I'm just getting started using Arduino to build a prototype for my project. Please bear with me and would appreciate any help. I am using the MAX30105 breakout which has the following pins: INT, GND, 5V, SDA, SCL. I connected each pin to the Arduino (except INT which is not being used since there is only one board on the I2C bus).
It worked fine for a few days, then the sensor stopped working. I suspect it burned out for some reason? I am powering the Arduino with a 9V battery. Is there a difference between the different GND pins on the Arduino? I connected it to a different GND pin than the one outlined in the guide I used (https://learn.sparkfun.com/tutorials/max30105-particle-and-pulse-ox-sensor-hookup-guide/all), but as I understand it, it should not matter which GND pin is used.
I bought a new MAX30105 but before connecting it I want to make sure that I'm connecting this properly so that it doesn't fail again after a few days. Thank you!