Materials and tools:
- Baby jar
- LED (varying colors and sizes)
- Coin cell battery (CR2032)
- Battery holder
- Tilt switch (we found our tilt switch at Adafruit)
- Double stick tape
- Soldering iron and solder
Given the age level of this group (3rd through 6th grade) I opted to do the soldering myself. However, over time I can see this task being taken on by students with proper training and practice.
The build is fairly simple. The coin cell battery, LED and tilt switch make up a simple circuit. I pre-soldered the tilt switch and battery holder before class and waited until students chose an LED color before completing the soldering points. Here's what the final circuit looks like, taped to the underside of the baby jar. While the tilt switch has two leads, I used one to attach the LED, but bent the other back and soldered the bottom of the switch to the battery holder instead. The bottom of the switch, therefore, functions as the other lead.