Universal telemetry for rc plane with android app

             My project is about telemetry for rc planes, in aeromodelism it's important to know some flight parameters like battery level or fuel level, height of the flight, speed of plane and much more.

            When you flight a plane you can't look in the same time a screen with parameters and where is the plane (if you can make that, you are a cameleon) and you must don't stop looking at the plane or the plane go quickly to the ground and it is destroyed.

            Some radio manufacturers offer voice telemetry on their transmitter, but these are top of the range models and very expensive.

            For this reason I thought of making a voice telemetry which is compatible with the different brands, low cost and completely independent of the manufacturers (each brand has its communication protocol, SBUS, iBus etc.., so difficult to make a universal model).

           I had already made prototypes with LILYGO TTGO LORA 868Mhz ESP32 and so I chose this card.

_long distance transmission (more than 500 meters in open field)

_ important memory (32Mo)

• a lot of numbers of connection ports with integrated screen
• wifi and bluetooth
• low weight and integrated battery
• small dimension and small weight (85 grams for the transmitter with battery)

transmitter weight with battery and gps

dimension of the receiver

        The android smartphone bilingual French/English application was developed with MIT APP INVENTOR 2, which allowed me to easily integrate voice alarms and voice requests.

For the moment the voice alarms are:

_ Battery (threshold set according to the type of battery 3S, 4S etc.)

_Height of the plane (fixed at the start)

_ Flight time (fixed at departure)

The triggering of the start of the countdown for the flight time is either vocal or automatic according to the height / speed.

the start screen of the app

Choice of language

here is the alarm screen

Main screen

And the screen for the choice of vocals queries

The flight data are recorded on the smartphone for later use (trajectory plotting in google earth, speed variation, battery voltage, etc.)

comparison with GPS Canmore GT730FL

Height

Speed

Some video with test in flight 

and with voice interrogations

here is the wiring, it is very simple to made it

Add-on variometer with sensitivity and tempo , vocal commands etc.....

update screen with gauges

A new UPDATE

a good friend from the Netherlands tested the system and the flying field being located near an airport there was a lot of radio disturbance which prevented the proper functioning of the system. he therefore added a CRC check and modified the acquisition delay with no blocking in the event of bad data for the backup. I attach Frank Reijn's files, he is a great pilot and he has several passions that I let you discover on his Youtube https://www.youtube.com/c/FrankReijn