How To Interface Relay With Arduino

A Relay is an electromagnetically operated switch. Relays are used to control a circuit. Many relays consist a coil, a yoke, and an armature. When a current is passed through the coil, a magnetic field is induced in the coil which moves the armature and relay start its switching function. A normal relay has NO(normally open), NC(normally connected), COM and coil pin within it. A Simple one channel relay is shown in below image
relay driver interfacing
Relay
Required Components
For designing a relay driver circuit you will need following components 
  • Relay
  • 1N4007 Diode
  • BC547 Silicon NPN transistor
  • 10K Resistor 
Circuit Diagram
A simple relay driver circuit is shown in below image. Here we use an NPN BC547 transistor to drive the relay.Base current ought to be a lot of enough to turn on a transistor. A diode 1N4007 use among the circuit to protect the transistor from damage due to back emf. When relay is in off state, COM pin of 

circuit diagram of relay driver
Relay Driver Circuit 
a relay is connected to NC(normally connected) pin and when a small current start flows through relay coil then COM pin is connected to NO(normally open) pin.

 NOTE: Change +5V  to +12V in the circuit 

Code for relay testing is same as for blink an LED so learn  how to blink an LED and test your relay driver circuit. Now using relay make some more cool projects using arduino like control your AC home appliances, turn ON/OFF a bulb and many more.

Hope you like this article and give your valuable feedback by commenting below or if you have got any problem then also comment below. 

Comments

Post a Comment

Popular posts from this blog

How to Remove �Powered by Blogger� attribution From Blogspot Blog?

Image
                     Blogger initially add on every blog �Powered by Blogger" in Blogger footer. This dialogue called Attribution 1. It is optional and used to show copyright, credits and other information. You can remove this attribution widget and add your own information. Blogger not allow you directly to remove it because it is locked. If you have tried to remove this then you may of noticed this gadget is locked into you blog. There are three ways of removing "Powered by Blogger" from your BlogSpot blog. Method 1:  Using Unlock method Step 1. Log in to your Dashboard and go to your Blogger Dashboard. Step 2. Now go to Template > Edit HTML. Step 3. Tick the "Expand Widget Templates" checkbox. Step 4. Now Search (CTRL+ F) the following code: <b:widget id='Attribution1' locked='true' title='' type='Attribution'> Step 5. Replace true with false <b:widget id='Attribution1' locked='false' title='
Read more

Fritzing: an Electronic Design Automation software

Image
Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to take the step from physical prototyping to actual product. We are creating this software in the spirit of Processing and Arduino, developing a tool that allows users to document their Arduino and other electronic-based prototypes, and to create a PCB layout for manufacturing. The complementing website helps users to share and discuss drafts and experiences as well as to reduce manufacturing costs. Fritzing is essentially an Electronic Design Automation software with a low entry barrier, suited for the needs of designers and artists. It uses the metaphor of the breadboard, so that it is easy to transfer your hardware sketch to the software. From there it is possible to create PCB layouts for turning it into a robust PCB yourself or by help of a manufacturer. Why Fritzing is needed Physical prototyping tools have come a long way and already allow non-engineers to quickly turn their ideas in
Read more