Arduino Relay Transistor Diode

The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. The picture above shows the circuit you need to build. Circuit diagram and working.

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The parts you will need.

Arduino relay transistor diode.

The project is used to demonstrate the high voltage driving capabilities of a relay using arduino uno. 1 x 1n4001 diode. The base terminal of the 2n2222 transistor is connected to any of the digital i o pin of the arduino through a 1kω current limiting diode in this project base is connected to pin 7 of arduino. An ac bulb is used for demonstration.

B sc engineer in electrical and electronic engineering. Transistor acts as a switch to control the 12v to relay coil. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. Diode acts as a protection for transistor against back emf induced through relay coil during transit conditions.

We have connected transistor base to arduino pin a0 through a 1k resistor. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. Resistor adjusts input current from arduino to the transistor. Arduino board jumper wires breadboard.

The design of the circuit is described here. Just a simple circuit that contains our transistor diode resistor and of course the relay. 2 x 220ω resistors. 1 x sharp pc817 optocoupler.

1 x tip120 darlington transistor is recommended but any one that will handle your relay will work. The following arduino program completes the post. The following picture depicts how to connect the different parts using a solderless breadboard jumper wires a transistor a diode a relay a push button and two 10k resistors. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.

Arduino tricks is the online education platform which teaches students every day that too completely free of cost. The optocoupler is the most important part it isolates the circuit from the relay using. Below given is relay driver circuit to build your own relay module. Therefore we need a device to amplify the current.

In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor. Therefore we need a device to amplify the current. Connections to the household appliance are not shown.

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Source : pinterest.com

Arduino Relay Transistor Diode

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