Relay Shield

This Relay Shield from Evil Mad Scientist is a simple Arduino add-on that gives your Arduino the ability to control a single electromechanical relay for switching loads of up to 24VDC or 40VAC. Each Relay Shield comes equipped with a single pole - double throw (SPDT) sealed relay which can handle a current load of up to 5A. This means that when current is applied to the coil it throws a simple changeover switch, terminating the connection from the NC (Normally Closed) contact to ground and closing the NO (Normally Open) contact. Use them to switch high voltage/high current devices. As this is a shield, it is powered straight from the 5V power supplied by your Arduino, simply slide it into your Arduino or shield-compatible board (like the RedBoard) and you will be good to go!

The relay shield is controlled through pin Digital 4 on your Arduino via a transistor labeled "Q1". When output Digital 4 on your Arduino is low, the relay shield will connect the NC pin to the "Common" pin of the screw terminal. When output Digital 4 goes high, the “Coil On?” LED will light up and the relay shield will instead connect the NO pin to the "Common" pin of the screw terminal.

The Relay Shield is sold as an easy-to-assemble kit and includes everything listed below with clear assembly instructions listed in the documents section.

  • 1x Relay Shield PCB
  • 1x GSLA SPDT 5A Relay
  • 1x Red LED, 3mm
  • 1x 100uF 10V Capacitor
  • 1x 0.1uF 25V Capacitor
  • 1x 2N4401 Transistor
  • 1x Screw Terminal, 3-pos
  • 1x Arduino Header Set
  • 2x 1000 ohm 1/4W Resistor
  • 2x 1N5817 Diode

Relay Shield Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

2 Soldering

Skill Level: Rookie - The number of pins increases, and you will have to determine polarity of components and some of the components might be a bit trickier or close together. You might need solder wick or flux.
See all skill levels


Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.

1 DIY

Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
See all skill levels


Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
See all skill levels


Comments

Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

Customer Reviews

2 out of 5

Based on 2 ratings:

Currently viewing all customer reviews.

What a mess!

Ordered 3 kits. -One came pre-assembled but looked like it had been soldered with a candle. So bad it will almost certainly fail in field, bad soldering, poorly cut wires etc -One came missing one part -One was fine

Who knows how this happened but it was a major disappointment.

Hi, No kits should be pre-assembled. It sounds like a return that managed to get back into our inventory. We would not resell that item intentionally. I'll be in contact with you directly to help resolve this matter. Thanks

Newer Version?

The pictures above must have been for an older version than the one I received because, while the boards do look very similar there is one extra part and one extra slot for it to go.

I ordered this because I'm new to this hobby and still learning the basics. So I have no idea what this extra part is or does since there are no instructions for it.

Hi, I'm sorry, our supplier upgraded us to V2 without letting us know. You received the new Version 2 model. We are working to get the documentation and information related to that version and you will be able to find it here as soon as we have it -- https://www.sparkfun.com/products/13769