REXduino - Communication failure between Raspberry PI and Arduino_MEGA

reitinge

@mtomek Dear Michal,
this 52 51 error (1-Wire bad crc) is usually associated with data corruption during transmission. That's why the peak appeared on the chart. The data is not relevant at this time. Does this error occur often?

Cheers,
Jan

mtomek

@reitinge Hi,
error 52 51 occurs continuously, see below. I only record "peak" in the graph occasionally, because I archive the data every minute, see the graph below.
Michal

reitinge

@mtomek
Hi Michal, we've been thinking about your problem and come to the conclusion that the 1-Wire bus may still be overloaded. After all, you have a lot of those temperature sensors there. Please try to increase the task period from 1 s to 1.5 s or disconnect a few sensors. If both errors and peaks disappear, there is a problem with 1-Wire.

Best regards,
Jan

mtomek

@reitinge Hi,
I have currently 6x 1-wire sensors connected. Each sensor is connected separately to Arduino pins 26 to 31. I increased the task period from 1s to 2s. I did that on September 22nd. Today came a new communication error, see the picture below. The serial line dropped out for a moment. Communication resumed immediately. New fault codes have appeared in the system log.
What could have caused it?
Thanks.
Michal

reitinge

@mtomek Hi Michal,
according to REXduino_slave.ino, the errors mean:

49 52 - Error command - wrong pin number
51 49 - Serial bus buffer is full
49 50 - Error command - unknown command

Unfortunately, I can't say remotely what happened. Have this errors been repeated? Has there been an error 52 51 since the last time?

Cheers,
Jan

mtomek

@reitinge Hi Jan,
I continuously monitor the system log. None of the errors (49 52, 51 49, 49 50 or 52 51) that I solved last time have come. Errors still occur 52 51. I replaced one of the 1-wire sensors that oscillated the most, so there are fewer errors, about 10 errors a day (see below).
It would not be bad if the system log could list the REXLANG error even with the pin where the errors occur. This would make it easier to find out which sensor has the most errors.
Best regards
Michal

reitinge

@mtomek Hi Michal,
I think you can track the PIN number where error occurs when you configure the system log, as described in the last point of the Troubleshooting section described here: https://github.com/jaroslavs/REXduino/blob/master/REXduino_User_Guide.pdf.

Cheers,
Jan

mtomek

@reitinge Hi Jan,
it's been a long time since I had communication problems between Raspbery PI and ArduinoiMega - REXduino. See previous communication problems. I did not make any significant changes in SW.

In the last 2 days, there have been 2 communication failures:

This indicates an error related to the checksum of the 1-wire measurement as explained to me in the previous answer. This could be explained by ordering some 1-wire measurement.

But what I don't understand is that there are a lot of warnings:

What does the warning "REXduino slave warning, code: 1 1" mean please?

Is there a description of all error codes and warnings somewhere?

Thanks a lot.
Michal

mtomek

@mtomek Hello gentlemen,
can someone please respond to my last question pleas?
Thanks a lot!
Michal

Jan Reitinger

@mtomek Hello,
I'm really sorry—I somehow overlooked the fact that you were posting in this old thread. The "Warning 1 1" indicates that the buffer for serial communication between the Master and Slave devices is full:

#define WARNING_SERIAL 1
#define WARNING_SERIAL_BUFFER_FULL 1

Have you added any new data communication or changed the communication speed recently? I’d also like to point out that REXduino is a third-party project, and we don’t have direct control over it. I found the explanation for the warning directly in the source code here:
https://github.com/jaroslavs/REXduino/blob/master/REXduino_slave/REXduino_slave.ino

Cheers,
Jan