CSSA common room door sensor - ESP32 version

Following on from the roaring success of our Mk. 1 (Arduino Pro Mini -> USB serial) and Mk. 2 (parallel port as pseudo-GPIO) door sensors, the ANU Computer Science Students' Association and Widget Co. is proud to present the Notification System, Room Occupancy, Electromagnetic, Mk. 3.

Powered by an ESP32-S2 eval board, this system integrates door sensing and API updating in the one system, like the Mk. 2 computer-based script, thanks to the ESP32's onboard Wi-Fi, without relying on the notoriously fragile Spotify machine, as both previous systems had to.

To build this, you'll first need to install ESP-IDF, then:

$ idf.py set-target esp32s2
$ idf.py menuconfig
$ idf.py build
$ idf.py -p <port> flash
$ idf.py -p <port> monitor

You'll need to set some valid ANU credentials in idf.py menuconfig. Make sure you don't accidentally push the file sdkconfig to Git - it'll have those credentials in it! If you forget, poke Felix to scrub it from the Git history.

Once you've built and flashed once, substitute app and app-flash for build and flash, to speed things up a little.