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MRKFOX1200 and Bar02 sensor

Hi All.

I have a problem with my Bar02 sensor. It work perfectly with pro mini and normal arduino. But when i hook it up to MrkFox1200 the sensor is not detected.

Even I2C scanner does not detect the chip.

Any advice?

Can you give us a picture of how everything is connected?

Straight up connection…

Bar02 - Mksfox1200
+3.3V - VCC
GND - GND
SDA - SDA
SCL - SCL

Running your lib… Works like a charm on 3.3v 328p chip without any problems…
Tested with and without external pullups at 4k7 Ohm.
Does not have the hardware in front of me…