hello,
actually I am using sim908 shield with arduino uno to get the gps data. i am confused, whether the shield interface with the arduino uno with ttl communication or RS232 communication
please comment if someone know
thanks in advance
The above suggests the GPS high will be neat 3V and the low near 0V ... the UNO can receive the GPS signal at 0-3V BUT you should not connect Tx to the board without investigating if the Rx is 5V tolerant.
Of course, you could use an 8MHz 3.3V mini and interface everything at 3.3V
Ray