nothing in the debug log

[AndrewZ]

Hello everyone
My plan was to catch weather information from my old outdoor La Crosse TX-2U sensor, but for some reasons I see nothing in the debug log. I expected to see either something decoded or at least some raw debug data, but I see nothing [from the sensor].

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20;00;Nodo RadioFrequencyLink - RFLink Gateway V1.1 - R45;
10;version;
20;01;VER=1.1;REV=45;BUILD=09;
10;status;
20;02;STATUS;setRF433=ON;setNodoNRF=OFF;setMilight=OFF;setLivingColors=OFF;setAnsluta=OFF;setGPIO=OFF;setBLE=OFF;setMysensors=OFF;
10;rfdebug=on;
20;03;RFDEBUG=ON;

At the same time I'm pretty sure that the hardware I have is working.
I used the same Arduino, same receiver (YXR15), same pins and even cables with a sketch called TX6U-Monitor I found somewhere. With that sketch I was able to catch some data from the sensor. The actual values received were wrong though. The only change I made for RFLink was the power line - I moved this wire from 5V to Pin 16.
Looking for ideas/suggestions.
Thanks!

[Stuntteam]

Move it back to 5 volts..

[AndrewZ]

taking power from 5V pin does not help

[Stuntteam]

Isn't that sketch for an Arduino Uno?
It also would use interrupts..(and thus the interrupt pin)

Maybe you can tell a bit more on your pinout.. Are you using a Mega?

[AndrewZ]

This is the sketch I used for testing: https://github.com/andreacioni/TX6U-Monitor

I've tested both pins here - 2,0 (default) and 19,4 (to be in sync with RFLink):

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TX6U t(2,0); //Arduino UNO pin 2 -> interrupt 0

I'm using Mega 2560, receiver data pin connected to pin 19, all according to the instructions.

[Stuntteam]

I could not find a datasheet of the YXR15.
Is it 433 or 315mhz?
Does it have 4 pins on one side with one pin labelled CE? If so, is this pin attached to VCC either directly or on the YXR15 PCB?

[AndrewZ]

It is 433MHz.
It has 4+2 pins, CE pin has no external connection, but on PCB it is connected to Vcc over 10k resistor.
Thank you for looking into my issue.

[Stuntteam]

Ok, CE usually means "Chip Enable" you should be able to control the module with it, a datasheet should explain how.
So I figure this is the correct wiring:
pin 1 VDD = MEGA VCC 5 volts
pin 2 DATA = pin 19
pin 3 GND = ground
pin 4 CE = unused (internally connected to vcc)
pin 5 GND = ground
pin 6 TX = Antenna, connect a ~16.8 cm wire (or an actual 433 mhz antenna but wire works fine)

Once wired and rflink firmware is flashed there is in most cases some kind of activity in debug mode.
I believe the TX6U is supported.
Even when data/packets are not recognized, the debug data showing pulses should appear.

If there is no data in debug mode for a longer period of time your module might not be supported.
Some modules are designed for 3.3 volts and the 0/1 treshold (difference in voltage to indicate high/low signals) is too low for the mega to see even when they can be powered with 5 volts.

A side effect of the cheaper RF modules is that they pump up the signal when nothing is received and as a result start to believe that random noise is part of s signal.
RFlink filters most of this out. Possible the tx monitor is not and was therefor giving incorrect data.
Maybe you should try a different RF module.

[AndrewZ]

Sounds logical, but situation is still weird because TX6U Monitor keeps providing some sustaining output:

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Message recognized from LaCrosse TX6U device!
ID: 32
Temperature: 6.91 °C

Message recognized from LaCrosse TX6U device!
ID: 32
Temperature: 6.58 °C

Message recognized from LaCrosse TX6U device!
ID: 32
Temperature: 6.19 °C

It is not +6 outside, that's why I said data is incorrect, but the data shown is not random and probably real temperature is reflected with some offset.
I will try with another RF module as soon as I get one. Thank you for your comments.

[AndrewZ]

Changed receiver to RXB6 and everything works as it should.

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20;24;LaCrosse;ID=0400;TEMP=000e;

In order to get real temperature I probably need to convert hex to decimal then divide by 10 - right?
0e (hex) == 14 (dec), La Crosse display shows 1.4 outside.

Thanks!!

[Stuntteam]

This is probably caused by a pullup.. there will be something for that in the next release

Indeed values are transmitted in hexadecimal and multiplied by 10