I am trying to hook on an Arduino mini pro (3.3 V) to the SIM908 break out board (see Small Breakout for SIM908 GSM&GPS Module- Compact board with the GSM/GPS SIM908 module- a 20-pin male, but I run into difficulties.
I managed to start the SIM908 modem from within the example SMS Arduino code from this link: Google Code Archive - Long-term storage for Google Code Project Hosting.. I also followed the schematics shown here: http://www.open-electronics.org/gsm-gps-shield-for-arduino/ for my connections from the Arduino mini pro (3.3 V) to the SIM908 break out board. Currently I have connected: D2 and D3 for the SoftwareSerial Tx and Rx connections (PIN 12 & 14 break out), D8 for ON/OFF (PIN 1 break out), D12 to DTR (PIN 10) and D9 to STATUS (PIN 16). I guess with these I should be able to get the modem registered to the network, but it does not. I see in the Arduino IDE's serial monitor the following output: "GSM Shield testing status=IDLE".
The modem has its power through the raw pin from the Arduino, which has its power from a 3.7 Volt 2600 mAh Lipo battery. That must be able to give a 2 A boost to the modem, when it needs it. Level converting does not seem to be necessary, with the Arduino PINS at 3.3 Volt.
Who can help here?
Thanks in advance!