How to use a high current solenoid with Arduino

How to use a high-current solenoid with Arduino
So you have a solenoid that you want to use as an electric door lock, or some other kind of actuator with your Arduino. But, here's the problem: too high a current for the Arduino to source, and too high of a voltage to drive.
Well fear not, using a simple transistor we can set up the solenoid to work hand in hard with your arduino. If you are interested in purchasing this solenoid, there is a link in the description of my Slow Boat from China #8 video.
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Please watch: "Diodes: The basic building block of all digital circuits"
• Diodes: The basic buil...
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