Veriflite is a fantastic tool for time of flight calculations in the sport of trampolining. The app is good, and the portal is ok. But to have to leave a device runnng all event is somewhat of a pain. I therefore spent way too long looking at their output and have since decoded the data…<\/p>\n\n\n\n\n\n\n\n
Veriflites broadcast a bluetooth low energy (BLE) packet both at bounce events and “random” auxilary data, an example:<\/p>\n\n\n\n
b'J\\x10\\x13Sc\\x02}\\x9e\\t\\x00\\x0c\\x16\\x1b\\x00\\x00\\xc0\\x00\\x01\\x03-W2'<\/code><\/pre>\n\n\n\nVeriflites can either work as a solo sensor or in paired units. When two units pair, they sychronise their clock <\/p>\n\n\n\n
Breaking down this packet of data then, byte 1 is an unsigned interger that counts from 0 to 255. Byte 2 is where things get more intrestings, each byte represents a different data packet.<\/p>\n\n\n\nHex<\/td> Packet Type<\/td> Explanation<\/td><\/tr> 0<\/td> IMPACT_TIME<\/td> A bounce impact of a solo sensor.<\/td><\/tr> 1<\/td> DEPART_TIME<\/td> A bounce depart of a solo sensor.<\/td><\/tr> 2<\/td> IDLE_TIME<\/td> An idle message from a solo sensor.<\/td><\/tr> 3<\/td> BATTERY_VOLTAGE<\/td> The battery voltage of the sensor.<\/td><\/tr> 4<\/td> IMPACT_SYNC<\/td> A bounce impact of a paired sensor.<\/td><\/tr> 5<\/td> DEPART_SYNC<\/td> A bounce depart of a paired sensor.<\/td><\/tr> 6<\/td> IDLE_SYNC<\/td> An idle message from a paired sensor.<\/td><\/tr> 10<\/td> STATUS_FLAGS<\/td> Sensor information such as firmware version.<\/td><\/tr> 11<\/td> DISPLAY_NAME<\/td> The friendly name of the sensor as set by the user,<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n\n\n\n\nSo if we go back to this data packet:<\/p>\n\n\n\n
b'J\\x10\\x13Sc\\x02}\\x9e\\t\\x00\\x0c\\x16\\x1b\\x00\\x00\\xc0\\x00\\x01\\x03-W2'<\/code><\/pre>\n\n\n\nByte Number<\/td> Byte Data (Hex value)<\/td> Explanation<\/td><\/tr> 0<\/td> J (74)<\/td> This is the sequence ID as an unsigned byte, it will get to 255 and reset to 0.<\/td><\/tr> 1<\/td> 10 (16)<\/td> This acts as a packet type (see table below with a key).<\/td><\/tr> <\/td> <\/td> <\/td><\/tr> <\/td> <\/td> <\/td><\/tr> <\/td> <\/td> <\/td><\/tr> <\/td> <\/td> <\/td><\/tr> <\/td> <\/td> <\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"Veriflite is a fantastic tool for time of flight calculations in the sport of trampolining. The app is good, and the portal is ok. But to have to leave a device runnng all event is somewhat of a pain. I therefore spent way too long looking at their output and have since decoded the data…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-13","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/posts\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/comments?post=13"}],"version-history":[{"count":4,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/posts\/13\/revisions"}],"predecessor-version":[{"id":15,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/posts\/13\/revisions\/15"}],"wp:attachment":[{"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/media?parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/categories?post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yeloop.uk\/index.php\/wp-json\/wp\/v2\/tags?post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}