View Full Version : ProPPhone

01-15-2009, 01:23 AM
Many thanks to Jay and Phil for blazing the path here...

I'm going to try to turn this into a fully functioning... public domain... cell phone... a long and complicated process, from which I expect
to get much enjoyment and learn a bunch.

For the moment... with the code provided you can hook your Prop up to a gm862 from Sparkfun and use your Prop to communicate using AT commands...

For those of you interested in sending SMS messages... look at Jay's program over in the Sand Box. I'll put a program in this thread modified
to work on the ProPPhone.

You need to put a simcard from a working phone into the 862... remove two jumpers... attach 3 wires and you are good to go.

The terminal demo shows how to get the network status and gps position before it falls into the terminal section.

ProPPhoneTerminal will make calls and receive calls as is... but of course you need a microphone and speaker hooked up to either the Prop or the

If I hadn't destroyed my Demo Board, I would be done with phase 1 already:)


OOPS... forgot to put in the standard license verbage... it is all free for use as described by the MIT license

Post Edited (rjo_) : 1/14/2009 6:31:32 PM GMT

01-15-2009, 01:42 AM
question 1...

As you know, cell phones are really noisy. I am amazed at how nice the TV looks most of the time and that more garbage isn't
getting into my receive line. Transmit is rock solid, but if I wait lone enough... spurious characters begin to show up on my
screen... not a problem until I start using the feedback from the 862, which I will do very shortly.

I assume that a little capacitor will clear this up? If so... other than trial and error, how do I choose the right one?


01-15-2009, 10:54 AM

I just read about the gm862. It is quite a module. I was thinking, since AT&T to AT&T call is free, I can add two of these for another $30/month and connect whenever I want from wherever I wat.
Do you have a schematic for how you connected to it?

Take Care,