Browse Prior Art Database

Digital Anemometer

IP.com Disclosure Number: IPCOM000083134D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Hauptman, GA: AUTHOR

Abstract

Wind speed is recorded by counting the number of vane revolutions during a timed interval. The current count is stored in one register and displayed alternately with a highest gust count stored in another register. The second register is changed only when the first register's contents exceed those previously stored in the second register.

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Digital Anemometer

Wind speed is recorded by counting the number of vane revolutions during a timed interval. The current count is stored in one register and displayed alternately with a highest gust count stored in another register. The second register is changed only when the first register's contents exceed those previously stored in the second register.

Fig. 1 shows the logic for generating timing signals. Fig. 2 is one stage of the counter logic. Fig. 3 shows how additional stages connect to the logic.

In Fig. 1, wind rotates the magnet past four paralleled reed switches to supply a series of pulses to the flip-flop C input. The first pulse starts the 0.1 second timer which, in turn, starts a 1 second timed interval after 0.1 second. This 1 second interval is adjustable to give different totals of pulses per interval (which should correspond to miles per hour).

The flip-flop output Q changes to the 1 state upon the occurrence of the first C input pulse, following the start of the 1 second interval. It falls back to 0 at the first C input pulse following the end of the 1 second interval. In this way, the flip- flop synchronizes the 1 second timer with the C input pulse to prevent random display jitter.

The rise of the flip-flop output Q clears the decade counter (Fig. 2), and the fall of the output (rise of Q) enters the current count in register A. The current count is determined by the number of count pulses received by the decade counter, between the clear...