{"id":1866,"date":"2021-01-21T10:08:40","date_gmt":"2021-01-21T15:08:40","guid":{"rendered":"https:\/\/mikew.ca\/wordpress\/?p=1866"},"modified":"2025-01-12T17:09:21","modified_gmt":"2025-01-12T17:09:21","slug":"it-works","status":"publish","type":"post","link":"https:\/\/mikew.ca\/blog\/?p=1866","title":{"rendered":"It works!"},"content":{"rendered":"\n

Yes, my little temperature sensor app works with the real Sense Hat hardware. Here’s a picture. <\/p>\n\n\n\n

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Temperature sense app in action<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Note: that picture is taken in low light so the shutter speed is long enough to catch all of the pixels. You don’t notice the LED scanning with the naked eye, but the camera really shows it (see picture below).<\/em><\/p>\n\n\n\n

When that picture was taken, it was still in a case with a fan, but it was hard to see the display and the fan noise bothered me. I took it out of the case and added a right angle extender to the GPIO connector on the Pi, so the display stands up, which keeps everything cool enough that no fan is required. I then added four risers and the lid off another old Pi case with some rubber feet, which keeps the board off the ground (and also increases the airflow).<\/p>\n\n\n\n

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The new look — it’s showing “25”, but the scan lines weren’t all lit when I took the picture<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

It actually reads a couple of degrees too high, but the accuracy of the readings isn’t all that important as long as it tracks relative temperature values. I tested it by taking it out into my garage (in January), where the temperature dropped, the display turned red, and email was sent. Yay!<\/p>\n\n\n\n

(See part 1<\/a> for more details about the app.)<\/p>\n","protected":false},"excerpt":{"rendered":"

Yes, my little temperature sensor app works with the real Sense Hat hardware. Here’s a picture. Note: that picture is taken in low light so the shutter speed is long enough to catch all of the pixels. You don’t notice the LED scanning with the naked eye, but the camera really shows it (see picture […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[106],"class_list":["post-1866","post","type-post","status-publish","format-standard","hentry","category-tech","tag-pi"],"_links":{"self":[{"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1866"}],"version-history":[{"count":2,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1866\/revisions"}],"predecessor-version":[{"id":2854,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1866\/revisions\/2854"}],"wp:attachment":[{"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mikew.ca\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}