Low Cost Telemetry and Data Logger Turnigy GTY-i6

October 30, 2020|yves.morele

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 = 0, speed1 = 0;

int maxhigh = 0, high1 = 0;

int maxsatelite = 0, satelite1 = 0;

float meters ;

float voltage=0.0;

void setup()

{

Serial.begin(9600);

pinMode(rouge, OUTPUT);

pinMode(verte, OUTPUT);

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

if(!SD.begin(cs_sd))

{

digitalWrite(rouge, HIGH);//absence SD

return;

}

digitalWrite(rouge, LOW);// 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(verte, HIGH);//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(2, voltage*100 );

telemetry.setSensorValue(3, speed1 );

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));