Sensors draw current from uC, which can now switch them

git-svn-id: https://heledd.googlecode.com/svn/trunk@74 76c5b99b-c41f-f9d4-998d-396bb8324e16
Adds gerbers and png for r74

git-svn-id: https://heledd.googlecode.com/svn/trunk@75 76c5b99b-c41f-f9d4-998d-396bb8324e16
Revert "Adds gerbers and png for r74"

This reverts commit 60ba7245ddd8ab49e9a17f8c2ca0d72aa5c4b8f6.

I added a bunch of tempfiles on accident.
Merge branch 'master' of https://github.com/nocko/heledd
Adds gerbers and png for r74