{"id":150,"date":"2014-04-16T22:29:33","date_gmt":"2014-04-16T22:29:33","guid":{"rendered":"http:\/\/int03.co.uk\/blog\/?p=150"},"modified":"2019-02-11T21:46:50","modified_gmt":"2019-02-11T21:46:50","slug":"the-pressure-sensor-arrives","status":"publish","type":"post","link":"https:\/\/int03.co.uk\/blog\/2014\/04\/16\/the-pressure-sensor-arrives\/","title":{"rendered":"The Pressure Sensor Arrives&#8230;"},"content":{"rendered":"<p>After much searching, I found a reasonably priced pressure sensor for my project. It&#8217;s a Danfoss AKS 32R, which has 0-300psi range (20.68 bar). It takes a 5V supply, and the output is analogue ratiometric, ranging between 0.5V and 4.5V DC.<\/p>\n<p><a href=\"http:\/\/int03.co.uk\/blog\/wp-content\/uploads\/2014\/04\/pressure_sensor_danfoss_AKS32R.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-151\" alt=\"pressure_sensor_danfoss_AKS32R\" src=\"http:\/\/int03.co.uk\/blog\/wp-content\/uploads\/2014\/04\/pressure_sensor_danfoss_AKS32R.jpg\" width=\"506\" height=\"300\" srcset=\"https:\/\/int03.co.uk\/blog\/wp-content\/uploads\/2014\/04\/pressure_sensor_danfoss_AKS32R.jpg 506w, https:\/\/int03.co.uk\/blog\/wp-content\/uploads\/2014\/04\/pressure_sensor_danfoss_AKS32R-300x177.jpg 300w\" sizes=\"(max-width: 506px) 100vw, 506px\" \/><\/a><\/p>\n<p>No prizes for guessing where I plan to install this sensor!<\/p>\n<p>This is an ebay special, so the first challenge was to track down some more detail on the sensor. The male thread is about&nbsp; 16mm long, and has 8 tracks in 11.4mm which is about 18 TPI. It clearly tapers, and the thread OD is about 13.3~13.8mm, so it looks like a <a href=\"http:\/\/en.wikipedia.org\/wiki\/National_pipe_thread\">1\/4-18 NPT<\/a> thread.<\/p>\n<p>I was keen to see if the sensor worked, so I tried hooking up a meter and blowing into the end. This produced a miniscule change in output voltage. After a bit of&nbsp; research, it seems that maximum lung pressure during exhalation is only about<a href=\"http:\/\/www.sensorwiki.org\/doku.php\/sensors\/air_pressure\"> 2.1psi<\/a> for an adult male, which is less than 1% of the sensor&#8217;s measurement range. Hmm&#8230; that explains why it didn&#8217;t give much of a reading then!<\/p>\n<p>Quite a bit of work will be needed to plumb this in. I might need to fit a pulse snubber to protect the sensor. To be continued&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After much searching, I found a reasonably priced pressure sensor for my project. It&#8217;s a Danfoss AKS 32R, which has 0-300psi range (20.68 bar). It takes a 5V supply, and the output is analogue ratiometric, ranging between 0.5V and 4.5V DC. No prizes for guessing where I plan to install this sensor! This is an &hellip; <a href=\"https:\/\/int03.co.uk\/blog\/2014\/04\/16\/the-pressure-sensor-arrives\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">The Pressure Sensor Arrives&#8230;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150"}],"collection":[{"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=150"}],"version-history":[{"count":2,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150\/revisions"}],"predecessor-version":[{"id":783,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150\/revisions\/783"}],"wp:attachment":[{"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/int03.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}