Hello!
I had an old Conceptronic CBTGPS32 GPS-to-Bluetooth mouse lying around and decided to see if I can utilize it for an Arduino project.
After opening it, I found 8 labeled pins without pin headers. I soldered pin headers onto them.
Here are two photos (upper and lower side). The Mini USB connector has no data connection, it's just for charging (the device used a Li-Ion battery).
The 4 pins on the left side are labeled GND, BTX, BRX and BVDD. The 4 pins on the buttom side are labeled GRX, GTX, VBAT and VBUS.
I guessed the BT module might use GND/BVDD for power and BTX/BRX for serial data and the GPS module might use GND/VBAT for power and GTX/GRX for serial data - and I have no idea what VBUS is for.
Whenever power is attached to GND and BVDD or VBAT, and the power switch is turned on, the device behaves as usual: The LEDs indicate "waiting for GPS" and "waiting for BT connection". But I am unable to get a NMEA connection at the GTX/GRX pins (the manual says 4800 to 115200 baud is supported), neither with power switch turned off nor turned on, and I am neither able to get any answer of the BT module at the BTX/BRX pins...
Do you have any ideas?
Best regards,
Cherry