1 post about
GSM shield

Building the Open-Electronics.org GSM/GPRS Shield V2

I got one of these SIM900 based GSM Arduino shields and decided to write a little step-by-step guide of building this shield. For schematics and the official documentation have a look here. Happy building! Lets start by soldering on microphone and speaker jacks: Clip the two separate jacks into place, you might need to...