Connecting relay to a processor and to a solenoid valve

Discussion in 'General Electronics Chat' started by hellsnomad, Dec 23, 2010.

  1. hellsnomad

    Thread Starter New Member

    Dec 23, 2010
    1
    0
    Dear all, part of my project is having to OPEN/CLOSE a gas cylinder and so I decided to use a solid state relay - http://www.crydom.com/en/Products/Catalog/m_p.pdf connected to a microcontroller (arduino mega) having its output of the relay connected to a solenoid valve. Since I am not confident in relays, does anyone know if I can just connect the relay to a digital pin, giving it a HIGH or LOW?

    I dont know if there can be any Back EMF generated or if I have to coinnect any electronic circuit before the relay.

    Thank you
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    The input is just an LED and 1.5KΩ resistor in series. The (-) input goes to your digital ground and (+) input can be connected directly to your controller's output pin. OR...the (+) input goes to your digital +5V and (-) input can be connected directly to your controller's output pin.

    Ken
     
    Last edited: Dec 23, 2010
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,753
    760
    Solid state relays have no back EMF and shud be isolated.

    Coil relays produce back EMF

    Which one do you prefer. Cause any can be driven with logic levels
     
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