I am seeking a document that defines the many sensors on a Mango Yellow.
We see the various readings, but would like to know what the unit of measure is for each sensor and also a reference for an expected range.
For example, we know temp is in Celsius and know what is normal under given circumstances. However, the two temp sensors on the Mango indicate that the temo is 30 degrees in my office. That is about 84 degrees F, and I know that is not accurate.
In reference to the environmental sensors, we do no know what the units are (but would like to) and also a scale of what is normal range and what is out of range. For example, exactly what is CO2e? Carbon Dioxide Equivalent.
These questions are beyond the technical. We are not asking how to configure or turn them on, we are asking what do they mean.
I did some hunting and went through the BOM document from here:
Lines 58, 62 and 67 are the IMU, Magnetometer and Gas sensor. The part numbers are:
BOSCH BMI160 - Inertia Measurement Unit
BOSCH BMI150 - Geomagnetic Sensor
BOSCH BME680 - Gas Sensor
The BME680 is the gas sensor you are looking for. Here is the listing on the Bosch website for that part:
And here is the datasheet:
On page 25 of the datasheet there is “Table 18: BSEC outputs”. This has some good info about the different readings from the sensor. For example, the CO2 equivalents is measured in PPM. It is not a direct measure of CO2, but derived from a correlation between VOCs and CO2 in human’s exhaled breath.