reed switch

Discussion in 'General Electronics Chat' started by manishagavde, Dec 26, 2012.

  1. manishagavde

    Thread Starter New Member

    Dec 26, 2012
    3
    0
    can someone guide me about how to select a reed switch for atmega16 microcontroller.there are reed switches with different specifications and i am confused which one to use,how to know specifications like current and voltage of reed switch which will b suitable for atmega16??
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,357
    Any reed switch will do. The ATmega16 does not care which reed switch you choose. It is the circuit connected to the reed switch that matters.

    Edit: I assumed you are using the reed switch as an input to the MCU.
     
  3. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    If, on the other hand, you are DRIVING the reed switch with the MCU, you need to select one with a coil resistance that will not overload the output of the MCU or plan on using some sort of driver to the coil. Also, don't forget back EMF protection.
     
  4. SPQR

    Member

    Nov 4, 2011
    379
    48
  5. panic mode

    Senior Member

    Oct 10, 2011
    1,318
    304
    what you describe is not a reed switch, it is a reed relay
     
  6. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Since the OP was concerned with voltage rating, I ASSUMED (wrongly) that he/she was referring to the coil, since the voltage rating of the switch element of almost any reed SWITCH would be much higher than the voltage allowable as an input to his MCU.
     
  7. manishagavde

    Thread Starter New Member

    Dec 26, 2012
    3
    0
  8. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,357
    I would connect the reed switch between the input pin and GND.
     
Loading...