Here's an electronic kit that's fun to build and use. The kit features a colorful label that you glue onto the PC board and 10 bright colorful LEDs to indicate your mood.
You simply rest two of your fingers on the sensors and the sophisticated “comparator” IC determines your skin resistance and lights up the appropriate rating: Blue LED= “Cool as a Cucumber”, Green LED= “Easy Going”, Yellow LED= “Warm Hearted” and Red LED= “Smokin Hot”.
The LEDs light up the rainbow in colors and more color “bands” light if your skin resistance is lower (so if the red band lights, all the other colors will be on also).
Operates on one 9V battery (not included). Size of PC board: 4” x 4 5/8”. Complete with all parts, label, PC board and instructions. Skill Level 2.