I’m connecting a UNIHIKER K10 to a SparkFun GNSS Receiver Breakout MAX-M10S. The UNIHIKER uses a Grove-style I2C connector (GND, VCC, SDA, SCL). What cable or adapter would you recommend to connect the K10 I2C port directly to the MAX-M10S Qwiic connector?
Hi James (@James_Cotter ),
Looking at the UNIHIKER docs, I couldn’t find the pinout of the I2C connector defined anywhere. Specifically what the voltage of the + pin is. But, from the schematic, it is 3.3V and has 10K pull-ups:
So, voltage-wise you should be OK to connect the MAX-M10S Breakout directly to the K10 using the cable linked below.
BUT… u-blox GNSS modules have built-in active I2C pull-ups. Extra pull-ups can sometimes cause bus errors. That’s why the I2C jumpers on the SparkFun Breakout are open by default:
So, the 10K resistors on the K10 may cause problems. Or they may not…
I hope this helps,
Paul