Accuracy of Detectors (Overall)

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Accuracy of Detectors (Overall)

Post by MoMoney$$$;)0) » February 16th, 2020, 3:58 pm

So I was wondering how exact you guys are getting your detector to be since mine is still around ± 0.5 Degrees and sometimes more accurate, but how exact have you guys gotten you detector to get to place. Thanks!
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Re: Accuracy of Detectors (Overall)

Post by lifeof3.141592 » February 17th, 2020, 8:21 am

MoMoney$$$;)0) wrote:
February 16th, 2020, 3:58 pm
So I was wondering how exact you guys are getting your detector to be since mine is still around ± 0.5 Degrees and sometimes more accurate, but how exact have you guys gotten you detector to get to place. Thanks!
in total or 0.5 degrees per test for a total of 2?

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Re: Accuracy of Detectors (Overall)

Post by MoMoney$$$;)0) » February 17th, 2020, 8:36 am

lifeof3.141592 wrote:
February 17th, 2020, 8:21 am
MoMoney$$$;)0) wrote:
February 16th, 2020, 3:58 pm
So I was wondering how exact you guys are getting your detector to be since mine is still around ± 0.5 Degrees and sometimes more accurate, but how exact have you guys gotten you detector to get to place. Thanks!
in total or 0.5 degrees per test for a total of 2?
Either one is fine, and Thanks for the reply!
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Re: Accuracy of Detectors (Overall)

Post by zandaddy » February 17th, 2020, 9:35 am

I'm assuming you mean plus or minus 0.5 per test. And as for accuracy, all you can do is test. Finding what factors cause inconsistencies in results helped me immensely.

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Re: Accuracy of Detectors (Overall)

Post by LIPX3 » February 17th, 2020, 9:43 am

The biggest suggestion I can give you is to improve your entire set up. More data isn't the solution - if your setup is inherently inaccurate, more data won't do anything. Try to reduce electrical noise as much as possible.

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Re: Accuracy of Detectors (Overall)

Post by jinhusong » February 17th, 2020, 3:44 pm

Depend on what sensor you use.

For TMP36, You should not use its linear formula, come up with your own high level polynomial (or LUT).
More important, its output noice extremely depends on the source. Better use standalone battery pack (like 2AA or 3AA). Still, read like 1000 time and take average. With all these, you may still not be able to get 0.1C resolution, but it should be way better than 0.5C.

For thermistor, normal setup of 10K resistor and 10K thermistor with 1000 average reading should easily get you 0.2C with Arduino UNO, it should get you 0.1C with Arduino DUE.

Student here cuts Steinhart formula into 4 sections with 5 datapoint, got 0.0, 0.0, 0.2, 0.1C.
3 dataPoint direct got like 0.1, 0.2, 0.1, 0.2C.

Hope these help.

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Re: Accuracy of Detectors (Overall)

Post by MTV<=>Operator » February 17th, 2020, 5:56 pm

jinhusong wrote:
February 17th, 2020, 3:44 pm
Depend on what sensor you use.

For TMP36, You should not use its linear formula, come up with your own high level polynomial (or LUT).
More important, its output noice extremely depends on the source. Better use standalone battery pack (like 2AA or 3AA). Still, read like 1000 time and take average. With all these, you may still not be able to get 0.1C resolution, but it should be way better than 0.5C.

For thermistor, normal setup of 10K resistor and 10K thermistor with 1000 average reading should easily get you 0.2C with Arduino UNO, it should get you 0.1C with Arduino DUE.

Student here cuts Steinhart formula into 4 sections with 5 datapoint, got 0.0, 0.0, 0.2, 0.1C.
3 dataPoint direct got like 0.1, 0.2, 0.1, 0.2C.

Hope these help.
When you say normal setup, what type of equation are you using? Also how exactly do you cut the formula into 4 sections?
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Re: Accuracy of Detectors (Overall)

Post by MoMoney$$$;)0) » February 17th, 2020, 7:13 pm

MTV<=>Operator wrote:
February 17th, 2020, 5:56 pm
jinhusong wrote:
February 17th, 2020, 3:44 pm
Depend on what sensor you use.

For TMP36, You should not use its linear formula, come up with your own high level polynomial (or LUT).
More important, its output noice extremely depends on the source. Better use standalone battery pack (like 2AA or 3AA). Still, read like 1000 time and take average. With all these, you may still not be able to get 0.1C resolution, but it should be way better than 0.5C.

For thermistor, normal setup of 10K resistor and 10K thermistor with 1000 average reading should easily get you 0.2C with Arduino UNO, it should get you 0.1C with Arduino DUE.

Student here cuts Steinhart formula into 4 sections with 5 datapoint, got 0.0, 0.0, 0.2, 0.1C.
3 dataPoint direct got like 0.1, 0.2, 0.1, 0.2C.

Hope these help.
When you say normal setup, what type of equation are you using? Also how exactly do you cut the formula into 4 sections?
It's quite easily actually once you know what you're doing, and if you're acquainted with the language you're working with. I'm pretty sure he's talking about using the Stienhart-Hart equation given with a thermistor, and then changing it with some testing.
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Re: Accuracy of Detectors (Overall)

Post by MTV<=>Operator » February 18th, 2020, 5:45 pm

MoMoney$$$;)0) wrote:
February 17th, 2020, 7:13 pm
MTV<=>Operator wrote:
February 17th, 2020, 5:56 pm
jinhusong wrote:
February 17th, 2020, 3:44 pm
Depend on what sensor you use.

For TMP36, You should not use its linear formula, come up with your own high level polynomial (or LUT).
More important, its output noice extremely depends on the source. Better use standalone battery pack (like 2AA or 3AA). Still, read like 1000 time and take average. With all these, you may still not be able to get 0.1C resolution, but it should be way better than 0.5C.

For thermistor, normal setup of 10K resistor and 10K thermistor with 1000 average reading should easily get you 0.2C with Arduino UNO, it should get you 0.1C with Arduino DUE.

Student here cuts Steinhart formula into 4 sections with 5 datapoint, got 0.0, 0.0, 0.2, 0.1C.
3 dataPoint direct got like 0.1, 0.2, 0.1, 0.2C.

Hope these help.
When you say normal setup, what type of equation are you using? Also how exactly do you cut the formula into 4 sections?
It's quite easily actually once you know what you're doing, and if you're acquainted with the language you're working with. I'm pretty sure he's talking about using the Stienhart-Hart equation given with a thermistor, and then changing it with some testing.
Changing it as in adding a constant? I don't see how one could find new coefficients in the 20 minutes of allotted calibration time.
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Re: Accuracy of Detectors (Overall)

Post by MoMoney$$$;)0) » February 18th, 2020, 5:49 pm

MTV<=>Operator wrote:
February 18th, 2020, 5:45 pm
MoMoney$$$;)0) wrote:
February 17th, 2020, 7:13 pm
MTV<=>Operator wrote:
February 17th, 2020, 5:56 pm


When you say normal setup, what type of equation are you using? Also how exactly do you cut the formula into 4 sections?
It's quite easily actually once you know what you're doing, and if you're acquainted with the language you're working with. I'm pretty sure he's talking about using the Stienhart-Hart equation given with a thermistor, and then changing it with some testing.
Changing it as in adding a constant? I don't see how one could find new coefficients in the 20 minutes of allotted calibration time.
More than doable with the right tools. This can be like quickly using a good graphing calculator to take points with corresponding voltage and temperature. Then finding a line of best fit. Personally I've done it in a time crunch, with a little under 20 minutes. Definitely can happen.
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