Sensor sanity check #112
Description
Arduino board: Arduino Nano v3
Arduino IDE version (found in Arduino -> About Arduino menu): 2.3.2
Dear Maintainers!
I would like to ask for some improvement of this library to make it more robust in case of wiring issues.
Because of thermal expansion sometimes my wires get loose and I have contact issues. I know, this is my problem, I should have solder it, and so on.
But I would expect to have some sanity check functionality from the library side.
Given the following test scenario:
- Running the code of: bme280test.ino
BME280 test
-- Default Test --
Temperature = 28.53 °C
Pressure = 1003.00 hPa
Approx. Altitude = 85.73 m
Humidity = 50.89 %
Temperature = 28.74 °C
Pressure = 1003.03 hPa
Approx. Altitude = 85.46 m
Humidity = 50.77 %
- When I disconnect the sensor, I do not get NAN values (except Approx. Altitude), instead invalid values:
Temperature = 179.55 °C
Pressure = -160.23 hPa
Approx. Altitude = nan m
Humidity = 100.00 %
Temperature = 179.55 °C
Pressure = -160.23 hPa
Approx. Altitude = nan m
Humidity = 100.00 %
- After reconnecting the sensor, finally there are NAN values:
Temperature = nan °C
Pressure = nan hPa
Approx. Altitude = nan m
Humidity = nan %
Thanks to NAN values, I can call the begin() function again and I can make the sensor work properly.
But I have no workaround for now to avoid the invalid values.
If there would be a possibility to check if the sensor is really connected and responding properly, that would be great!
For example:
- sensorID() function could actually querry the sensor ID and not returning a cached value. I don't want to call begin() all the time before measurement.
- There could be a isConnected() or similar function which checks if the sensor responds to a command with valid data.
Thank you in advance!