Not enough space

Sensor wires are small. So small in fact that screw terminals sometimes can't grip them properly and the available pin crimps that I had just wouldn't crimp correctly. I needed some kind of breakout board for them to attach to the Mega screwshield.

In addition to this there wasn't any space left on the Wild Thumper to mount anything without building a 2nd level. A re-design was needed.....

Instead of using an ABS box for a mounting point, I just used spare strip board. This enabled me to build in a separate breakout board for the sensors with screw terminals to wire into the screwshield.

The ultrasonic sensors are wired GND / VCC / SIG which is the centre board with 9 headers for further expansion. The Sharp IR sensor however is wired VCC / GND / ANALOGUE, so a smaller board in the top right of this picture was made. Each board gets a 5V and a GND signal thats common to all header connections. The Signal pins are then all wired upto a screw terminal to allow an easy link across to the screw shield.