The system will provide automatic monitoring of weather conditions. It must make these primary measurements:

• Wind speed and direction.
• Temperature.
• Barometric pressure.
• Relative humidity.

The system must measure the wind direction every 0.1 second, the wind speed every 0.5 second, and the temperature, barometric pressure, and relative humidity every minute.

The system will also calculate these derived measurements:

• Temperature trend.
• Barometric pressure trend.

The system must be able to report the highest and lowest values of wind speed, temperature, barometric pressure, and relative humidity for the current day, so it must be able to determine the time and date.

The system must allow the user to set current values for the five primary measurements, and for the current time and date.

The primary measurements are made by off-the-shelf sensors that can be attached to a serial bus so that their values can be set and polled by a PC.

The system will display measurements and the time and date on demand.

• The user monitors the current measurements.
• The user monitors high/low measurements.
• The user sets the time and date.
• The user sets a primary measurement.
• The user turns on the system.