Automatyzacja pomiaru długości sieci rybackich

Niniejszy artykuł przedstawia zrealizowany projekt badawczy, w ramach którego zaprojektowano i wdrożono system do pomiaru długości sieci rybackich. W artykule przedstawiono założenia projektowe, różne możliwe rozwiązania oraz zrealizowane urządzenie. Wykazano również przydatność mikrokomputerów jednoukładowych w tego typu rozwiązaniach.

This paper describes the author’s project of automatic measurement of the fishing net length. At the beginning, different possible constructions were considered. Typical, mechanical constructions did not provide visible results of measuring (Figs.1 and 2) and were difficult to be automated. To design a measuring system, some assumptions were taken. The results must be well visible in different lighting conditions, the maximum error must be no more than 10cm and the maximum length of the rope equals 100 m. In Fig.3 the whole device is shown. It contains a DC motor and a 100 m rope. It is usually mounted to the back side of a ship. In order to enable counting up and down the rope length, two reflective optical sensors of type CNY70 (Fig.5) were applied. They were mounted in two holes made in plastic cased together with an electronic circuit. All appliances were closed in a plastic water proof casing. The measuring system was designed using the microprocessor type AT89C2051. This is the MCS-51 product with 2K Bytes of reprogrammable Flash Memory, 5 V power supply, two 16 bit counters and 15 programmable I/O lines. The maximum error is less than 50mm, which is less than the value assumed.