Nel video spiego sia il circuito che lo sketch necessario.
Arduino transistor relay.
Con questo video imparerai a collegare un transistor bipolare ad arduino per pilotare un relè.
1 x 1n4001 diode.
Circuit diagram and working.
We have connected transistor base to arduino pin a0 through a 1k resistor.
Arduino board jumper wires breadboard.
Therefore we need a device to amplify the current.
1 x sharp pc817 optocoupler.
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 working of the project is based on the functioning of the relay and the ability of arduino to.
Therefore eg a transistor bc547 or 2n2222 etc should be used search in google for more details and sample circuits for switching the relay.
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.
An ac bulb is used for demonstration.
2 since an arduino pin sources max 25ma the relay cannot be switched directly from the arduino pin.
2 x 220ω resistors.
The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide.
Working of the project.
1 x tip120 darlington transistor is recommended but any one that will handle your relay will work.
The picture above shows the circuit you need to build.
Below given is relay driver circuit to build your own relay module.
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.
The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide.
A simple project in which arduino uno controls a 5v relay is explained here.
Therefore we need a device to amplify the current.
The parts you will need.
In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.