Low Cost Telemetry and Data Logger Turnigy GTY-i6

by yves.morele | October 24, 2020 | (0) Posted in How To

 1 INTRO:             

In a previous article, I describe a low cost GPS data logger for rc aircraft, but without telemetry.

The telemetry is very important in aeromodelling for controlling battery level, altitude and more.

This project describes a very low cost data logger for rc aircraft with real telemetry on the transmitter for put in in a radio controlled plane.

More, the power for arduino be made by the receiver of the plane to have less weight on the plane and with a small size.


2 CHOICE OF MATERIAL :

 

For the microcontroller : Arduino nano generic

For the GPS : UBLOX NEO-6M V2

For the sd card reader/writer : generic but the less weight as posssible

For the box : ABS box

I made this choice so as to have the smallest components possible (I did not choose the arduino micro for lack of memory) and with the least weight.

 

 


3 ASSEMBLING :

The wiring must be done with the minimum length of wire and without the connectors on the electronic cards so as to lighten the final assembly to the maximum.


4 DISPLAYING:

The data is displayed on the transmitter by selecting the sensors and setting the alarm

 

 

5 Schematics:

 

 

6 Code :

 

 

#include <iBUSTelemetry.h> //https://github.com/adis1313/iBUSTelemetry-Arduino

#include <Wire.h>

#include <TinyGPS++.h>

#include <SPI.h>

#include <SD.h>

 

//pin pour carte SD

const int cs_sd=2;

 

TinyGPSPlus gps;

 

#define UPDATE_INTERVAL 500

 

// pin voltage

#define dP A0 

 

iBUSTelemetry telemetry(9); // arduino pin pour donnes iBUS 

 

  

  uint32_t prevMillis =0// neessaire pour updateValues()

 

  //LED 

  

     const int verte = 3;

     const int rouge = 4

 

     float maxspeed = 0speed1 = 0;

     int maxhigh = 0high1 = 0;

     int maxsatelite = 0satelite1 = 0;

 

  float meters ; 

  float voltage=0.0;

  

void setup()

{

  Serial.begin(9600);

 

  

  pinMode(rougeOUTPUT);

  pinMode(verteOUTPUT);

 

  //Condition vrifiant si la carte SD est prsente dans l'appareil

 

if(!SD.begin(cs_sd))    

  {

    

  digitalWrite(rougeHIGH);//absence SD

     return;

  }

 

 digitalWrite(rougeLOW);// carte SD absente

 

     File data = SD.open("donnees.txt",FILE_WRITE);              // Ouvre le fichier "donnees.txt"

     data.println(""); data.println("Demarrage acquisition ibus"); // Ecrit dans ce fichier

     data.println(""); data.println("date      heure       latitude       longitude   altitude    vitesse"); 

     data.close(); 

  

  Wire.begin();

  telemetry.begin(); 

  

 // definition capteurs

  

  telemetry.addSensor(IBUS_MEAS_TYPE_ALT); //altitude

  telemetry.addSensor(IBUS_MEAS_TYPE_EXTV); //batterie

  telemetry.addSensor(IBUS_MEAS_TYPE_SPE); //vitesse km/h

  telemetry.addSensor(IBUS_MEAS_TYPE_GPS_LAT); // latitude

  telemetry.addSensor(IBUS_MEAS_TYPE_GPS_LON); // longitde

 

 

}

 

void loop()

{

    

     updateValues(); 

     telemetry.run();  

}

 

void updateValues()

{

 

// lecture donnes Gps et allumage LED si OK

 

    if (Serial.available()) {

      digitalWrite(verteHIGH);//donnes Gps OK

      gps.encode(Serial.read());

}

 

 

 

  

 

  float meters = (gps.altitude.meters());

  voltage=float(analogRead(dP))*(20/1023.00);

  float airSpeed = (gps.speed.kmph());

 

// definition vitesse max

 

     speed1 = (gps.speed.kmph());

     if ( speed1 > maxspeed) {

      maxspeed = speed1;

     }

 

 

  // recuperation date et heure du GPS pour datalogging

  

       String Temps=String(gps.time.hour()+1)+(":")+(gps.time.minute())+(":")+(gps.time.second());

       String Date=String(gps.date.day())+("/")+(gps.date.month())+("/")+(gps.date.year());

 

// Temporisation

  

    uint32_t currMillis = millis();

 

     if (currMillis - prevMillis >= UPDATE_INTERVAL) { // Code in the middle of these brackets will be performed every 500ms.

         prevMillis = currMillis;

      

  

// affichage donnes capteur sur radiocommande

 

  telemetry.setSensorValue(1, (meters )*100.0  ); //  altitude

  

 telemetry.setSensorValue(2voltage*100  );

 

 telemetry.setSensorValue(3speed1 );

 

 telemetry.setSensorValue(4, (gps.location.lat()*10000000));

 

 telemetry.setSensorValue(5, (gps.location.lng()*10000000)) ;

 

 

  

    // Ecriture des donnes dans le fichier texte

 

    

     File data=SD.open("donnees.txt",FILE_WRITE);

  

     data.println(Date + " " + Temps + " " + String(gps.location.lat(), 6)+" "+String(gps.location.lng(), 6)+(" ")+String(gps.altitude.meters(),0)+(" ")+String(speed1)+(" ")+String(maxspeed)); 

     data.close();

     }

}

 

 

Download the ibus library here

 

 

7 RESULT :

In the next video you can see the result.

The data can be import in google earth for visualisation of the trajectory of the plane.


 


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Low Cost Telemetry and Data Logger Turnigy GTY-i6