This project is aimed for beginners, but can be reproduced by anyone! The circuit consists of a coin cell battery powering an LED, but is resisted by a sensor of your choice.
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Step 1: Materials
--20mm coin cell (Sparkfun, Radioshack)
--20mm coin cell holder (Sparkfun, Radioshack)
--3mm LED (Sparkfun, Radioshack)
--Copper tape (Sparkfun, Amazon) or conductive ink (Bare Conductive)
--Card stock paper or thin cardboard (I am using card stock throughout this instructable)
--Hobby knife or scissors
--Multimeter (optional, for debugging)
Sensors (there are many possibilities):
--Photocell (Sparkfun, Radioshack)
--Flex sensor (Sparkfun)
(The description of each sensor is in the next step, or check sparkfun for a better one.)