Hello,
I use modified code with DHT22 and no light meter on Weamo D1 and nodemcu v3.
One sensor prints a value of strange 0.5 and the other one is 0.15 at the same location.
What can I do to calibrate and show the right values and PPM?
Thank you
I use modified code with DHT22 and no light meter on Weamo D1 and nodemcu v3.
If you use modified code, why don't you post it here? Don't forget the code tags!
One sensor prints a value of strange 0.5 and the other one is 0.15 at the same location.
One sensor measures the temperature, the other one a gas concentration. Why do you expect them to return the same value?
What can I do to calibrate and show the right values and PPM?
Usually the best way to calibrate a temperature sensor is to use a comparison temperature sensor (a calibrated one) and measure at the same location. The gas sensor doesn't measure the concentration of one gas but of many different. So you won't ever get a PPM value out of it. But the principal of calibration is the same as for temperature.