WebCam

The USB connector is under the RJ-45 network jack at the bottom of the control board. With a USB connector plugged in, there is very little space for a fan or cooling for the stepper drivers. A small fan can be offset to the side of the cables even if it doesn't fit completely.

In Linux, webcams show up as /dev/video# (where # is 0, 1, 2, etc...). If the camera has audio, it should appear as /dev/audio#. Since Dexter doesn't have any built in audio or video devices, /dev/video0 and /dev/audio0 (if it has audio).

To install a simple tool for capturing images or video:
sudo apt-get install fswebcam

Then to test it:
fswebcam test.jpg
and you should see a new image file appear in the folder.

To use the webcam with a NodeJS webserver, install:
https://github.com/chuckfairy/node-webcam by downloading the repo as a zip or tz and extracting it into a temp folder on Dexters SAMBA share at \\<dexters-ip>\share. (Note: This is needed because NPM crashes on Ubuntu 12 trying to install this directly) On the command prompt in Dexter, mv the temp folder contents in the node_modules folder. (Note: This is needed to avoid changing permissions on the node_modules folder to let Windows write to it directly)

In node, you should be able to:

var cam = require("node-webcam")
var pic = cam.capture("test", {skip:2}, function(e,data) { })

pic.shots will show [ Shot { location: 'test.jpg', data: '' } ]. If it's empty, pic.clear() make sure test.jpg is deleted and capture again. The skip:2 option is there to keep it from throwing an "nodejs JPEG library reports unrecoverable error: Not a JPEG file" error. Not sure why that works.

There is a sample of using the web cam with a ws socket on a nodejs service at:
https://github.com/chuckfairy/node-webcam/tree/master/examples/websocket