ds18b20 read sequence

Other Hardware Sensors
1

Hello All,

A quick question that Im hoping someone will have a quick answer for:

I have 12 ds18b20 on a one wire bus and use the the following snippets of code to get the addresses of each into an array and then every few seconds poll them.

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//Sub to ping Temp probes and get the serial numbers in order of 
//reading
void PingTemps()
{
   // locate TEMP SENSORS devices on the ONEWIRE bus
  Serial.print("Locating Temperature Devices...");
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  if (!sensors.getAddress(T1, 0)) 
  {Serial.println("Unable to find address for T1");}
  else
  {Serial.print("Temp#1:"); 
    printAddress(T1);
    Serial.println();}
//etc.

//etc.
}

Then in the loop:

//SUB to get temperatures
void getTemps()
{
        sensors.requestTemperatures();
        delay(50);
        //CALL TO PRINT THE TEMP OF Tx
        Serial1.print(sensors.getTempC(T1),1);Serial1.print(",");
        Serial1.print(sensors.getTempC(T2),1);Serial1.print(",");
//etc.
//etc
}

My worry is that that if I (or someone else) replaces a sensor at some time in the future will the array be re-ordered? This would cause a mistake in where I think the temperature is being reported from.

So I'm wondering just how the sequence is determined ? I dont really want to re-compile the Arduino when changing a sensor out if one fails...or am I missing something simple?

Thanks all.

2

SheepRustler:
I dont really want to re-compile the Arduino when changing a sensor out if one fails...or am I missing something simple?

I think what you are missing is how simple it would be to adjust your code in the (rare) event of a sensor failing. This presupposes you know which one is which. But then, what would I know? I don't even understand how you can tell which one is which now.

Maybe the complete code will show that.