The old-fashioned alarm clock was a staple of cartoons in years past, with loud clanging bells and slap-to-shutoff functionality. Despite being an excellent dramatic device, these classic timepieces began to lose favor to the digital clock radio, and, in more recent times, the smartphone alarm. However, [LenkaDesign] has come up with this excellent build that combines the best of the old and the new.
The build starts with an old alarm clock. The clockwork internals are removed, but the bells remain, powered instead by a brushed DC motor. An Arduino Nano is the brains of the operation, interfacing with the now-ubiquitous temperature, humidity and barometric pressure sensors. Time is displayed on a Nokia 5110 LCD screen of the type popular a decade ago when options for small hobby project displays were significantly more limited then they are today.
As a nice touch, an old circuit board lends a new face to this clock, with a trio of big chunky buttons to act as controls. The LCD uses attractive icons to help convey information, making the most of the graphical capabilities available. There’s even a rudimentary weather forecasting algorithm that uses barometric pressure changes to predict the likelihood of rain.