This is was my first time using an Arduino or wiring anything. Unfortunately, all the materials used were not mine so I couldn't make it permanent. However, I though it was an effective, albeit expensive, way to make a bear react to a belly squeeze. It would also make an adorable gift if you had a little extra money and could maybe add sound.
What you'll need.
-Arduino (If this was permanent I would suggest something other than the MEGA)
-thread and needle
-hammer and nail
-something clear and plastic
-batteries or power source
Step 1: Find a Stuffed Animal
I would suggest something with a belly to squeeze. The whole point is that its react well to the natural belly squeeze. It also has to be big enough to house the flex sensors, Arduino, and batteries. I would just make sure its big enough that an Altoid can could fit inside it with enough room to not be too noticeable.