Getting started with arduino Part IV

You now this click clack noises for exmple from your car if you want to turn right or left, yes right I mean relay. This will be the stuff that describe in this post, controlling circuits with a relay.

I used the following relay in my examples:

Power Relay V05SKT – Datasheet
Maximum Switching Current 5 Ampere
Maximum Switching Voltage 250 VAC, 150 VDC
Minimum Switching Load 3 Volt or 5 V at 100mA
High insulation with reinforced insulation system (between coil and contacts)

Relay schematic:

Coil connection: 1 and 4
Current connection: 2 and 3

You can find the coil by the mark on the side of your relay case or by line on the top of your relay. Another way: you try to measure the electrical resistance with a multimeter – Ω position, only the coil can be measured by the digital multimeter.

Arduino INO Code:

int RelayPIN = 12;
 
void setup()
{
     pinMode(RelayPIN, OUTPUT);
}
 
void loop()
{
     digitalWrite(RelayPIN, HIGH);
     delay(1000);
     digitalWrite(RelayPIN, LOW);
     delay(1000);
}

Pin 12 will be used for switching load, and will be connected to the coil, it doesn’t matter where is plus and minus.

To protect the arduino arduino board I used a diode: