{"id":30,"date":"2011-01-10T09:09:27","date_gmt":"2011-01-09T22:39:27","guid":{"rendered":"http:\/\/davidmonro.net\/blog\/?p=30"},"modified":"2011-01-10T09:09:27","modified_gmt":"2011-01-09T22:39:27","slug":"remote-temperature-monitor-project-transmitter-complete","status":"publish","type":"post","link":"https:\/\/blog.davidmonro.net\/index.php\/2011\/01\/10\/remote-temperature-monitor-project-transmitter-complete\/","title":{"rendered":"Remote temperature monitor project \u00e2\u20ac\u201c transmitter complete!"},"content":{"rendered":"

After learning how to use VeeCAD and TinyCAD, I’ve got a layout, and I start the rather tedious process of cutting tracks (with a hand-held drillbit – I don’t happen to own a drill press… yet), then soldering the jumper wires, then the passive components, then measuring resistance here there and everywhere to make sure I don’t have bridged joints etc before finally attaching the chip and transmitter module – and I end up with this:<\/p>\n

\"Component<\/a><\/p>\n

\"Solder-side<\/a>
my not-very-good soldering...<\/figcaption><\/figure>\n

And now I need to test it in the outside world, so a 9V battery and 78L05 regulator later, plus an “enclosure”:<\/p>\n

\"Temperature<\/a>
Yum! Oh wait...<\/figcaption><\/figure>\n

I stick it in the fork of a tree in the back garden, and go back inside to try it out.<\/p>\n

First indications are not particularly encouraging – while my “U U U U U U U U ” sync header seems to be working reasonably well, only about every 5th message is actually making it back to the receiver uncorrupted. Still, I hack together a very quick python script to pull out the data (which does have a checksum), and then I move the receiver (still on breadboard) from the workstation to the server at the other side of the office.<\/p>\n

And then discover something amazing – the noise has all vanished, and all my messages are coming through clean and clear with no garbage between transmissions! Something<\/strong> on my desk must be producing a reasonable amount of noise around 315MHz – my guess is it would have to be one of the monitors. Whatever, my noise problems are now basically solved, and the server is getting data!<\/p>\n","protected":false},"excerpt":{"rendered":"

After learning how to use VeeCAD and TinyCAD, I’ve got a layout, and I start the rather tedious process of cutting tracks (with a hand-held drillbit – I don’t happen to own a drill press… yet), then soldering the jumper wires, then the passive components, then measuring resistance here there and everywhere to make sure […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,7,4],"tags":[8,14,15],"class_list":["post-30","post","type-post","status-publish","format-standard","hentry","category-electronics","category-remote-temperature-sensor","category-sensors","tag-arduino","tag-electronics","tag-sensors"],"_links":{"self":[{"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/posts\/30","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/comments?post=30"}],"version-history":[{"count":0,"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/posts\/30\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/media?parent=30"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/categories?post=30"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.davidmonro.net\/index.php\/wp-json\/wp\/v2\/tags?post=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}