Arduino Relay Transistor Diode

The design of the circuit is described here. The parts you will need. 1 x sharp pc817 optocoupler.

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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.

Arduino relay transistor diode.

Transistor acts as a switch to control the 12v to relay coil. Below given is relay driver circuit to build your own relay module. 2 x 220ω resistors. We have connected transistor base to arduino pin a0 through a 1k resistor.

The following arduino program completes the post. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. 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.

An ac bulb is used for demonstration. B sc engineer in electrical and electronic engineering. Arduino board jumper wires breadboard. Resistor adjusts input current from arduino to the transistor.

Connections to the household appliance are not shown. Arduino tricks is the online education platform which teaches students every day that too completely free of cost. 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.

Just a simple circuit that contains our transistor diode resistor and of course the relay. The optocoupler is the most important part it isolates the circuit from the relay using. 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.

1 x 1n4001 diode. 1 x tip120 darlington transistor is recommended but any one that will handle your relay will work. In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide.

Therefore we need a device to amplify the current. Therefore we need a device to amplify the current. Circuit diagram and working.

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Source : pinterest.com

Arduino Relay Transistor Diode

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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.

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