Kurt Andro’s Overhead Alarm Clock is thoroughly documented (and that’s an understatement!), complete with credits, license, step-by-step photos and text, Bill of Materials, patterns, inserts, Fritzing files – and more! I wish all (or at least most) projects were documented this thoroughly – it really provides one with the ability to see how this project was built, and therefore make decisions about how you might alter or change the design for any reason (it’s also just really good documentation!).
The device is intended for use in living rooms, especially bedrooms.
It should not be exposed to increased humidity (such as in bathrooms), direct sunlight or mechanical loads such as bumps, etc.
There are no hazardous voltages in the housing. The Arduino is powered by USB cable.
The power bank at the other end of the USB cable is in turn supplied by a 5-volt switching power supply, which in turn in a socket (in Germany 230 volts / 50 hertz) inserted. Only this part carries mains voltage.
It must be ensured that both the power supply and the power bank remain free of dust and objects (blankets, stuffed animals, magazines, etc.) that could hinder their heat dissipation. Otherwise there is a risk of fire!
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.