Temperature Readings

Using Arduino Programming Questions
1

Hi

I have
#include <OneWire.h>
#include <DallasTemperature.h>

in my project but what i found is if i unplug, for example, sensor#10 out of my array of 38 sensors it will not display that something is missing there(place for sensor#10) it will be displaying total 37 sensors. So is there a way i can write the value of this unplugged sensor as zero even if its the last sensor? all sensors have a specific location and if #10 is unplugged its wrong to show that value is missing of the sensor #38

Thanks and looking forward to see any suggestions

2

What kind of reading do you see when one is unplugged? It it is wildly off from the plugged in sensors, use that to question the result.

3

When i unplug sensor , doesn't matter which one #10 or #30 or #21 - its comes as zero but not where the sensor was unplugged - it disappears from the list as #38 #37 #36 ... so the last ones in array... can i hold that the sensor 10 was unplugged so sensor 10 readings is zero?

4

If sensor #10 is not in the list, the program can assign a zero temperature for that sensor.

But what good does that do?

5

How does your code determine which sensor is which?

6

savch:
Thanks and looking forward to see any suggestions

Suggestion: post your full code (using code tags).

type
** **[code]** **

paste your code after that
type
** **[/code]** **
after that

7

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Also a link to info/specs on your sensors.

I know its a lot, but at the moment we have no idea what your project comprises of, what format the input data is, how you power all those "sensors" etc..

Thanks.. Tom.. :slight_smile:

8

From DallasTemperature.cpp:

// Fetch temperature for device index
float DallasTemperature::getTempCByIndex(uint8_t deviceIndex){

DeviceAddress deviceAddress;
if (!getAddress(deviceAddress, deviceIndex)){
return DEVICE_DISCONNECTED_C;
}

return getTempC((uint8_t*)deviceAddress);

}

If -127 is returned, set temp for that channel to 0 and continue.