Motion sensor 4 as men Header Connector can provide motion information based on the 2-position. With some effort you can make your own motion sensor on

Head Sensor Connector hook type you will use to be in the middle of four remaining sections were passed with pliers or cutters others inward turn away a large part of the work was done

Before completing the process of turning the inner side of the pins are lightly stoning case is better understood in the picture below

Grinding reason for doing that is of great importance in the operation of the sensor to the pins of the ball to ensure full contact

After the pins to be placed between the plastic tube is placed in the appropriate size cut and put a ball into

Part tilted plastic pipe inside the ball short circuit pins to the pins that are connected to the system if you happen to run a very interesting idea, nice work became a little more exaggerated or pipe the middle of the top and bottom split off the pin placed 4-position motion sensor can be made. Sensor Robot can use for your projects :)

source http://www.instructables.com/id/SQ7OP1FFLROKSLF/