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