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.
Arduino transistor relay.
The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide.
We have connected transistor base to arduino pin a0 through a 1k resistor.
The optocoupler is the most important part it isolates the circuit from the relay using.
The coil of the relay needs a large current around 150ma to drive the relay which an arduino cannot provide.
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.
2 since an arduino pin sources max 25ma the relay cannot be switched directly from the arduino pin.
2 x 220ω resistors.
Working of the project.
1 x sharp pc817 optocoupler.
1 x 1n4001 diode.
Con questo video imparerai a collegare un transistor bipolare ad arduino per pilotare un relè.
Nel video spiego sia il circuito che lo sketch necessario.
The picture above shows the circuit you need to build.
Circuit diagram and working.
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.
The parts you will need.
An ac bulb is used for demonstration.
In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated.
1 x tip120 darlington transistor is recommended but any one that will handle your relay will work.
In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor.
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.
The working of the project is based on the functioning of the relay and the ability of arduino to.
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.