Avtonomni merilnik števila zavesljajev

BOŽIČ, BOŠTJAN (author), Geršak, Gregor (mentor)

Leta 1992 je veslanje prineslo prvo olimpijsko medaljo za samostojno Slovenijo na Olimpijskih igrah v Barceloni in leta 2000 tudi prvo zlato odličje z Olimpijskih iger v Sydneyu. Veslanje je eden izmed najtrofejnejših športov v Sloveniji, ki zahteva ustrezno vrhunsko opremo z novimi materiali in ustrezne merilne naprave za pridobivanje različnih informacij z namenom povečanja hitrosti čolna in doseganja boljših rezultatov. Za trenerje in veslače je zelo pomemben podatek frekvenca veslanja (v nadaljevanju tempo). S pomočjo tempa lahko določimo intenzivnost treninga na vodi, zato je merilnik frekvence veslanja (v nadaljevanju tempometer) dobrodošel v vsakem veslaškem čolnu. Tempo veslanja se giblje od 16 zaveslajev na minuto pri nizkih intenzivnostih na treningu, pa do več kot 48 zaveslajev na minuto v fazi štarta tekmovanja. Cilj naloge je izdelava nizkocenovnega tempometra, ki deluje s pomočjo merjenja pospeška čolna. Na tržišču obstaja veliko proizvodov za merjenje tempa veslanja, vendar so ti merilniki precej dragi. Osnovna ideja je bila izdelati tempometer, ki ne vsebuje zunanjih dodatnih elementov za določanje trenutka zaveslaja (kot so reed rele) ter kablov za povezavo elementov. Za merjenje pospeška sem izbral komercialni triosni pospeškometer z merilnim območjem +/- 3 g. Tempo veslanja sem prikazoval na LCD prikazovalniku Nokia 5110, vse skupaj pa je bilo krmiljeno s procesorjem Arduino Pro Mini, katerega osnova je ATmega 328. Nastavek merilnika je bil izdelan tako, da se prilagaja nosilcu proizvajalca Nielsen - Kellerman. Cilj naloge je bil tudi načrtati primerno vodotesno ohišje. Izdelan prototip sem ovrednotil z identifikacijo možnih motenj, ki lahko vplivajo na točnost merjenja tempa. Elemente sem vgradil v začasno ohišje, katerega sem kasneje pritrdil v čoln. Iz testiranj sem ugotovil, da tako sprogramirana naprava dela pravilno pri določenih pogojih. Ti pogoji so: dovolj velika sila veslača na veslo, tempo veslanja od 24 zaveslajev na minuto navzgor in mirna vodna gladina.

• Language: Slovenian
• Keywords: veslanje, pospešek, tempo, tempometer
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-84202
• Publication date in RUL: 19.07.2016

Secondary language

• Language: English
• Title: Autonomous stroke meter

Abstract

In 1992 rowing brought the first Olympic medal for the independent Republic of Slovenia at the Barcelona Olympic games and in 2000 the first gold medal at the Sydney Olympic games. One of the top winners of sports in Slovenia requires appropriate equipment with new materials and appropriate measuring devices for obtaining various kind of information in order to increase the speed of boat and achieve better results. The stroke rate is a very important parameter for coaches and rowers. With the help of pace we can determine the intensity of training on the water. Therefore, rowing frequency meter (hereinafter referred as stroke meter) is welcome in every rowing boat. Rowing stroke rate ranges from 16 strokes per minute at low intensity training up to 48 strokes per minute or more at the start stage of a competition. The aim of the project is to produce a low-cost stroke meter by measuring boat acceleration. There are many products for measuring the frequency of paddling on the market, but these are quite expensive. The basic idea is to create a stroke meter, which contains no additional external components through which the moment of paddle strokes is detected (such as reed relays) and cables for connecting elements. To capture the acceleration I have chosen Sparkfun's three axis accelerometer that measures acceleration up to +/- 3g. The frequency of paddling will appear on the LCD display of the Nokia 5110. Everything will be controlled by the processor Arduino Pro Mini, which base is the ATmega 328. The attachment of the stroke meter will be designed so that it will adjust to the manufacturer Nielsen – Kellerman brackets. The aim is also to design appropriate waterproof housing. The prototype was evaluated with the identification of possible interference which can affect the accuracy of stroke measurement. I have installed elements in the temporary housing which were later fixed in the boat. The testing results show that so programmed device shall operate properly under certain conditions. That conditions are sufficient rower’s force on the oar, minimum rowing pace of 24 stroke per minute and flat water.

• Keywords: rowing, acceleration, stroke rate, stroke meter