{"id":1009,"date":"2014-10-12T01:14:09","date_gmt":"2014-10-12T01:14:09","guid":{"rendered":"http:\/\/mynoellights.com\/blog\/?p=1009"},"modified":"2014-11-22T11:14:06","modified_gmt":"2014-11-22T11:14:06","slug":"temperature-controlled-fan","status":"publish","type":"post","link":"http:\/\/mynoellights.com\/blog\/?p=1009","title":{"rendered":"Temperature controlled Fan"},"content":{"rendered":"<p>I finally finished one of the outdoor Power Supply Boxes.\u00a0 It contains 2x 350W SMPSs in it and will be situated in the garden.\u00a0 The cabinet currently has a 12v computer fan to push air out of the box. Like all good computer fans this one makes a racket.<\/p>\n<p>So I have set out to make a simple fan controller.<\/p>\n<p><strong>Design Requirement:<\/strong><\/p>\n<ul>\n<li>Operate of 12Volts<\/li>\n<li>Keep fan OFF until needed<\/li>\n<li>At 40degree ( this is my first guess) turn the fan ON slowly)<\/li>\n<li>At 60degree and above make the fan go flat tack.<\/li>\n<li>Between these two set point, the fan speed is to be set proportionally<\/li>\n<li>Capable of driving 3 80mm or 120mm fans<\/li>\n<\/ul>\n<p>the Temperature measurement can be super easy using a thermistor is a basic voltage divider. I have Atmel ATTiny 13 what have ADC and PWM functions.<\/p>\n<p>Update 1:<\/p>\n<p>I scraped the Thermistor idea and went straight toe Dalas DS18S20.\u00a0 I have a number left over from a previous project.<\/p>\n<div id=\"attachment_1013\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Schem.png\"><img aria-describedby=\"caption-attachment-1013\" loading=\"lazy\" class=\"wp-image-1013 size-medium\" src=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Schem-300x168.png\" alt=\"Basic Schematic\" width=\"300\" height=\"168\" srcset=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Schem-300x168.png 300w, http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Schem.png 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-1013\" class=\"wp-caption-text\">Basic Schematic<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">\u00a0Now for the PCB Layout too<\/p>\n<div id=\"attachment_1014\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_PCB.png\"><img aria-describedby=\"caption-attachment-1014\" loading=\"lazy\" class=\"wp-image-1014 size-medium\" src=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_PCB-300x222.png\" alt=\"PWM Fan Controller PCB Design\" width=\"300\" height=\"222\" srcset=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_PCB-300x222.png 300w, http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_PCB.png 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-1014\" class=\"wp-caption-text\">PWM Fan Controller PCB Design<\/p><\/div>\n<p>&nbsp;<\/p>\n<div id=\"attachment_1033\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Biult.png\"><img aria-describedby=\"caption-attachment-1033\" loading=\"lazy\" class=\"wp-image-1033 size-medium\" src=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Biult-300x248.png\" alt=\"Partially Built Fan Controller\" width=\"300\" height=\"248\" srcset=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Biult-300x248.png 300w, http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Biult-1024x847.png 1024w, http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/Tiny13FanPWM_Biult.png 1218w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-1033\" class=\"wp-caption-text\">Partially Built Fan Controller<\/p><\/div>\n<p>Lastly for the Code<\/p>\n<p><a href=\"http:\/\/mynoellights.com\/blog\/wp-content\/uploads\/2014\/10\/18S20Tiny13Fan.c\">18S20Tiny13Fan<\/a><\/p>\n<p>Enjoy.<\/p>\n<p>Update:\u00a0 Below are a several cooling options installed using this fan Controller.<\/p>\n<style id=\"bwg-style-0\">  #bwg_container1_0 {\t\/*visibility: hidden;*\/  }  #bwg_container1_0 * {\t  -moz-user-select: none;\t  -khtml-user-select: none;\t  -webkit-user-select: none;\t  -ms-user-select: none;\t  user-select: none;  }  #bwg_container1_0 #bwg_container2_0 .bwg_slideshow_image_wrap_0 {\t  background-color: #000000;\t  width: 800px;\t  height: 500px;  }  #bwg_container1_0 #bwg_container2_0 .bwg_slideshow_image_0 {\t  max-width: 800px;\t  max-height: 500px;  }  #bwg_container1_0 #bwg_container2_0 .bwg_slideshow_embed_0 {    width: 800px;    height: 500px;  }  #bwg_container1_0 #bwg_container2_0 #bwg_slideshow_play_pause_0 {\t  background: transparent url(\"http:\/\/mynoellights.com\/blog\/wp-content\/plugins\/photo-gallery\/images\/blank.gif\") 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fan to push air out of the box. 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