QuadAnt Telemetry

Bluetooth Telemetry Application

QuadAnt telemetry is an app designed to graphically display altitude data as measured and logged by an electronic altimeter for model aircraft, rockets etc. But it can do more then the average altimeter data display. It can show a second and third graph to display other parameters like rate of descent and estimated flight time to ground, which are automatically calculated from the altimeter graph. But measurements from other sensors like speed, accelerations etc. can be displayed as well provided your hardware has the sensors to measure and log these values.

The data are received by the app over a Bluetooth connection and are displayed immediately in a graph. The graphs can be edited by cutting away leading and trailing parts, setting a point in time to zero altitude, zooming in and out etc. A vertical hairline, which can be moved over the graph, allows display of relevant values in a pop-up box. The app includes a free definable moving averaging filter to make the altimeter graph more smooth and accurate. Also a time window for calculating the rate of descent can be set. Of course file management like saving, loading, deleting etc. is possible as is sending a dataset by email. This app requires telemetry hardware, which can send the data over a Bluetooth serial port (Bluetooth direct cable link) at 115200 Baud. The hardware should listen for the character “{“ and then stream the data over Bluetooth to the app. The data should meet the following protocol:

Bluetooth communication is with texts (ASCII). You will send a text just like the example below. The app gives response when the string is completed, all data received and finish character "!" has been taken. The header is seperated by "/", values are seperated by ",", and data sets are seperated by ";". Also end character is "!"

Example Data:

"ExpSpan,2,10,2/7,8,10,13,15,14,13,12,11,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0,0;58,56,33,12,54,33,54,24,76,20,17,15,14,77,87,55,33,56,40,15,14,13,12,11,10!"

Here are: ExpSpan,2,10,2 these are Model Name, data version, time increment and number of data sets.