Connecting a GNSS RTK Breakout - LG290P to a SparkFun BlueSMiRF v2 and a 3.7V LiPo Battery?

GPS/GNSS
1

Hi everyone.

@sparky and @PaulZC

I’d like some guidance on connecting the SparkFun Quadband GNSS RTK Breakout - LG290P (Qwiic) to a SparkFun BlueSMiRF v2 and a 2.7V LiPo battery. I would appreciate it if you could share a connection diagram.
Is this possible?

Regards, Angel

2

Hi Angel (@amlago ),

There is no safe way to connect a 3.7V LiPo battery to the LG290P Breakout. You could connect it to the GND and 5V breakout pads and it would power the Breakout correctly. BUT the 5V breakout pad is connected to USB-C 5V. Bad things will happen if you have the battery and USB-C connected at the same time.

If you always disconnect the battery before connecting USB-C, then you should be OK. But, if you forget, bad things will happen.

It would be safer to power the Breakout from a USB-C 5V LiPo “power bank”. One that has a always-on “trickle-charging” mode, to prevent it turning off if it thinks nothing is connected.

For the BlueSMiRF connections, please refer to the hookup guide.

Please remember that the LG290P defaults to 100ms fix interval and 460800 baud. You will need to change both when connecting the BlueSMiRF.

Best wishes,
Paul