Reply To: Arduino datalogger

What voltage were you putting on that white wire with the external supply?

If you use the “address_change” example, the sensor red wire needs to go on D9 if you want to run the code as-is. If you hook the sensor up as I described and run the address_change example and still don’t get anything, post a new photo of that setup. If you have a different Arduino or sensor, you might also try using one of those in case you damaged either the sensor or the Arduino with too high of an external voltage on the sensor excitation wire.