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{"id":38,"date":"2011-10-24T17:19:56","date_gmt":"2011-10-24T17:19:56","guid":{"rendered":"http:\/\/lessnullvoid.cc\/pulsum\/?p=38"},"modified":"2012-01-13T15:46:11","modified_gmt":"2012-01-13T15:46:11","slug":"emf-exp_1","status":"publish","type":"post","link":"https:\/\/lessnullvoid.cc\/pulsum\/emf-exp_1\/","title":{"rendered":"EMF exp_1"},"content":{"rendered":"

<\/iframe><\/p>\nEl primer experimento se basa en el uso de un sensor EMF (Electro Magnetic fields). El sensor detecta variaciones en la resistencia de la planta provocados por interferencia. Al acercarnos a la planta modificamos con nuestra resistencia la tensi\u00f3n de la planta provocando un cambio en la lectura.<\/p>\nLos sensores dise\u00f1ados a partir de un amplificador operacional tienen dos polos uno se conecta de forma directa a la planta y el otro a la tierra. La lecturas obtenidas son procesadas por un c\u00f3digo de PWM en arduino, generando una se\u00f1al audible como respuesta a las variaciones.<\/p>\n<hr \/>\n<div class=\"code arduino\">\n<div class=\"cBody\">\n<pre>#define DIV_PIN 5\r\n#define FREQ_PIN 4\r\n#define DUTY_PIN 3\r\n\r\nvoid<\/span> setup<\/span>(){\r\n pinMode<\/span>(3, OUTPUT<\/span>);\r\n pinMode<\/span>(11, OUTPUT<\/span>);\r\n TCCR2A = _BV(COM2A0) | _BV(COM2B1) | _BV(WGM20);\r\n}\r\n\r\n\/\/ accepts values 1-7 to set prescalers 1\/8\/32\/64\/128\/256\/1024 <\/span>\/\/ 0 turns timer off <\/span>void<\/span> setPrescaler(uint8_t divisor){\r\n if<\/span>(divisor > 7)\r\n return<\/span>;\r\n TCCR2B = _BV(WGM22) | divisor;\r\n}\r\n\r\n\/\/ expects a value 0.0-1.0 <\/span>void<\/span> setDutyCycle(float<\/span> value){\r\n OCR2B = OCR2A * value;\r\n}\r\n\r\nvoid<\/span> setTopLimit(uint8_t limit){\r\n OCR2A = limit;\r\n}\r\n\r\nvoid<\/span> loop<\/span>(){\r\n setPrescaler(analogRead<\/span>(DIV_PIN)>>7);\r\n setTopLimit(analogRead<\/span>(FREQ_PIN)>>2);\r\n setDutyCycle((float<\/span>)analogRead<\/span>(DUTY_PIN)\/1023.0);\r\n}<\/pre>\n<\/div>\n<\/div>\n<hr \/>\n <\/p>\n<img loading=\"lazy\" class=\"alignleft\" src=\"http:\/\/farm7.static.flickr.com\/6211\/6295822676_316db1dc92_z.jpg\" alt=\"\" width=\"295\" height=\"220\" \/><\/p>\n<img loading=\"lazy\" class=\"alignnone\" src=\"http:\/\/farm7.static.flickr.com\/6044\/6295292647_7506e3f7ac_z.jpg\" alt=\"\" width=\"294\" height=\"220\" \/><\/p>\n<figure id=\"attachment_122\" aria-describedby=\"caption-attachment-122\" style=\"width: 588px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorEMF.jpg\"><img loading=\"lazy\" class=\"wp-image-122 \" title=\"sensorEMF\" src=\"https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorEMF-1024x651.jpg\" alt=\"\" width=\"588\" height=\"372\" \/><\/a><figcaption id=\"caption-attachment-122\" class=\"wp-caption-text\">circuito por Guto Nobrega: http:\/\/archive.gutonobrega.co.uk\/<\/figcaption><\/figure>\n <\/p>\n<a href=\"https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorgalvanico.png\"><img loading=\"lazy\" class=\"alignleft wp-image-124\" title=\"sensorgalvanico\" src=\"https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorgalvanico.png\" alt=\"\" width=\"640\" height=\"434\" srcset=\"https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorgalvanico.png 808w, https:\/\/lessnullvoid.cc\/pulsum\/wp-content\/uploads\/2011\/10\/sensorgalvanico-300x203.png 300w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><\/p>\n <\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":"El primer experimento se basa en el uso de un sensor EMF (Electro Magnetic fields). El sensor detecta variaciones en la resistencia de la planta provocados por interferencia. Al acercarnos a la planta modificamos con nuestra resistencia la tensi\u00f3n de la planta provocando un cambio en la lectura. Los sensores dise\u00f1ados a partir de un … <a href=\"https:\/\/lessnullvoid.cc\/pulsum\/emf-exp_1\/\" class=\"more-link\">Continue reading “EMF exp_1”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[9,8,14],"tags":[12,11,10,13],"_links":{"self":[{"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/posts\/38"}],"collection":[{"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":15,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/posts\/38\/revisions"}],"predecessor-version":[{"id":42,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/posts\/38\/revisions\/42"}],"wp:attachment":[{"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/media?parent=38"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/categories?post=38"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lessnullvoid.cc\/pulsum\/wp-json\/wp\/v2\/tags?post=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}