{"id":4465,"date":"2020-01-17T09:00:36","date_gmt":"2020-01-17T08:00:36","guid":{"rendered":"http:\/\/www.moreware.org\/wp\/?p=4465"},"modified":"2020-01-17T12:41:01","modified_gmt":"2020-01-17T11:41:01","slug":"arduino-che-cose-un-potenziometro-e-come-usarlo","status":"publish","type":"post","link":"https:\/\/www.moreware.org\/wp\/blog\/2020\/01\/17\/arduino-che-cose-un-potenziometro-e-come-usarlo\/","title":{"rendered":"Arduino: che cos&#8217;\u00e8 un potenziometro e come usarlo"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>Un potenziometro \u00e8 una <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=2e2381216edd6cf2a429518b9cf52380&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=resistenza, resistenze, resistore resistori\">resistenza<\/a> variabile. Vi \u00e8 una staffa che ruota che ci permette di gestire la portata della <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=2e2381216edd6cf2a429518b9cf52380&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=resistenza, resistenze, resistore resistori\">resistenza<\/a>.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Il potenziometro \u00e8 ampiamente usato in elettronica come partitore di tensione regolabile. Vi sono due resistori collegati in serie.<\/strong><\/p>\n<p style=\"text-align: justify;\">Il potenziometro \u00e8 un dispositivo elettrico equivalente ad un partitore di tensione resistivo variabile (cio\u00e8 a due resistori collegati in serie, aventi la somma dei due valori di <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=2e2381216edd6cf2a429518b9cf52380&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=resistenza, resistenze, resistore resistori\">resistenza<\/a> costante, ma di cui pu\u00f2 variare il valore relativo), infatti una sua parte viene disposta in parallelo al carico utilizzatore.<\/p>\n<p style=\"text-align: justify;\">il potenziometro \u00e8 costituito da un cilindro isolante su cui \u00e8 fittamente avvolto un filo metallico con resistivit\u00e0 opportuna collegata a due terminali di contatto su cui si sposta un contatto mobile, azionato da un comando esterno, che pu\u00f2 percorrerla da un estremo all\u2019altro. Questo contatto \u00e8 collegato a un terzo terminale<\/p>\n<p style=\"text-align: justify;\">Un utilizzo classico \u00e8 nella regolazione di volume negli amplificatori audio.<\/p>\n<p style=\"text-align: justify;\">In questo articolo sar\u00e0 esposto come regolare l&#8217;intervallo di tempo con cui un buzzer passivo(ossia un buzzer che genera suoni a una diversa frequenza) tramite l&#8217;ausilio di un potenziometro.<\/p>\n<p style=\"text-align: justify;\"><strong>I materiali da utilizzare sono i seguenti:<\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li>1x board di <a href=\"https:\/\/amzn.to\/30EQNCp\">Arduino<\/a> o <a href=\"https:\/\/amzn.to\/360HddV\">compatibile<\/a><\/li>\n<li>1x <a href=\"https:\/\/amzn.to\/2R5DGXL\">buzzer passivo<\/a><\/li>\n<li>1x <a href=\"https:\/\/amzn.to\/2FVZuhW\">potenziometro da 10k<\/a><\/li>\n<li>1x <a href=\"https:\/\/amzn.to\/38f5u1l\">breadboard<\/a><\/li>\n<li><a href=\"https:\/\/amzn.to\/2sy2uhn\">Vari jumper<\/a><\/li>\n<\/ul>\n<p>In alternativa \u00e8 possibile far riferimento allo <a href=\"https:\/\/amzn.to\/2NuUUeP\">starter kit Elegoo<\/a>.<\/p>\n<p style=\"text-align: justify;\"><strong>Nella immagine sottostante vi \u00e8 il diagramma di collegamento:<\/strong><\/p>\n<p style=\"text-align: justify;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4554 size-large\" src=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?resize=793%2C657&#038;ssl=1\" alt=\"potenziometro \" width=\"793\" height=\"657\" srcset=\"https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?resize=1024%2C849&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?resize=300%2C249&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?resize=768%2C637&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?resize=1536%2C1273&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?w=1755&amp;ssl=1 1755w, https:\/\/i0.wp.com\/www.moreware.org\/wp\/wp-content\/uploads\/2020\/01\/ADAS.jpg?w=1586&amp;ssl=1 1586w\" sizes=\"auto, (max-width: 793px) 100vw, 793px\" \/><\/p>\n<p style=\"text-align: justify;\">Il codice da caricare sulla board di <a href=\"https:\/\/www.moreware.org\/wp\/blog\/tag\/Arduino\">Arduino<\/a>\u00a0\u00e8 il seguente<\/p>\n<pre class=\"lang:default decode:true\">int potentiometerPin = 0; \/\/si tratta del pin A0, attraverso il quale si potr\u00e0 effettuare la misura della tensione\r\nint buzzer=2; \/\/pin digitale in cui \u00e8 collegato il buzzer passivo\r\nint value = 0; \/\/inizializzazione variabile attraverso la quale si potr\u00e0 conoscere il valore della tensione\r\nvoid setup()\r\n{\r\n  Serial.begin(9600); \/\/ inizializzazione porta seriale\r\n}\r\nvoid loop()\r\n{\r\n  value = analogRead(potentiometerPin); \/\/ leggo valore potenziometro\r\n  Serial.println(value); \/\/ sul monitor compare il valore del potenziometro\r\n  tone(buzzer,440,value); \/\/il buzzer genera un suono alla frequenza di 440 Hz la cui durata dipender\u00e0 dal valore del potenziometro\r\n  delay(value); \/\/intervallo di tempo tra due suoni\r\n}<\/pre>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>Un potenziometro \u00e8 una <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=2e2381216edd6cf2a429518b9cf52380&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=resistenza, resistenze, resistore resistori\">resistenza<\/a> variabile. Vi \u00e8 una staffa che ruota che ci permette di gestire la portata della <a title=\"\" class=\"aalmanual\" target=\"_blank\"   href=\"https:\/\/www.amazon.it\/gp\/search?ie=UTF8&#38;tag=morewareblog-21&#38;linkCode=ur2&#38;linkId=2e2381216edd6cf2a429518b9cf52380&#38;camp=3414&#38;creative=21718&#38;index=aps&#38;keywords=resistenza, resistenze, resistore resistori\">resistenza<\/a>. Il potenziometro \u00e8 ampiamente usato in elettronica come partitore di tensione regolabile. Vi sono due resistori collegati in serie. Il potenziometro \u00e8 un dispositivo elettrico equivalente ad un partitore<\/p>\n","protected":false},"author":5,"featured_media":4556,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,92],"tags":[65,512,231],"class_list":["post-4465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-tutorial","tag-arduino","tag-potenziometro","tag-tutorial","has-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Arduino: che cos&#039;\u00e8 un potenziometro e come usarlo - Moreware Blog<\/title>\n<meta name=\"description\" content=\"Un potenziometro \u00e8 una resistenza variabile. 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