Hi,
I would have expected the output to be a more continuous (analogue) scale than 1 m/s steps; that's ~2 mph or 3 km/hr which seems a rather poor resolution and makes the "start-up" specification of 0.2 - 0.4 m/s rather meaningless.
The arduino ADC has 1024 levels so it could easily recognise ~34 levels if required (I believe the maximum is actually specified as 32.4 m/s). But if there are only ~34 steps, it will be quite important to know if the output value is "rounded" or "truncated", e.g. does the first step (~150 mV) represent a windspeed range of 0.5 to 1.5 m/s or 1.0 to 1.99 m/s ?
If the output is nearer to a a true analogue ramp, then calibration of the ADC may become more of an issue, but the 5 volt regulator / reference should be accurate to within a few percent and could be calibrated against a multimeter if necessary.
At least the cable connections seem to be clearly defined and these anemometers are also available in USA. But sadly i haven't seen a European seller, or even one offering shipping to Europe.
Cheers, Alan.
I would have expected the output to be a more continuous (analogue) scale than 1 m/s steps; that's ~2 mph or 3 km/hr which seems a rather poor resolution and makes the "start-up" specification of 0.2 - 0.4 m/s rather meaningless.
The arduino ADC has 1024 levels so it could easily recognise ~34 levels if required (I believe the maximum is actually specified as 32.4 m/s). But if there are only ~34 steps, it will be quite important to know if the output value is "rounded" or "truncated", e.g. does the first step (~150 mV) represent a windspeed range of 0.5 to 1.5 m/s or 1.0 to 1.99 m/s ?
If the output is nearer to a a true analogue ramp, then calibration of the ADC may become more of an issue, but the 5 volt regulator / reference should be accurate to within a few percent and could be calibrated against a multimeter if necessary.
At least the cable connections seem to be clearly defined and these anemometers are also available in USA. But sadly i haven't seen a European seller, or even one offering shipping to Europe.
Cheers, Alan.