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