I'm trying to stack the Adafruit Data Logger Shield https://learn.adafruit.com/adafruit-data-logger-shield/overview onto a CuteDigi Sim900 GPRS Shield so that I can upload data (collected eventually by a GPS breakout) to a server at certain intervals.
The problem is that I can't seem to get the two shields to play nicely together. I'm a beginner with the Arduino and electronics in general, so hopefully this is just a noob issue.
When I power on the GPRS Shield, the data logger stops outputting the Date/Time to the serial monitor. And when I turn the GPRS Shield off, the serial monitor continues again and shows the Date/Time from the data logger.
They don't share any pins that I'm aware of, and I've tried connecting a 7.4V li-po for external power with no success.
Any help is greatly appreciated!