motor And Act as Relay

Credits

Robotics EveryDay

Comments

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DIY Relay | Make Relay From Servo Motor | Arduino Servo Moto

DIY Relay | Make Relay From Servo Motor | Arduino Servo Moto

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Full Video Demonstration

Introduction

What is a Relay?

Circuit Schematic With SPDT

Real Design

Applications & Limitations

Custom parts and enclosures

Servo Motor With Metalic Link

DC Motor To Be Controlled

Schematics

Circuit Schematic With SPDT Relay

Circuit Schematic With Servo Motor

Code

Code To Control Servo Motor; Which Will Control DC Motor And Act as Relay

Credits

Robotics EveryDay

Comments

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