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Control High-power Circuits with an Arduino Reply 2017-02-04 07:49:17
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Henrik Wessel

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To control high-voltage or high-power circuits with an Arduino, you have to isolate them from the Arduino with a relay. Here's how!
Circuits that operate at high voltages or at high currents cannot be controlled directly by an Arduino. Instead, you use a low-voltage control signal from the Arduino to control a relay, which is capable of handling and switching high-voltage or high-power circuits. A relay consists of an electromagnet that, when energized, causes a switch to close or open. Relays provide complete electrical isolation between the control circuit and the circuit being controlled.
A relay typically has five pins:
  1. Coil input pin1. This is generally connected to the positive terminal of your signal source.
  • Coil input pin2. This is generally connected to the negative terminal of your signal source.
  • Normally Open pin(NO). This pin is normally not connected to the common pin, it is connected when the relay is activated.
  • Normally closed pin(NC). This pin is normally connected to common pin and is disconnected when relay is activated.
  • Common. In most of the cases, this pin is connected to the ground of the source we use to drive the appliance.
  • Contactor
    Experiment
    In this tutorial, we will drive a 12V DC motor using relays.
    Hardware Required
    • 1 x 12 VCD power supply
    • 1 x 12V DC motor
  • 1 x relay
  • 1 x Arduino Mega2560
  • 1 x NPN transistor
  • 1 x Diode
  • 1 x jumper wires
  • Wiring Diagram
    The circuit shown in the diagram below uses a relay to switch 12 V across a DC motor. To turn on the motor, the program writes a HIGH value to pin 3, which turns on the transistor. When the transistor turns on, current flows through the relay coil causing the relay to close, which connects 12 V across the motor, causing it to spin.
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    Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

    kalman.kovacs

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    I like checking your post and hope your update comes soon.
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