{"id":227,"date":"2015-01-23T22:14:06","date_gmt":"2015-01-23T21:14:06","guid":{"rendered":"http:\/\/tronche.com\/blog\/?p=227"},"modified":"2019-01-25T21:21:16","modified_gmt":"2019-01-25T20:21:16","slug":"more-on-the-pressure-sensor-battery-level-display-satellite-modem-status-led-decoupling-capacitors","status":"publish","type":"post","link":"https:\/\/tronche.com\/blog\/2015\/01\/more-on-the-pressure-sensor-battery-level-display-satellite-modem-status-led-decoupling-capacitors\/","title":{"rendered":"More on the pressure sensor, battery level display, satellite modem status LED, decoupling capacitors"},"content":{"rendered":"\n<p>Problems with the computation of pressure \/ altitude are solved \n(debugged with a mix of comparing the results with the Arduino output \nand using Bosch release notes).\n<\/p>\n\n\n\n<p>I&#8217;ve added 3 LEDs to get an idea of the battery level during the \nfirst (to come) field tests: 9 to 8V, 8 to 7, below 7 with a 0.1V \nhysteresis. All controlled and powered by the Teensy (and blinking to \nsave some power). \n<\/p>\n\n\n\n<p>I&#8217;ve also added a LED to show the status of the &#8220;net&#8221; pin of the \nsatellite modem. My understanding is that the pin is on when the modem \nhas a satellite in visibility, however it sometimes lit while the signal\n strength reported by the modem is zero&nbsp;??? Not clear, but I like \nblinking LEDs anyway&nbsp;:-). I guess I can&#8217;t draw much current from the \nmodem pin, so the LED is powered on the main 5V through a MOSFET driven \nby the modem status pin.\n<\/p>\n\n\n\n<p>Decoupling capacitors have been installed on every loads (470pF ceramic).<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Problems with the computation of pressure \/ altitude are solved (debugged with a mix of comparing the results with the Arduino output and using Bosch <a class=\"mh-excerpt-more\" href=\"https:\/\/tronche.com\/blog\/2015\/01\/more-on-the-pressure-sensor-battery-level-display-satellite-modem-status-led-decoupling-capacitors\/\" title=\"More on the pressure sensor, battery level display, satellite modem status LED, decoupling capacitors\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95],"tags":[],"class_list":["post-227","post","type-post","status-publish","format-standard","hentry","category-95"],"_links":{"self":[{"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/posts\/227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/comments?post=227"}],"version-history":[{"count":1,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/posts\/227\/revisions"}],"predecessor-version":[{"id":228,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/posts\/227\/revisions\/228"}],"wp:attachment":[{"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/media?parent=227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/categories?post=227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tronche.com\/blog\/wp-json\/wp\/v2\/tags?post=227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}