💬 Temperature Sensor

[mfalkvidd]

@skywatch just follow the instructions on the build page:

This example uses a modified version of the external DTH library, which is included in the MySensors external examples. Please install it and restart the Arduino IDE before trying to compile.

[skywatch]

Thank you - that did it.

But it would be good to have that info in the file header too, just to call attention to it. Either that or a structured step-by-step tutorial so that things like this don't get left out.

At least it works now though, kul!

[markjgabb]

really silly question.....so does create multiple sensors? so i would have temp1 temp2 or does it combine the value of both for an averaged temprature?
the way i read it it would present mutiple sensors i think?

[gohan]

It creates the sensors that you present during the presentation.

[markjgabb]

appologies for the badly worded questions...the code in its example format....
am i reading it correctly that it presents sensors based on the variable for number of temp sensors?

[gohan]

It will present different sensros according to the #define MAX_ATTACHED_DS18B20 16

[Digdogger]

Hi,
I have only one sensor on the mini pro and I have this in the logs:
2017-07-30 14:41:28.492 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.497 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.501 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.506 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.510 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.515 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.521 (Mysensor) Temp (Congélateur)
2017-07-30 14:41:28.526 (Mysensor) Temp (Congélateur)

Sleep time is set to 60000ms, why the time between 2 messages is around 5ms???

[mfalkvidd]

@Digdogger it can depend on a lot of things. The best way to know is to look at the debug logs from the node and the gateway from the time when it happened. There could be a problem with the communication, with the radios, with the power supply, with the sketch, etc.

It could also be that you're using a microcontroller that doesn't support MySensors sleep, such as the esp8266. But it is just a guess. The information that's usually needed to troubleshoot is listed in https://forum.mysensors.org/topic/666/debug-faq-and-how-ask-for-help/

[Digdogger]

OK thanks mfalkvidd

[ben999]

Slightly off-topic here... but related to this particular sketch

If you look close enough (and copy-paste the sketch into your IDE) you'll witness that one curly-bracket is technically missing at the end of loop()...

But as I added it to the sketch I got error

Sketch compiles fine "with" the missing curly-bracket... ???

Any comment to that (in my sense) funny behavior ?

[mfalkvidd]

@ben999 the simple answer is probably that the backet isn't missing :)

Can you show why you think it is missing?

[ben999]

@mfalkvidd

I must have gone mad then :ghost:

Check the loop()
The last closing curly--bracket is for

for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {

So which one closes

void loop()     {  

If i add one more to "make it right" then hell brakes loose...

sketch_jul31a:110: error: expected declaration before '}' token
 }
 ^
exit status 1
expected declaration before '}' token

1-That's the only sketch behaving this way
2-Even the "IDE-automatic-opening-bracket-finder" (shows which bracket is open when placing cursor on closing bracket) can NOT find the right bracket for loop()...

:scream:

[mfalkvidd]

Interesting observation @ben999

This is caused by the preprocessing directives.

#if COMPARE_TEMP == 1
    if (lastTemperature[i] != temperature && temperature != -127.00 && temperature != 85.00) {
#else
    if (temperature != -127.00 && temperature != 85.00) {
#endif

Only one of these if statements will be active. The Arduino IDE probably doesn't evaluate preprocessing directives, so it sees two if statements and therefore thinks it should see two end braces. A way to "fix" this could be to move the starting curly brace to after the preprocessing directives:

#if COMPARE_TEMP == 1
    if (lastTemperature[i] != temperature && temperature != -127.00 && temperature != 85.00)
#else
    if (temperature != -127.00 && temperature != 85.00)
#endif
    {

This allows the Arduino IDE to parse the code correctly, and correctly match the braces.

[gohan]

It's time to move to a better IDE 😁

[ben999]

@mfalkvidd
Gosh you're a genius ! And you share your knowledge with style and simple explanation ! But i can only upvote you once :D

@gohan
No way :D IDE is nice and simple for nice and simple people like me :rabbit:

[chaeron]

I just upgraded to the MYS 2.1.1 version.

My OneWire temperature sensors were not detected!

I moved the sensors.begin() from setup() to before(), and that seems to have fixed things, and my temp sensors are being detected and read now.

Anyone know why the OneWire library has to be initialized before MySensors setup?

Thanks!

[rejoe2]

@chaeron I assume, you used an old version of the sketch.

Your question most likely is related to a change in the order of the initialisation. This has changed in Version 2.2: from
setup()=>presentation()
to
before()=>presentation()=>setup().

So also the initialisation of sensors had to be reviewed accordingly (eg. to get the number of devices).

[chaeron]

@rejoe2 said in 💬 Temperature Sensor:

@chaeron I assume, you used an old version of the sketch.

That is correct....the original code was written over a year ago. Trying to run it under 2.1.1 caused it to fail.

Your question most likely is related to a change in the order of the initialisation. This has changed in Version 2.2: from
setup()=>presentation()
to
before()=>presentation()=>setup().

So where was this rather major change documented? It would probably have broken any 1-Wire examples, including the temperature one.

So also the initialisation of sensors had to be reviewed accordingly (eg. to get the number of devices).

So I figured out....I went looking for documentation on this rather significant change and was not able to find it noted anywhere.

[rejoe2]

There was a rather small note in the 2.0.0 changelog about the introduction of before().

Btw: Another functional routine (preHwInit() (?)) may have been introduced also with 2.1.1 (?). But until now, all of my sketches and tests got along without this preHwInit() functionality. But imo the new structure is pretty good: before() is helpfull to initialise SPI devices on same bus as nRF24 and to collect relevant info like the number of DS18x20, setup() is now also good to send info you only need once (e.g. the Dallas-Chip-ID).

The rest is - at least afaik - not really documented well, but most examples (if you use the updated ones) will work (apart from the DS18x20 example, where other - external - code changes made some parts tricky to use.

I made some working sketches for the Dallas Sensors some time ago based on some ideas I found here in the MySensors forum; they mostly should still work (exept for the change of getConfig() to getControllerConfig()). If you are interested: here .

Kind regards

[rejoe2]

If anyone is interested:

The sketches in my repo have been updated yesterday for complete compability with the new structure and syntax. They compile fine and should work, but I didn't have the time to make functional tests also.
If anyone is interested, I could also add a multibus example with several Sensors at each bus and different timings for each bus. One of my nodes is working on this concept for several days now (Heizung, RS485 version), so I'm pretty confident this will reliably work for longer periods. But it's rather special:grinning: .