Created June 6, 2019 © CERN-OHL

Arduino Circuit Breaker

Circuit breaker to protect motor from overload

IntermediateFull instructions provided129

Things used in this project

Hardware components

Arduino UNO

SparkFun Low Current Sensor Breakout - ACS712

Power Relay, SPDT

Resistor 1k ohm

1N4007 – High Voltage, High Current Rated Diode

General Purpose Transistor NPN

2N2222

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Digilent Mastech MS8217 Autorange Digital Multimeter

Story

This project is based on the ACS 712 Current Sensor. As you aware that the current sensor can give the Ampere usage of a device. Mainly there are 5A, 10A, 20A and 30A current sensors are available.

1st I checked the current sensor and the way of it work. Based on the quality of the product the accuracy of the Amperage may be changed.

But, I did not consider about the accuracy. However, It was noted that the ampere usage of a motor is changed when motor is blocked than it is being functioned.

That method is used to make this Circuit Breaker. You can see the details from the video below.

Accordingly, When the device is powered, "HIGH" signal sent to the arduino pin and as the relay of, the motor is also on, And then the motor is blocked, we Arduino take the current level and send a "LOW" signal to the arduino pin and trigger off the relay. Then motor stops.

Code

Arduino Circuit Breaker

int Crnt = A0; 
float voltage;
int anval;
int relay = 12;
float amps;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(Crnt,INPUT);
pinMode(relay,OUTPUT);
digitalWrite(relay,HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
anval = analogRead(Crnt);
voltage = (anval/1024.0)*5000;


  amps=((voltage-2490)/66);
  Serial.print("amps : ");
 Serial.println(amps);
  delay(150);
if (amps < 0){amps =amps*-1;}

  if (amps >.8){// When hold the motor, it takes a current more than 800mA.
    digitalWrite(relay,LOW);delay(1000);}

}

Credits

SetNFix

17 projects • 35 followers

I am an accountant in profession but, I would more prefer to work with electronics based innovations.

Contact

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Arduino Circuit Breaker

Arduino Circuit Breaker

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Schematics