Made a prototype breadboard today. It is essentially two of the sample projects from the Sparkfun Tutorials on Electric Imp mashed together (Example 2 & 3).

https://learn.sparkfun.com/tutorials/electric-imp-breakout-hookup-guide/all

Here is the breadboard:

Here is the schematic

When S1 is closed then LED1 will be set to 'Green' and a status update will be sent to the server to be posted on a web page saying the tennis courts are open. If it starts raining then the staff will flip the S1 switch to open, the LED1 will be set to 'Red' and a status update will be sent to the server.

I have ordered parts for the engineering prototype, which primarily are two tennis ball lights, one of which I hope I can make work for this project. The rest of the parts I have here hiding in old projects.

Next I will get the software working, which shouldn't be bad since like the hardware will be based on existing working examples (I know, famous last words).