# How to attach temperature prob onto arduino

I was wondering if there was a way to get an output from a TE-631GV-2 temperature prob on an arduino. If so how would you go about this. Thanks!

That is very doable, it, I believe it is a temperature sensing resistor. As jermington post that link but sure it points to the technical data for the probe. If I am correct show resistance and slope or two resistance points.

Thank you all very much for the help! I hope this is sufficient

[quote="andrewtravis, post:1, topic:868044"]
TE-631GV-2

Is a nickel resistance thermometer. It does not change resistance very much with each °C.
Can you tell us the range of temperature you are trying to measure?

You will get very poor resolution without an amplifier. (resolution being A/D counts / °C)

Typical Ni Resistance vs Temperature

I am trying to create an air vent that will open and close under our house using an arduino. This is just what I had around the house and I thought I might try to use it. The temperatures will range from 10 to about 100 degrees F, it doesn’t have to be too accurate, maybe to 5 degrees.

5 degrees F is only 15 ohms out of 1000. I don't see the you being able to measure what you need. My guess is a cheap 5k or 10k NTC would be your best bet.

If I only used it for summer use could it be useful? If so how do I go about coding it to give me outputs

Hello
Take a look to this digital sensor:

@andrewtravis, your topic has been moved to a more suitable location on the forum.

Or of course the DS18b20

The issue is not the temperature range but the small change per degree.

Assume:
Arduino 5V
Internal ref 1.1v

So 0 to 1.1 volt = 0 to 1023 counts.
1 count = 1.1 volt /1024 = 1 mv
10°F = 830 Ohms
100 °F = 1090 Ohms

If you put a 5k ohms in series with your sensor.....

at 70 °F:

delta R/deg = 6 ohms (1000 to 1006 ohms)
I = 5v/ 6000 = 0.8 ma
0.8ma * 6 ohms = 5 mv

Perhaps it won't be so bad after all You would have to check the voltages at the temperature limits and add some filter at the Arduino A/D inputs.

a DS18B20 is a 1-wire device, lots of references on how to use it.

the BME280 offers temperature and humidity, but needs to be pretty close to the Arduino. long wire runs are not suggested.

in any event there are lots of temperature sensors and there is no reason not to play with the one you have to see how well it works.

testing, learning and evaluating is all part of the Arduino experience.

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