How can I connect my own magnetic contact/reed switch? Ideally I would like to use the pins (not the connectors) but I can not find any documentation on the pins labelled RPI_CONN. Where can I get these docs and what is the best way to connect a magnetic reed switch (I want to detect a door open or closed status).
Thanks
Geoff
Hi Geoff
I’m not sure if this is relevant for what you want, but maybe this?
https://github.com/DexterInd/GrovePi/blob/master/Hardware/GrovePi%2B%20v3.0.pdf
I hope this helps, otherwise I’ll get someone more knowledgeable to help out.
Cleo
You might find the information here useful too: http://www.dexterindustries.com/GrovePi/engineering/port-description/. It might be easier to use the 4 pin grove ports since they all are 5V and connected to the Pi via the GrovePi and accessible from the python functions. The Grove ports have 4 pins and have the pinout like GND, +5V, Sig1 and Sig2.
-Karan
also, RPI_CONN is the standard 26 pin header connected to the Pi. You can find out more about the pins on there here: http://www.raspberrypi-spy.co.uk/wp-content/uploads/2014/07/Raspberry-Pi-GPIO-Layout-Model-B-Plus-rotated.png
I should have known it would be that obvious 
thanks.
Good information to know - thanks.
Very useful - I didn’t know that document existed - than you!