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There’s so much to love about this project! Lenore and Windell crush it again.

The Evil Mad Scientist Simple Relay Shield is an Arduino add-on that lets you use your Arduino (or shield-compatible clone, such as the Diavolino) to control a single electromechanical relay, for switching loads of up to 24 V DC or 40 V AC, at up to 5 A of current. The relay is an “SPDT” type, meaning that it can be used either as a normally-open or normally-closed relay, so that you can choose to either switch on or switch off your load when the output signal from your Arduino is high. When operated as a normally-open relay, it is capable of handling loads up to 10 A.

John Baichtal

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net


3 Responses to EMSL’s Simple Relay Shield

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  1. “When operated as a normally-open relay, it is capable of handling loads up to 10 A.”
    Doesn’t the board say “DO NOT EXCEED … 5A” ?

  2. Indeed. It was going to read “DO NOT EXCEED … 5A UNLESS YOU’VE READ THE INSTRUCTIONS AND ARE SURE THAT YOU’VE CONNECTED IT CORRECTLY IN THE ONE MODE THAT CAN ACTUALLY HANDLE 10 A,” but it didn’t fit. ;)

  3. according to the relay’s datasheet, it has “High switching power: 10A @ 250VAC”. Is the 40VAC 10A rating a weakness of the PCB?

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