Transistor is used to amplify the current so that full current (from the DC source – 9v battery) can flow through a coil to fully energies it. The relay is always configured by using a small Driver circuit which consists a Transistor, Diode and a resistor. Relays are available in many ratings, here we used 6V operating voltage relay, which allows 7A-250VAC current to flow. When there is some voltage applied to the coil, the electromagnetic field produced, which attracts the Armature (lever connected to spring), and COM and NO (normally open contact) gets connected, which allow a larger current to flow. When there is no voltage applied to the coil, COM (common) is connected to NC (normally closed contact).
Commonly used Relay is Single Pole Double Throw (SPDT) Relay, it has five terminals as below: A relay is a good example of controlling the AC (alternate current) devices, using a much smaller DC current. Means by applying small current we can switch ON the relay which allows much larger current to flow. Relay is an electromagnetic switch, which is controlled by small current, and used to switch ON and OFF relatively much larger current. Here we are not using any Relay Driver IC like ULN2003 and will only use an NPN transistor to control relay.
CONTROL HIGH VOLTAGE DEVICES ARDUINO RELAY TUTORIAL HOW TO
So in this arduino relay control tutorial we will simply learn How to interface a Relay with Arduino. Whenever we need to connect any AC Appliance in our embedded circuits, we use a Relay. So today we are here with the same project but here we will use an AC bulb instead of normal LED and will blink an AC bulb. In which we blink an LED with having some delay. LED Blinking is a very common and almost first program for every embedded learner or beginner.
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