Each servo motor requires a PWM signal to control its position, and with 28 servos needed for the clock, the Arduino Mega’s capacity was quickly exceeded.

The clock’s electronics rely on an Arduino. The issue with an Arduino, of course, is that the time base isn’t always good enough to keep time over long periods.

This solar tracker system uses the Arduino UNO board, a servomotor, 2 LDRs and 2 resistors to rotate the solar panel towards the Sun or a source of light.

You'll need an Arduino, of course, and you'll also need a pair of laser pointers, a few servos and motors to make the lasers move as time passes, and of course, the IKEA BLANDA salad bowl ...