Measuring only 36mm square, the digital dice makes an excellent project for exploring enclosure design and microcontroller programming.  With this PCB, pupils can design and make very high quality outcomes.

The dice is powered by a single 3V CR2032 cell mounted on the reverse side of the PCB.  A surface mount PICAXE08M monitors an onboard light sensor and controls the display.  The PIC can be programmed to produce light displays and random numbers triggered by placing a hand over the light sensor.

Although the PCB can be assembled using a soldering iron, it is much easier to use solder paste and a toaster oven.

The computer programming lead is connected to the dice PCB using a small adapter (available separately) which converts from 3.5mm jack to 3 way turned pin header.