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Never forget to feed your fish again with this DIY fish feeder, which is Arduino controlled and can be programmed to automatically feed the fish at a fixed interval of time. It uses a servo motor to release the food from a container into the aquarium when it’s time to feed the fishes.
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This DIY tachometer uses optical sensing to compute the rotational speed of a rotating object and displays the speed on an LCD display. It is Arduino-based project and can measure RPM over 20K.
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This Bluetooth-controlled door lock, named The Bean Lock, is built around an electronic wireless deadbolt and is controlled by the LightBlue Bean, which is an Arduino compatible microcontroller that is programmed wirelessly over Bluetooth Low Energy so that it can be reprogrammed even after it’s been placed in to the project.
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This Cassette Tape MP3 player is built by embedding an inexpensive USB MP3 player inside an audio cassette. Miniature switches are implemented to use the cassette tape wheels as control switches for selecting the songs and adjusting the volume.
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This Instructable describes how to build your own persistence-of-vision (POV) clock using Arduino and the motor salvaged from an old hard drive. A small cut made on the one of the disks along with an optical sensor arrangement is used for precise positioning and timing of the rotating disk, which is the key in the operation of any POV based display.
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