{"id":2301,"date":"2019-03-12T21:13:26","date_gmt":"2019-03-12T21:13:26","guid":{"rendered":"http:\/\/www.blog.exrockets.com\/blog\/?p=2301"},"modified":"2019-03-12T22:23:19","modified_gmt":"2019-03-12T22:23:19","slug":"0-3gr-micro-altimeter-vega-mav-with-mpl3115a2","status":"publish","type":"post","link":"http:\/\/www.blog.exrockets.com\/blog\/0-3gr-micro-altimeter-vega-mav-with-mpl3115a2\/","title":{"rendered":"0.3gr MICRO ALTIMETER VEGA (MAV) WITH MPL3115A2"},"content":{"rendered":"<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2303\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1.jpg\" alt=\"\" width=\"1212\" height=\"1015\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1.jpg 1212w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1-300x251.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1-768x643.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/0-1-1024x858.jpg 1024w\" sizes=\"auto, (max-width: 1212px) 100vw, 1212px\" \/><\/a><\/p>\n<p>This micro altimeter is based on the original <a href=\"http:\/\/www.blog.exrockets.com\/blog\/0-3gr-micro-altimeter-vega-mav-with-bmp280\/\">MAV ALTIMETER<\/a> with BMP280 barometric sensor \u2013 it is virtually the same, except the pressure sensor which was replaced by MPL3115A2 and the hardware ID was removed, leaving only the software ID. This altimeter is extremely light \u2013 about 0.35gr and with the battery it weighs less than 1 gram. This device is missing the hardware ID number and therefore it is only partially compatible with the requirements of the FAI association. Please note that this is not a commercial product but free to use and copy for non-profit use under the GNU General Public License.<\/p>\n<p>The main characteristics of this altimeter are:<\/p>\n<ul>\n<li>Size: 8mm x 8mm<\/li>\n<li>Weight: 0.37gr without battery, 0.87gr with battery<\/li>\n<li>Power supply: 2.6v to 4.2v and 1.5mA average consumption<\/li>\n<li>Built-in hardware and software serial number<\/li>\n<li>Unique digital 1min time-altitude signature<\/li>\n<li>Sampling speed is either 20 or 40 samples per second<\/li>\n<li>Total record time 800 or 400 seconds<\/li>\n<li>Adjustable start-preparation time between 1 and 60 minutes<\/li>\n<li>Protection from reversed battery polarity<\/li>\n<li>Capable of working with a single CR927 \u2013 3v battery<\/li>\n<\/ul>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2304\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2.jpg\" alt=\"\" width=\"252\" height=\"176\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2.jpg 1452w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2-300x210.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2-768x537.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/2-1024x716.jpg 1024w\" sizes=\"auto, (max-width: 252px) 100vw, 252px\" \/><\/a><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2305\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5.jpg\" alt=\"\" width=\"160\" height=\"177\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5.jpg 1800w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5-272x300.jpg 272w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5-768x848.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/5-927x1024.jpg 927w\" sizes=\"auto, (max-width: 160px) 100vw, 160px\" \/><\/a><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2306\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1.jpg\" alt=\"\" width=\"165\" height=\"176\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1.jpg 1800w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1-280x300.jpg 280w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1-768x822.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/6-1-957x1024.jpg 957w\" sizes=\"auto, (max-width: 165px) 100vw, 165px\" \/><\/a><\/p>\n<p>The MAV altimeter uses the inexpensive MPL3115A2 sensor which is controlled by the Microchip\u2019s PIC12LF1840 microcontroller and information is recorded in a 512Kb I2C EEPROM memory bank. BTN as indicated in the schematic is not an actual button but two bare pads on the PCB which have to be brought in contact. D2 is there to protect the device from reversed polarity when the battery is connected. Considering the low maximum voltage requirements of the PIC12LF1840 and the MPL3115A2, this diode should have a Vf (forward voltage) of at least 0.6v in order to prevent overvoltage when using a fully charged Li-Po battery up to 4.2v.<\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2308\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1.jpg\" alt=\"\" width=\"2652\" height=\"1107\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1.jpg 2652w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1-300x125.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1-768x321.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV-1-1024x427.jpg 1024w\" sizes=\"auto, (max-width: 2652px) 100vw, 2652px\" \/><\/a><\/p>\n<p>The MAV altimeter is set-up and the information can be downloaded through the USB reader where the MAV altimeter is plugged to. This USB reader has a built in 3.3v power supply for the MAV altimeter.<\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2309\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1.jpg\" alt=\"\" width=\"3564\" height=\"1979\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1.jpg 3564w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1-300x167.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1-768x426.