Requirement: Interface over RS485 to modbus water depth measuring device
Method: prove out the Electric Imps capability to talk over modbus
I defined and wrote (with some EI forum input) the ability to poll a modbus device and publish it to ThingStream.net Uses Electric Imps Squirrel lang.
https://github.com/neilh10/ei_modbus
Used Sparkfun IMP001 hw + Sparkfun RS485 modules

Requirements: Measure water usage or rain water in real time
Method: Count pulses coming off a water meter, or could be rain gauge to be able to make real time measurements
I Defined, wrote and published. Running my own version https://github.com/neilh10/totalizer01
Designed the hardware shield for interfacing to Arduino for low power pulse counting. Publishes to the web (currently Xivm but needs to change to ThingStream)

Defined and published. https://github.com/neilh10/at91sam3xaz01