I have my Stalker V2.1 and GPRS shield working nicely and sending data/SMS. Now if I want to include the use of the RTC or other I2C device I have problems.
The simplest way to describe the problem is this: I load the just the Stalker with the DS3231 example code (NOW) and the time is nicely displayed on the Serial window as expected. If I now plug the GPRS sheild onto the Stalker I get nothing - same code.
Has anyone else had this problem or know of a fix please?