This problem concerns wind measurements made by the wireless weather station. Similar to the Temperature Measurement and Display problem as illustrated in

The wind-speed measurement uses a rotating anemometer connected by a shaft to an enclosed meter. Anemometers measure wind speed by the amount of wind pressure against a surface, such as a cup or a propeller. A mechanical anemometer contains a wheel with cups or a propeller at the end of the spokes of the wheel. One of them contains a magnet. Each time the magnet passes a switch, it produces a 3 V signal and makes a recording. The sooner it passes the switch the faster the wind speed.

Also, its direction can be determined and measured with a wind vane. Data from wind vanes can be used to calculate average wind direction and fluctuations, during specific time periods. Wind direction refers to the direction from which the wind blows. It is recorded using the compass cardinal points (N, NE, E, SE, S, SW, W, NW).

A wind vane is mounted on a shaft or spire. As the wind blows, the tail catches the wind, which moves the nose (tip of the arrow) and points in the direction the wind is coming from. To make a proper reading of wind direction, its important to use a compass. The vane's nose direction turns a dial in the enclosed meter below whose magnet produces a 3 V signal associated with compass cardinal points, and its readings are recorded over time.

(a) Sketch the time relative appearance of voltage waveforms produced by this wind speed sensor (1) when the wind is calm = 10 mph and = 25 mph and = 40 mph.

(b) Sketch the time relative appearance of voltage waveforms produced by this wind vane sensor for direction.

(c) Explain what information the microcomputer must have available and the tasks it must perform to convert the voltage waveforms produced by the anemometer into a binary number representing wind speed in miles per hour,

(d) Explain what information the microcomputer must have available and the tasks it must perform to convert the voltage waveforms produced by the wind vane into a binary number representing wind direction associated with the compass cardinal points.

iemperature iveasurement and Lispiay Example 1-1