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This compactly designed power supply uses STM32 microcontroller to compute the power supply output voltage and load current, and display these parameters on a RGB OLED display. The input to this power supply is a 24V DC , and the output can be varied from 0V to 24V at 0A to 3A.
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The old resistor decade boxes consisted of a bunch of rotary switches which make them little bulky and expensive. Stynus has built this microcontroller-based resistor decade box that uses one rotary encoder and 16 relay switches to switch on the various resistances. The microcontroller used in this project is PIC16F84A.
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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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