# [Solved] Problem with float from 8-bit Arduino to Due

Hi, I´m trying to receive 3 float from an 8-bit Arduino Mini, which I know that it manage 4 bytes float, in a 12 byte array. But I´m having troubles to convert it to Due´s float because I do not understand at all, how many bytes have a float in the Due, (I think the float in Due it´s like an double, 8 bytes). I hope someone could confirm me that the Due´s float are 8 byte in memory and tell me how to convert a 4 bytes float to a 8 bytes float, I´m trying to do it with "union" with no results.

Thanks and regards.

Update: I found "Sizeof" function in the reference, I will test it on the Due and I will post the results.

Finally it works XD

sizeof() told me that float are 4 bytes long and double are 8 bytes long on Due, I didn’t understood well in the reference

``````//  Test code to send binary data from 9 DOF Razor IMU to Arduino Due
//
//  Programa de Prueba para comprobar que el Arduino Due recibe correctamente
//  los datos del 9 DOF Razor IMU y los procesa.
//
//  Miguel Angel Ruiz 2013

const int TOTAL_BYTES = 12 ; // the total bytes in a message
char MESSAGE [12] = {'N','N','N','N','N','N','N','N','N','N','N','N',};  //  String for testing

union y_tag {
byte by[4];
float yval;
} y;

union p_tag {
byte bp[4];
float pval;
} p;

union r_tag {
byte br[4];
float rval;
} r;

float yaw;
float pitch;
float roll;

void setup(){

delay(3000);

Serial.begin(115200);
Serial1.begin(57600);

Serial.println("Iniciando IMU");
Serial1.print("#oe0"); // Disable Error Output
Serial1.print("#ob");  // Binary Output Format Selected
Serial1.print("#o0");  // Disable Continuos Data Streaming

delay(3000);
Serial.println("Arranque listo, comenzando");
Serial.print("Mensaje de prueba -> ");
for(int i=0; i<12; i++){
Serial.print(MESSAGE[i], HEX);
}
Serial.println("");
Serial.print("->");
Serial1.print("#f");  // Request one frame of data

}// Fin de setup

void loop(){

if ( Serial1.available() >= TOTAL_BYTES){

yaw = y.yval;

pitch = p.pval;

roll = r.rval;

Serial.print("Received IMU msg, Yaw = ");
Serial.print(yaw, 2);
Serial.print(", pitch = ");
Serial.print(pitch, 2);
Serial.print(", roll = ");
Serial.println(roll, 2);

/*    for(int i=0; i<12; i++){          //  Old code for testing
Serial.print(MESSAGE[i],HEX);
}
Serial.println("");
Serial1.print("#f");*/
Serial1.print("#f");                 //  Request another frame of data
}//
}// Fin del loop
``````