Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

dwinhold — Sun, 21 May 2017 20:09:14 GMT

Problem solved, cost money needlessly though. I got so frustrated I purchased LM35 sensors as I couldn't for the life of me get the one wire sensors working. I bought the new sensors through Newark and they arrived Friday (Great delivery time). Did a simple program to test them, didn't work. Tried for the past 2 days with no avail, searched online finding that others had the same issue but no answers. Finally came across a posting in one forum from a week ago by someone having the same issue but there was a reply that solved everything, it read, "There is an issue with Energia and the MSP432 boards, there is an update now released for this board that fixed the sensor reading issue. If you are using version 1.6.0 you need to update to 1.6.1"

So I updated to the new release, re-compiled my coding and guess what.... It works, my original code works with the sensors. I will include this in my next blog as I am now able to continue on my project and write a good update to everything!!!\

Dale Winhold [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-79d76483-bb1f-496d-b0a8-fb2ba2d97fbf/contentimage_5F00_1.png:16:16]

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

mcb1 — Sun, 14 May 2017 22:16:39 GMT

[mention:1bc1ed25c74e4385bcbca428cd9ea7e7:e9ed411860ed4f2ba0265705b8793d05]

4k7 is the 'default' value for the pullup resistor.

Pascal ( [mention:6d93ea79e62745088ec2489828c0ce1e:e9ed411860ed4f2ba0265705b8793d05] ), one of the challengers in Forget Me Not had some issues with multiple sensors at distance and resorted to different value resistors.

Pas Home / 1-wire vs Tektronix oscilloscope

Mark

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

DAB — Sun, 14 May 2017 18:37:12 GMT

Have you considered that the MSP430 code is 16Bit and the 432 is 32Bit?

For a quick and dirty temperature sensor, use the inexpensive LM35 and an A/D channel.

DAB

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

msimon — Sun, 14 May 2017 14:51:38 GMT

Hi [mention:1bc1ed25c74e4385bcbca428cd9ea7e7:e9ed411860ed4f2ba0265705b8793d05],

It is said to here your code is not working. I hope you will find a solution and make it work. However, if you can't find a solution and want to buy another temperature sensor, I have used TMP102 and it is working fine with TI-RTOS on MSP432.

Mehmet

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

dwinhold — Sun, 14 May 2017 14:28:39 GMT

Thank you guys for all the help, I will try all your suggestions. It looks like a very busy week for me, I will keep everyone updated on this issue and my progress.

Dale

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

balearicdynamics — Sun, 14 May 2017 12:37:42 GMT

Hi Dale,

it seems that the 1-Wire temperature sensors (and other sensors) interfacing with the MSP320 reports some well-known issues. This is one of many links I have found about this problem: https://github.com/energia/Energia/issues/65 and it seems that it is a sort of problem in the Energia IDE. Take in account that also in past with MSP 430 when I road tested I have found many crap libraries, some working bad and so on. I have not the possibility to test it directly here but it sounds not so strange to me that there are problems.

Related to your specific problem with the temperature sensor it seems that this guide can be helpful to you: http://karve.in/?p=1408 as well as this other link 1-Wire and MSP430 | welcome to the world of... with special attention on a more detailed software examples.

As it seems a bug in the 1-Wire library this link can also be useful: https://www.pjrc.com/teensy/td_libs_OneWire.html seems a version of the library full working.

Let me know what happens and if the problem persists I will try to investigate more in depth. The sources you are using are those published in the previous posts ?

Enrico

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

Jan Cumps — Sun, 14 May 2017 12:27:10 GMT

... logging a help request on the e2e.ti forum, under MSP342 area, also often helps. Certainly when you make clear that you are a beginner and that you're participating in this design challenge.

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

Jan Cumps — Sun, 14 May 2017 10:34:23 GMT

Can you post the code that works on the MSP430 and crashes on the MSP432? More eyes can have a look at it then.

I don't have the DS18B20 but there should be no reason why the MSP432 would be unable to use it.

Where does your code crash?

RE: Safe and Sound : Winter/cold weather survival suit Post #10 (Help needed and an update)

dougw — Sun, 14 May 2017 06:53:12 GMT

I can imagine the frustration...

Are you using a separate power wire to the DS18B20 (it may be a bit safer to use 3 wires than just 2)

Presumably you are using a 4.7K pull-up.

Have you tried adapting arduino code to work with energia? Maybe it would work better than the energia code.

One thing to check is if the signal pin is assigned correctly - energia uses a different convention than the way most launchpads are numbered.

I just had to re-document it as I was confused. I'll post the energia pinouts for this launchpad if I can get a blog out tomorrow.

It would be useful to look at the pin with a scope to see if it is being controlled by the MCU, and if the device responds.

I don't know much about these devices, but presumably you need to be accurate with their 64 bit address, so the discovery phase and sequence is important.

Another thing to check is how the code does the serial timing - presumably it is bit-banging, but maybe they were careless with the code and the faster speed of the 432 messes up the serial rate.