{"id":53,"date":"2021-10-19T08:42:25","date_gmt":"2021-10-19T08:42:25","guid":{"rendered":"http:\/\/pedersen2.dk\/arduino\/?p=53"},"modified":"2021-11-13T08:30:33","modified_gmt":"2021-11-13T08:30:33","slug":"ultra-sonic-sensor","status":"publish","type":"post","link":"http:\/\/pedersen2.dk\/arduino\/index.php\/2021\/10\/19\/ultra-sonic-sensor\/","title":{"rendered":"Opgave 4: Ultralydssensor"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">En ultrasonic sensor udsender en meget h\u00f8j tone som reflekteres &#8211; og man kan p\u00e5 den m\u00e5de udregne afstanden til de objekter tone reflekteres fra. Som en flagermus eller delfin har gjort i tusindvis af \u00e5r. Dette er den f\u00f8rste sensor vi afpr\u00f8ver. <a rel=\"noreferrer noopener\" href=\"https:\/\/www.digikey.dk\/da\/articles\/understanding-ultrasonic-sensors\" target=\"_blank\">L\u00e6s evt mere om teknikken og hvor de anvendes<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"509\" src=\"http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic-1024x509.png\" alt=\"\" class=\"wp-image-54\" srcset=\"http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic-1024x509.png 1024w, http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic-300x149.png 300w, http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic-768x382.png 768w, http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic-850x423.png 850w, http:\/\/pedersen2.dk\/arduino\/wp-content\/uploads\/2021\/10\/ultra_sonic.png 1140w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>int trigPin = 9;\nint echoPin = 10;\nint led = 7;\n\n\nvoid setup()\n{ \n  Serial.begin (9600);\n  pinMode(trigPin, OUTPUT);\n  pinMode(echoPin, INPUT);\n  pinMode(led, OUTPUT);\n}\n\nvoid loop()\n{ \n  long duration, distance;   \/\/ long angiver en variabel som har en talv\u00e6rdi\n  digitalWrite(trigPin, LOW); \/\/ her sendes lyden ud \n  delayMicroseconds(2);\n  digitalWrite(trigPin, HIGH);\n  delayMicroseconds(10);\n  digitalWrite(trigPin, LOW);\n  duration = pulseIn(echoPin, HIGH);\n  distance = (duration*.0343)\/2;\n\n\/\/distance samlet tid fra lyden sendes til den modtages (lydens hastighed) divideret med 2\n\nif (distance &lt; 40)\n{\n  digitalWrite(led,HIGH);\n}\nelse {\n  digitalWrite(led,LOW);\n}\n\n  Serial.print(distance);\n  Serial.println(\" cm\");\n  delay(500);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Kan du s\u00e6tte en ekstra led (eller flere) op som t\u00e6ndes ved forskellige afstande evt. med forskellige blink?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En ultrasonic sensor udsender en meget h\u00f8j tone som reflekteres &#8211; og man kan p\u00e5 den m\u00e5de udregne afstanden til de objekter tone reflekteres fra. Som en flagermus eller delfin har gjort&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-53","post","type-post","status-publish","format-standard","hentry","category-arduino-basic"],"_links":{"self":[{"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/posts\/53","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/comments?post=53"}],"version-history":[{"count":7,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/posts\/53\/revisions"}],"predecessor-version":[{"id":145,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/posts\/53\/revisions\/145"}],"wp:attachment":[{"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/media?parent=53"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/categories?post=53"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pedersen2.dk\/arduino\/index.php\/wp-json\/wp\/v2\/tags?post=53"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}