Arduino Relay Transistor Diode
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Transistor acts as a switch to control the 12v to relay coil.
Arduino relay transistor diode. 1 x sharp pc817 optocoupler. We have connected transistor base to arduino pin a0 through a 1k resistor. The parts you will need. 2 x 220ω resistors.
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. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.
The picture above shows the circuit you need to build. An ac bulb is used for demonstration. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. 1 x 1n4001 diode.
Below given is relay driver circuit to build your own relay module. Just a simple circuit that contains our transistor diode resistor and of course the relay. Therefore we need a device to amplify the current. Resistor adjusts input current from arduino to the transistor.
The following arduino program completes the post. Arduino tricks is the online education platform which teaches students every day that too completely free of cost. B sc engineer in electrical and electronic engineering. 1 x tip120 darlington transistor is recommended but any one that will handle your relay will work.
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. Connections to the household appliance are not shown. The optocoupler is the most important part it isolates the circuit from the relay using. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.
Diode acts as a protection for transistor against back emf induced through relay coil during transit conditions. The design of the circuit is described here. Circuit diagram and working.
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