Imagine you are model aircraft pilot and for a perfect start you need to know the actual weather conditions, especially the speed and direction of the wind. With this information, you can reduce the risk to crash at the start and you can decide for the ideal orientation into the wind for a take off. There are anemometers which give an indication about the windspeed and by turning it manually, the direction can roughly estimated. But this gives just a snippet of the actual conditions. A more robust and reliable system would be preferable.
Other devices on the market like vane style anemometer or ultrasonic anemometers can be used to determine the speed and direction more precisely. But those systems have some disadvantages. They are quite expensive compared to the handheld anemometer and they are bulkier. An alternative, which is comparable in size and prize to handheld wind meters is needed.
As already known from Pitot tube applications, a differential pressure sensor like the SDP3x can be used to measure wind speed. Compared to other measurement principles like membranes this has the advantage that the sensitivity is higher at lower speed and thus is very accurate at small wind speeds (more info).
Get inspired by visiting developer.sensirion.com/windmeter.