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 the arduino having its output of the relay connected to a solenoid valve. Since I am not confident in relays, does anyone k…

tnx for reply... but my relay is a SSR and does not have any coils in it. I have searched the forums and there were queries on this topic. My question is if I can connect the SSR to the digitla pins without having any current limiting resistance, and if any how do I calculate that impedance? Tnx

the REALLY Good part of the SSR's is that they have been designed to operate directly from logic level outputs! you dont need any extra circuitry yo run it ( atlest it wont get damaged :wink: )

But I found out that the arduionos pins limit is 40mA . how can I know that I wont fry it or something? The SSR link used is in the first post. tnx

A better datasheet is this http://datasheet.octopart.com/MPDCD3-B-Crydom-datasheet-123962.pdf As one can see the Typical Input Current @ 5Vdc [mA] is 2.6A. How can I know if I wont fry anything? Tnx

As one can see the Typical Input Current @ 5Vdc [mA] is 2.6A. :slight_smile: well it was written like this .. Typical Input Current @ 5Vdc [mA] 2.6 that is not 2.6A but 2.6 mA :wink:

Yes yes my mistake. hehe i just got it to work, since I connected the relay to a bulb and programed it to switch on and of... Now the next step is to connect it to a solenoid valve. tnx

Good but when playing with relays do look at the maximum current requirements you need atleast a relay capable of doing double the switching than you require :wink:

SSRs are Mity Fine. No problem on driving the SSR right off a pin... which you already proved using a bulb as SSR load. An old fashion tungsten bulb is a tame load, you might wanna look at one other thing before you try to kerchunk the solenoid. A solenoid has inductive "kick" and has the same issu…

hi I was searching for some hint for my project, and hope maybe I can get some answer from this thread. Is heating element considered an inductive power? I am actually using a PIC micro-controller to switch on/off a heating element every 1/8 seconds. and I am getting garbage signal through the digi…

Interfacing a SSR relay to the arduino

Forum 2005-2010 (read only) General Frequently-Asked Questions

robtillaart December 23, 2010, 12:14pm 2

check this thread - http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1221230237/13 might solve your questions.

and the playground - Arduino Playground - HomePage

Topic		Replies	Views
Wiring a solid state relay to Arduino General Electronics	16	7894	June 19, 2024
Controlling multiple outlets with SSR Relay module and Arduino General Guidance	20	977	September 11, 2024
Needing help with crashing Arduino by using a relay General Electronics	43	283	August 24, 2025
SSR relay weird behavior General Electronics	7	529	June 10, 2023
Relay for heating element keeps getting destroyed Motors, Mechanics, Power and CNC	24	604	November 19, 2024

Interfacing a SSR relay to the arduino

Related topics