Hi,
I’m run calibration code and the O2 value is Ok. But why, when I’m put on balloon with exhale air at the sensor, value don’t changed?
When sample code runs, values changing, even when blowing on sensor, but it’s very low.
I saw the page http://wiki.seeedstudio.com/Grove-Gas_Sensor-O2/ was edited with warning of reference value of voltage.
According to this if I’ll rewrite line “float Concentration = MeasuredVout * 0.21 / 2.0” to “float Concentration = MeasuredVout * 0.21 / 0.85” where 0.85 - my Vout value at fresh air. Does it OK that my sensor showing Vout at two times lower than in sample?