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This Arduino Solenoid Tutorial shows how to control a solenoid using pushbuttons and a relay with your Arduino compatible controller. Solenoids are electromagnetically driven actuators. When voltage is applied to the solenoid coil the electromagnetic force pulls the center plunger in. It is an excellent mechanical solution for all kinds of DIY projects requiring short quick linear actuation. Solenoids are most often found in latching and trigger-like mechanisms, such as door locking systems, paintball guns, pinball machines, dot matrix printers, and fuel injectors. Let's get started.

Step 1: Project Parts List

These are the parts recommended to follow through the tutorial while it is possible to complete this tutorial with other parts (or less parts, as in a single solenoid, relay, and pushbutton), and the concepts learned in this can be applied to other relays, solenoids, and Arduino compatible boards and shields, we recommend these parts for the easiest transfer of this knowledge.

I'm having the hardest time with this and have no idea why. It's like my relay has a mind of its own. I've tried 2 different modules. With both codes I get the same result. The relay switches on and off without pressing the button at all and only works with the button randomly, about 25% of the time
<p>Could you post a picture of your setup somewhere so we can see the wiring? It sounds like it's taking a floating value from a pin that isn't connected properly.</p>
Very nice tutorial! The setup is simple and the comments in the code makes it easy to understand. I have read that solenoids (and general devices with coils, motors etc.) can damage the circuits when they are turned off. Because of a voltage drop or reverse current I think. A diode close to the solenoid is then used to protect the circuits. Is this applicable in your setup or will the relays act as protection?
<p>Very nice job. I appreciate the effort gone into making this tutorial</p>
<p>Thank you! We're doing everything we can to demystify technology. </p>
<p>A good way to control the speed and force of a solenoid is to use a dashpot to regulate the speed of the stroke, this is what arc lamps use when the solenoid advances the rod to re- establish the burn, if it moves too fast the arc can be extinguished, the dashpot ensures reliable re- ignition.</p>
<p>This is useful information, and sound advice! Thank you for sharing.</p>
<p>You're welcome, this I found out many years ago when troubleshooting and arc light machine that wouldn't re- light reliably, the manufacturer explained the dashpot component and it's important function in the machine.</p>

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