I have this eternal struggle going. It seems to be an endless game. The mission is pretty simple, but it hasnt been possible to pull it off yet.
Mission: Make a Gadgeteer device stand on a field powered by a 12V car battery, and report back to a server over HTTP on a daily basis.
I have given up on the NETMF networking stack over cellular (using PPP), so I have turned to basic usage of the SIM900 firmware, which support HTTP communication. I have made it work a few times, but its about as unstable as the PPP solution.
After browsing lots of pages with other user of the SIM900 module it hits that the Seeed schematics might not be completely following the requirements. I have seem Seeed modules before that was working, but not in any way well designed (sorry Seeed).
So, I took a look at:
But its hard for me to read, as a non-hardware guy. People are recommending a 1000uf over power, and I see a big one on the module, but cannot see it on the drawing.
In case I wanted to put 1000uF on power, where should I put it, just for testing? I am afraid just placing it between GND-5V would impact the rest of the modules/mainboard.