littleBits i11 pressure sensor

Squeezing the pad harder really does send more signal, which is way more fun than a plain on/off button. My kid spent an hour pressing it lighter and harder to dim and brighten the lights on his little circuit.

I grabbed this pressure sensor to let my kid squeeze a soft pad that ramps up the vibration motor, and the way it responds to how hard you press is genuinely fun. The pad needs a firm press to really send a strong signal, which I didn't expect at first. It's become the most-used bit in our kit.