diy relay module

I If you want a relay module and you are thinking that you will buy it online here is a link : relay module
but as you see it is expensive i will tell you a very cheap DIY

material needed:-

  • vero board/prototyping board
  • relay 12v
  • diode 40001 or 40007
  • bc558 transistor
  • 9volt battery
  • male header pin or simple wire for connecting
place all the thing on the veroboard as shown in picture or in schematic or in video
breadboard view

schematic picture

connect signal to desired pin of arduino 
and ground to ground pin of arduino
and don't forget to connect 9volt battery


if it is not working check the diode position and transistor position and also see ground connections


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