I think Miguel's logging idea is the best way to know exactly what's going
on. Some additional thoughts:
Based on code, if your program stops receiving data but still runs then it
is probably infinitely blocking at arduino.readline(). The fact that you
don't see output from "print(line)" or print str(LAST_UPDATED) further
supports that. Perhaps there was a transmission error at some point and the
two went out of sync(eg the stop bit is never detected)? When you restart
the script(and re-establish the serial connection), things work fine.
You could try...
-Lowering the baud rate. You can check the AVR data sheet, but I think the
Arduino's error rate is higher for 115kbps than for say 9600bps. The
frequency of your data(based on your sample) doesn't necessarily require a
115kbps transmission rate.
-Adding a timeout to the serial.Serial() constructor. Then do something
like:
while True:
line = None
line = arduino.readline()
if line is None:
arduino.close()
arduino = serial.Serial(...)
else:
#Do all the Xively/email stuff
(This is just a guess, since I don't know exactly what timeout does: raise
an error, returns "None", returns junk? You'll have to experiment.)
Hope that helps.
On Tuesday, September 2, 2014 7:23:28 AM UTC-7, Miguel Aveiro wrote:
>
> Hi Chris,
>
> I don't think the problem is related to the serial port itself. I have a
> python code that uses 4 serial ports of BBB (tty01, tty02, tty04, tty05)
> running without any problem for months.
>
> I saw your code. If it reaches the "Dropping out due to an error: ", I
> don't think it will keep running.
>
> Use the logging module to write to a file when there is an exception:
> https://docs.python.org/2/howto/logging.html
>
> Use repr() instead of the str() to show the error, as it "returns a string
> containing a printable representation of an object.", and it is easier to
> see what's wrong.
> https://docs.python.org/2/library/functions.html#func-repr
>
> If you catch the problem with the logging module, send an email and I can
> help you with more details.
>
> Miguel
>
> On 31-08-2014 22:55, chrism...@gmail.com <javascript:> wrote:
>
> Hi everyone!
>
> I've got my BBB rev. C set up as a data logger for a serial data stream
> from an Arduino. It basically takes this data, uploads it to xively, and
> checks certain values for exceeded thresholds and sends an email if found.
> This works fine. However, after the script has been running for several
> days, it stops working. The script itself seems to continue running, but it
> stops acknowledging that it's receiving any data or trying to upload to
> xively. If I ctrl+c out of the script and restart it, it starts working
> fine again. The device it's connected to continues to work properly
> regardless of whether the BBB is logging anything, so I don't believe that
> the problem is with it.
>
> Is there any way to determine where the problem lies? (BBB, python, etc.?)
> Here's a copy of my code (please don't mock it too much, I'm a Python noob)
> :
> http://susepaste.org/399d9d1f
>
> (This is what the data looks like if it makes any difference:
> 2014-08-31 20:51:38.841985
> 91,h,44
>
> 2014-08-31 20:51:40.063139
> 92,t,72
>
> 2014-08-31 20:51:44.727206
> 92,h,42
>
> 2014-08-31 20:51:45.463794
> 90,t,71
>
> 2014-08-31 20:52:17.112091
> 90,h,44
>
> ...)
>
> I've Googled around, and haven't really found anything regarding something
> like this. There were a couple of random bulletin board posts that seemed
> similar, but they all went off into no-answer-land.
>
> Thanks in advance :)
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