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_USB-1-1024x569.jpg 1024w\" sizes=\"auto, (max-width: 3564px) 100vw, 3564px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2310\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1.jpg\" alt=\"\" width=\"295\" height=\"130\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1.jpg 2871w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1-300x132.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1-768x338.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/3-1-1024x450.jpg 1024w\" sizes=\"auto, (max-width: 295px) 100vw, 295px\" \/><\/a><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2311\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1.jpg\" alt=\"\" width=\"282\" height=\"130\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1.jpg 2323w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1-300x138.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1-768x354.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/4-1-1024x473.jpg 1024w\" sizes=\"auto, (max-width: 282px) 100vw, 282px\" \/><\/a><\/p>\n<p>I made the software for this altimeter of two different applications. The USER application is the main application which is normally used. This application allows you to format the memory (not the Digital time-altitude signature), download and visualize the recorded data. You can also setup the recording speed between 40 and 20 samples per second, and the pre-flight setup time, however you cannot change the software ID number.<\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2317\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1.jpg\" alt=\"\" width=\"1035\" height=\"661\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1.jpg 1035w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1-300x192.jpg 300w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1-768x490.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-1-1024x654.jpg 1024w\" sizes=\"auto, (max-width: 1035px) 100vw, 1035px\" \/><\/a><\/p>\n<p>The SERVICE application is for device maintenance purposes only. Beside the normal USER settings, it allows you to change the software ID number and to adjust the sampling clock. Because the MAV altimeter is using the PIC18F1240 internal clock which is normally accurate within 1%, in some cases it might need adjustment if the accuracy is worsen for whatever reason.<\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/SERVICE-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2318\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/SERVICE-1.jpg\" alt=\"\" width=\"702\" height=\"162\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/SERVICE-1.jpg 702w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/SERVICE-1-300x69.jpg 300w\" sizes=\"auto, (max-width: 702px) 100vw, 702px\" \/><\/a><\/p>\n<p>And finally the flow chart for the MICRO ALTIMETER\u2019s internal logic organization and LED indications.<\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2319\" src=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1.jpg\" alt=\"\" width=\"2820\" height=\"2945\" srcset=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1.jpg 2820w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1-287x300.jpg 287w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1-768x802.jpg 768w, http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/MAV_FLOW-1-981x1024.jpg 981w\" sizes=\"auto, (max-width: 2820px) 100vw, 2820px\" \/><\/a><\/p>\n<p><strong>TECHNICAL AND USER FILES:<\/strong><\/p>\n<p><a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/BOM_MAV-1.pdf\">BOM_MAV<\/a><br \/>\n<a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/BOM_MAV_USB-1.pdf\">BOM_MAV_USB<\/a><br \/>\n<a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/Firmware-HEX-1.zip\">Firmware \u2013 HEX<\/a><br \/>\n<a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/PCB-CADCAM-1.zip\">PCB \u2013 CADCAM<\/a><br \/>\n<a href=\"http:\/\/www.blog.exrockets.com\/blog\/wp-content\/uploads\/2019\/03\/USER-AND-SERVICE-APPLICATION-1.zip\">USER AND SERVICE APPLICATION<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This micro altimeter is based on the original MAV ALTIMETER with BMP280 barometric sensor \u2013 it is virtually the same, except the pressure sensor which was replaced by MPL3115A2 and the hardware ID was removed, leaving only the software ID. This altimeter is extremely light \u2013 about 0.35gr and with the battery it weighs less [&hellip;]<\/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":[42,45,47,46,41,48,44],"class_list":["post-2301","post","type-post","status-publish","format-gallery","hentry","category-electronics","tag-altimeter","tag-fai-altimeter","tag-mav","tag-mav-altimeter","tag-micro-altimeter","tag-mpl3115a2-altimeter","tag-very-light-altimeter","post_format-post-format-gallery"],"_links":{"self":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/2301","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=2301"}],"version-history":[{"count":8,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/2301\/revisions"}],"predecessor-version":[{"id":2326,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/posts\/2301\/revisions\/2326"}],"wp:attachment":[{"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/media?parent=2301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/categories?post=2301"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.blog.exrockets.com\/blog\/wp-json\/wp\/v2\/tags?post=2301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}