Octopus Electronic Bricks! You can use them build electronics projects just as easy as piling bricks! By using Octopus electronic bricks, you may connect Arduino or compatible boards easily with various digital, analog and I2C/Uart interfaces. These breadboard-less firm connections includes an extensive collection of modules like potentiometers, sensors, relays, servos, and even buttons. Just plug and play!
The Octopus Crash Sensor Brick is a simple impact detector based on a leaf microswitch. The output goes low when touched, and high when released. It's useful in small robots for detecting collisions, or for creating other interactive works!