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It requires a high speed processor and more RAM than the Arduino has
Real time clock (RTC) keeps the time going even when the Arduino is unplugged
good for larger scale installations
5A Linear voltage regulator - 7805 TO-220
Please note: The processor has completely changed on the new RaspberryPi 2 v1
Lock-style Solenoid - 12VDC ftdi It requires a high speedSolenoids are basically electromagnets: they are made of a big coil of copper wire with an armature (a slug of metal) in the middle. When the coil is energized, the slug is pulled into the center of the coil. This makes the solenoid able to pull from one end. This solenoid in particular is nice and strong, and has a slug with a slanted cut and a good mounting bracket. It's basically an electronic lock, designed for a basic cabinet or safe or door.
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