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

 

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

 

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