Arduino Relay Transistor Diode

1 x tip120 darlington transistor is recommended but any one that will handle your relay will work. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. The project is used to demonstrate the high voltage driving capabilities of a relay using arduino uno.

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2 x 220ω resistors.

Arduino relay transistor diode.

The optocoupler is the most important part it isolates the circuit from the relay using. Resistor adjusts input current from arduino to the transistor. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. Arduino tricks is the online education platform which teaches students every day that too completely free of cost.

The design of the circuit is described here. Just a simple circuit that contains our transistor diode resistor and of course the relay. Therefore we need a device to amplify the current. The following arduino program completes the post.

B sc engineer in electrical and electronic engineering. Circuit diagram and working. 1 x 1n4001 diode. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.

In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor. Connections to the household appliance are not shown. 1 x sharp pc817 optocoupler. Arduino board jumper wires breadboard.

The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. Transistor acts as a switch to control the 12v to relay coil. 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. Therefore we need a device to amplify the current.

Below given is relay driver circuit to build your own relay module. The parts you will need. The picture above shows the circuit you need to build. Diode acts as a protection for transistor against back emf induced through relay coil during transit conditions.

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. We have connected transistor base to arduino pin a0 through a 1k resistor. An ac bulb is used for demonstration.

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Arduino Relay Transistor Diode

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10 Sec To 30 Min Time Delay Circuit With Relay Transistor Eleccircuit Com Basic Electronic Circuits Electronics Circuit Simple Electronic Circuits

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2 x 220ω resistors.

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