Max31850
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Please be positive and constructive with your questions and comments.
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Max31850
I am using this tutorial"https://learn.adafruit.com/adafruit-1-w ... g-and-test" to measure temperature of multiple k-type thermocouples with MAX3850. I have two problems working with this setup: 1. the resolution is zero but in tutorial it shows 12.
2. it always shows the temperature as 0 C (32 F)
Would you please help me to find where the problem is?
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
This is the snapshot of connections in parasitic power on.
- Attachments
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- 000.jpg (262.65 KiB) Viewed 561 times
- adafruit_support_bill
- Posts: 88088
- Joined: Sat Feb 07, 2009 10:11 am
Re: Max31850
It is hard to see in your photos, but I don't see a ground connection between the Arduino and the rest of your circuitry.
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
Closer shots of the circuits are attached.
Same result with external and parasitic power
Same result with external and parasitic power
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- img_2299.JPG (102.49 KiB) Viewed 533 times
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- IMG_2298.JPG (433.81 KiB) Viewed 533 times
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- IMG_2297.JPG (604.87 KiB) Viewed 533 times
- adafruit_support_bill
- Posts: 88088
- Joined: Sat Feb 07, 2009 10:11 am
Re: Max31850
From the output, it looks like the 1-wire interface is wired properly. What thermocouples are you using. Have you tested them independent of the 31850 boards?
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
I am using K-type thermocouples and tested them. They work properly and showing room temperature (23C).
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
So, where is the problem? Why do thermocouples show 0c when they are connected to 31850?
- Franklin97355
- Posts: 23910
- Joined: Mon Apr 21, 2008 2:33 pm
Re: Max31850
Try moving the circuit to a different place on the breadboard and using only one board until we get this sorted.
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
I moved the circuit to a different place and it still is not working.
- adafruit_support_bill
- Posts: 88088
- Joined: Sat Feb 07, 2009 10:11 am
Re: Max31850
Have you tried wiring just one of the MAX31850 boards? We are not sure what the issue is at the moment. We are consulting with some of the other engineers.
- moeini
- Posts: 10
- Joined: Fri May 01, 2015 11:10 am
Re: Max31850
I downloaded all the libraries again and it magically worked.
Thanks BTW for your help.
Thanks BTW for your help.
- adafruit_support_bill
- Posts: 88088
- Joined: Sat Feb 07, 2009 10:11 am
Re: Max31850
Glad it is working for you. We were all puzzled because we have not seen that problem before.
Please be positive and constructive with your questions and comments.