{"id":1789,"date":"2024-09-04T11:58:16","date_gmt":"2024-09-04T18:58:16","guid":{"rendered":"https:\/\/unixwizardry.com\/?p=1789"},"modified":"2024-10-18T09:51:29","modified_gmt":"2024-10-18T16:51:29","slug":"rain-gauge-retrofit-almost-done-but","status":"publish","type":"post","link":"https:\/\/unixwizardry.com\/index.php\/2024\/09\/04\/rain-gauge-retrofit-almost-done-but\/","title":{"rendered":"Rain gauge retrofit ALMOST done…but.."},"content":{"rendered":"\t\t
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So here is a picture of my ALMOST finished rain gauge 1-wire counter refit.\u00a0 It works great EXCEPT the coin cell is SUPPOSED to power the DS2423 counter in the event the 1-wire bus is disconnected.\u00a0 I thought it was weird that when I was doing testing of my 1-wire library, shorting the bus to ground, that the count would zero out.\u00a0 Well, nuts, for some reason it’s not saving the count. \"\" (The PCB LOOKS nice though. \ud83d\ude42 )\u00a0 On my breadboarded version it works as planned; the count is preserved even if the MicroLan (1-wire bus) is disconnected.\u00a0 The coin cell’s 3V appears at the VBAT pin of the DS2423 on the breadboarded version but not on my PCB \ud83d\ude41\u00a0 After taking some measurements, apparently either I have a bad BAT54S Schottky diode at D2 (pointed to with pencil) or a bad solder connection.\u00a0 \"\"Hope it’s the latter, but thankfully I have spare diodes.\u00a0 The only saving grace was that I found this out BEFORE I installed it in the backyard.<\/p>

UPDATE:\u00a0 The Schottky diodes are fine; I determined it’s a bad solder connection on D2 Pin1.\u00a0 With the coin cell installed, and measuring the voltage on pin 3 of D2, when I press down on the diode, voila!, <\/em>I see about 3 volts on its pin 3, which is the way it’s supposed to work.\u00a0 So now back to the soldering station.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

So here is a picture of my ALMOST finished rain gauge 1-wire counter refit.\u00a0 It works great EXCEPT the coin cell is […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,38],"tags":[],"class_list":["post-1789","post","type-post","status-publish","format-standard","hentry","category-electronics","category-weather-instruments"],"_links":{"self":[{"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/posts\/1789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/comments?post=1789"}],"version-history":[{"count":7,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/posts\/1789\/revisions"}],"predecessor-version":[{"id":1801,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/posts\/1789\/revisions\/1801"}],"wp:attachment":[{"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/media?parent=1789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/categories?post=1789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unixwizardry.com\/index.php\/wp-json\/wp\/v2\/tags?post=1789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}