{"id":934,"date":"2014-11-22T03:14:06","date_gmt":"2014-11-22T03:14:06","guid":{"rendered":"http:\/\/www.blog.exrockets.com\/blog\/?p=934"},"modified":"2018-03-15T04:42:04","modified_gmt":"2018-03-15T04:42:04","slug":"flight-computer-with-uv-apogee-and-temperature-sensors-breo-uv","status":"publish","type":"post","link":"http:\/\/www.blog.exrockets.com\/blog\/flight-computer-with-uv-apogee-and-temperature-sensors-breo-uv\/","title":{"rendered":"FLIGHT COMPUTER WITH UV APOGEE AND TEMPERATURE SENSORS (BREO UV)"},"content":{"rendered":"

This is another old project that I just finished \u2013 a flight computer with programmable outputs. This flight computer is based on my small digital barometric altimeter, the small accelerometer and the UV apogee sensor.<\/p>\n

\"FRO2\"<\/a>\"BOT\"<\/a><\/p>\n

This flight computer has excellent functionality with 4 high current outputs and the possibility for installation on the outer surface of the rocket body.\u00a0 The main characteristics are:<\/p>\n

– Barometric altitude measurement up to 18km
\n\u2013 High g acceleration sensor
\n– External temperature digital sensor
\n– Audio buzzer for audio indication and tracking purposes
\n\u2013 40 samples per second \/ 13 bit ADC
\n\u2013 7 minutes recording time
\n\u2013 Igniters connectivity check for all four channels (LEDs for each channel will show the status of the igniter)
\n\u2013 USB connection
\n– Serial (USART) port for future communication with wireless telemetry
\n\u2013 6.5 to 16 VDC power supply with on-board ON-OFF switch
\n\u2013 20A (60A pulse) MOSFET for each channel
\n\u2013 Selectable on-time for each channel (between 0.1 and 5 seconds)
\n– Selectable apogee detection method (UV sensor or barometric sensor)
\n\u2013 4 individually programmable outputs where each output can be set up for one\u00a0 of the following events:<\/p>\n

1. DISABLED \u2013 Output won\u2019t fire
\n2.TIME \u2013 Fire after the time elapsed (in seconds)
\n3.ALTITUDE \u2013 Fire as soon as the predetermined altitude is reached (in meters)
\n4.APOGEE-IMMEDIATELY \u2013 Fire at apogee
\n5.APOGEE-TIME DELAY \u2013 Fire n seconds after apogee
\n6.APOGEE-ALTITUDE \u2013 Fire at a predetermined altitude after the apogee has been reached (in meters)
\n7.STAGE BURNOUT \u2013 Fire as soon as the initial acceleration falls below 1 (motor burnout)<\/p>\n

The big difference between this flight computer and other computers is the possibility for frontal assembly on the surface of the rocket fuselage.<\/p>\n

\"FRO\"<\/a>\"SI3\"<\/a><\/p>\n

In order to do that the PCB and the computer assembly is a little bit different than the usual.<\/p>\n

\"PCB_BOT\"<\/a>\"PCB_TOP\"<\/a><\/p>\n

Nevertheless it\u2019s a nice functional device and here\u2019s how it looks like assembled:<\/p>\n

\"SI1\"<\/a>\"SI2\"<\/a>\"BO1\"<\/a>\"FRO1\"<\/a><\/p>\n

The electronic and functional diagrams are shown next:<\/p>\n

\"SCH\"<\/a>\"FLOW_CHART\"<\/a><\/p>\n

Then the next part was to write a suitable desktop application for the USB communication part. This wasn\u2019t really new software because it is based on my other flight computer application with minor modifications.<\/p>\n

\"BREO_UV_2014_11_21_21_52_0\"<\/a>\"BREO_UV_2014_11_21_21_41_20\"<\/a>\"BREO_UV_2014_11_21_21_40_26\"<\/a><\/p>\n

The flight computer passed so far the testing in my improvised barometric chamber and I hope soon to be tested in a real flight.<\/p>\n

 <\/p>\n

MCU Firmware v1.2 (hex file)<\/a>
\nBREO UV APPLICATION v1.00 <\/a>
\nPCB CADCAM FILES<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

This is another old project that I just finished \u2013 a flight computer with programmable outputs. This flight computer is based on my small digital barometric altimeter, the small accelerometer and the UV apogee sensor. This flight computer has excellent functionality with 4 high current outputs and the possibility for installation on the outer surface […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-934","post","type-post","status-publish","format-gallery","hentry","category-electronics","post_format-post-format-gallery"],"_links":{"self":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/934","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/comments?post=934"}],"version-history":[{"count":12,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/934\/revisions"}],"predecessor-version":[{"id":1258,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/934\/revisions\/1258"}],"wp:attachment":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/media?parent=934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/categories?post=934"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/tags?post=934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}