Arduino Transistor Relay

A simple project in which arduino uno controls a 5v relay is explained here. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. Con questo video imparerai a collegare un transistor bipolare ad arduino per pilotare un relè.

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An ac bulb is used for demonstration.

Arduino transistor relay.

1 x 1n4001 diode. Since we need to control this relay with the help of arduino a transistor is used with an additional pin called control pin on the relay module. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. 1 x tip120 darlington transistor is recommended but any one that will handle your relay will work.

Nel video spiego sia il circuito che lo sketch necessario. Therefore we need a device to amplify the current. The detail instruction code wiring diagram video tutorial line by line code explanation are provided to help you quickly get started with arduino. 1 x sharp pc817 optocoupler.

Therefore eg a transistor bc547 or 2n2222 etc should be used search in google for more details and sample circuits for switching the relay. The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide. The working of the project is based on the functioning of the relay and the ability of arduino to. We have connected transistor base to arduino pin a0 through a 1k resistor.

Learn how to use relay with arduino how relay works how to connect relay to arduino how to code for relay how to program arduino step by step. Therefore we need a device to amplify the current. This video npn transistor based 12v dc relay control drive simple make it this type transistor is a semiconductor device used to switch electronic signals a. In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor.

The optocoupler is the most important part it isolates the circuit from the relay using. The picture above shows the circuit you need to build. Below given is relay driver circuit to build your own relay module. The parts you will need.

2 since an arduino pin sources max 25ma the relay cannot be switched directly from the arduino pin. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. Working of the project. Arduino board jumper wires breadboard.

2 x 220ω resistors. Circuit diagram and working.

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