I've previously built various GHI Gadgeteer and Pi3 based projects and also built my own mini ElectricImp PCB.
But for a one-off project I have the following requirements (it's for monitoring the charging of 2 lead acid batteries in a camper van from a solar array)
Programmable in a sensible high level language - C#, Python
Cheap-ish - less than £75 for all parts
Two analogue inputs (range can be anything as I'll pre-condition)
Two digital outputs (again I can add my own relay drivers)
GPS location aware
WiFi interface (I'm going to use a mobile phone WiFi access point when it's out and about)
Able to either call into a restful web service using JSON or similar
Low-ish power, preferably has low-power mode like 50mA and then 1A or so when running
Every few minutes check GPS position and battery voltage, log to web service
When battery voltage goes above 13.5V, set digital out to 1
When battery falls below 13V, set digital out to 0
As there is a HUGE array of GPS units and stuff, and I am kinda fed up with GHI as expensive, can anyone recommend a platform and expansion boards that will satisfy the requirements?
Again, I'm happy to wire up my own level converters, relay drivers, etc.
Thanks loads in advance! :)