Hi All
My first real project after having my Netduino for 2 weeks is pretty much complete, at least based on the original specs I had in mind. It's an SMS controlled mains power switch, switching up to 4 sockets independently.
You can send it SMS commands to turn on, turn off, or return the current state of each of the relays/sockets.
It consists of
- a Netduino Plus 2
- A Seeedstudio GPRS Shield V2
- A Seeedstudio Relay Shield V2
- A Seeedstudio Grove Serial LCD (which annoyingly, since I bought it 3 weeks ago, has been discontinued)
I hope to eventually fit this all into a 4 socket power board, although I'm not sure at the moment exactly how I'm going to do that.
The GPRS shield is on COM1 and the LCD on COM2 with the relays connected from D4 - D7.
The code is heavily based on Jair's code here but translated to English (thanks Google!) and some bugs caught. The biggest being I had to add a delay to the eventhandler for incoming messages or I wouldn't always get actual message text, only the header. I'm not sure if this is expected of the event handler (to fire before the buffer has finished writing) but once I caught that everything else was pretty straight forward. I did add some code to pull the date/time from the cell network.
The LCD code is basically a direct port of the Seeedstudio Arduino driver and would obviously need to be replaced anyway since the LCD is now discontinued.
One thing I'd still like to add is a timer or event to automatically turn the back-light of the LCD off after 5 seconds of inactivity to save power, however the initial attempt didn't go great so that's still on the to-do list. Since I'm brand new to C# it'll probably take some time.
If you're looking for a driver for a SIM900 based shield, the version I've used it probably the best one available at the moment. All the previous ones I looked at either didn't do SMS at all, or only did sending. Jair's driver was a godsend in that regard.
Full code is here
Questions and comments welcome. This was my first experience with .NETMF, C# and Netduino so it's likley I've done a lot of things wrong, but it works 
Edited: Changed Repo and made code modular so LCD code can be disabled
