Since I have poor GPS reception in my car I thought I could forward GPS data from GPS module to a phone via bluetooth.
I am using NEO-6M GPS module and HC-05 bluetooth module.
At first I was thinking about using Arduino, but then it occured to me that both GPS and bluetooth modules are operating 3.3V UARTs on respective inputs and outputs. Therefore is there any downside in connecting their TX and RX lines directly? By default both modules use 9600 baudrate so I don't think any configuration is needed.
Best Answer
Yes. The HC-05 is meant to be a drop in module for TTL level serial connections. Simply cross connect the TX and RX lines (if you are certain both use 3.3V levels), power and ground, connect to the bluetooth device and you are good to go. As a serial port.
As for actually using it as a NMEA GPS in android, that may not be so easy. See https://gis.stackexchange.com/questions/139047/how-to-extract-nmea-outputs-from-an-external-bluetooth-gps-to-an-android-device and https://stackoverflow.com/questions/25155848/handling-data-from-external-bluetooth-device-with-gps-nmea-strings