Raw materials for the next hack morning. We are working on web-enabling the door latch at Think Tank so that we can open the door remotely from a web page. We'll be using a Node.js REST API connected to the GPIO pins on a WiFi-enabled Raspberry Pi. The GPIO pins operate a relay which operates a door latch with a builtin electromagnetic release.
[caption id="attachment_310" align="alignnone" width="300"] Raspberry Pi with relay and electromagnetic door latch.[/caption]