Question

I am having trouble transmitting a float across a simple 2 node Xbee Network.

I am aware that the Xbee system transmits packages via bytes, so I can send a char, but I am having trouble sending anything more than that, and I can’t seem to find any documentation anywhere.

Here is my current (basic) code.

Sender:

(... appropriate setup...)
void loop()
{
  sensorValue = analogRead(analogInPin);
  sensorValueTemp = sensorValue / 9.31; //LM35 measurement into Centigrade
  Serial.print(sensorValueTemp);
  delay(1000);
}

Receiver:

(...appropriate setup...)
void loop() { 
  lcd.setCursor(0, 0);
    if (Serial.available() > 0) {
    lcd.print(incomingByte);
  }
  delay(1000);
}

Any hint as to get the float to be transmitted successfully would be great? Or if it is already being transmitted properly, how to read it properly?

Thanks

Answer 1

You can send the float in bytes and reconstruct the float at the receiver.

The following example may help you:

Sender side:

float x = 1128.476;

char b[sizeof(x)];
memcpy(b, &x, sizeof(x));

// Iterate over b and send bytes
// [...]

Receiver side:

float y = 0;

char b[sizeof(x)];

// Store 4 bytes representing the float into b
// [...]

// Rebuild the float
memcpy(&y, b, sizeof(y));

At the end, you have float y on the receiver side, which has the same representation of float x on the sender side.