EMSL’s Simple Relay Shield

Technology
EMSL’s Simple Relay Shield

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.

6 thoughts on “EMSL’s Simple Relay Shield

  1. Jason Bryans says:

    “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. Windell Oskay says:

    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. Matt says:

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

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