The WORKBENCH part 3

ok… I’ll write an introduction with some links to your work and BLOG

btw… Cayenne LPP also integrated ?

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Well, yes sensors format but I don’t use the library, just hard code value depending on sensor

    uint8_t len = 0;
    uint8_t dev_idx = 1;
    uint8_t payload[32] ; // Max, not all will bu used, len is calculated on each data added
    uint8_t *p=&payload[0];
    uint16_t value;
    // This is very important, since we need to check battery voltage
    // you don't need to do this each wake up, but twice a day sounds good
    value = ulpn.readVBatAverage() / 10;
    *p++ = dev_idx++;
    *p++ = LPP_ANALOG_INPUT;
    *p++ = value >> 8;
    *p++ = value;

    #if DEBUG > 1
    DebugF("mV VBat=");

    value = ++frameCounter;
    *p++ = dev_idx++;
    *p++ = LPP_ANALOG_INPUT;
    *p++ = value >> 8;
    *p++ = value;


    #ifdef USE_SI7021
    if (ulpn.status() & RF_NODE_STATE_SI7021) {
      // Do a reading values OK ?
      if ( ulpn.si7021_readValues()==0 ) {

        // Now 291 means 29.1
        value = ulpn.SiTemp()/10 ;

        #if DEBUG > 0

        *p++ = dev_idx++;
        *p++ = LPP_TEMPERATURE;
        *p++ = value >> 8;
        *p++ = value;

        value = ulpn.SiHum();
        #if DEBUG > 0
        // Now the RH value 
        *p++ = dev_idx++;
        *p++ = value*2;
    } else {
      #if DEBUG > 0
      DebuglnF("No SI7021");

perfect !

  • running to the workbench to find an SI7021 :rofl:


I thought 'anti static ect ’ and they looked ok on the pictures So I ordered them.
arrived today, I could fit 3 fingers :roll_eyes:… must be for little chinese children in Iphone factory’s
and the quality… aaargh :rofl:


  • update
    the shop offered (I didn’t ask for it) me my money back, IF I would change my negative comments. (didn’t even know that is possible)
    These 'gloves are probably made in a cellar in Pakistan, Vietnam So I leave it… it’s useless garbage.

Simple, no regulator, nothing, just what you need

Nice isn’t it ?



yep… looks very nice. :smiley:
I did that too, but noticed problems after a while with humidity values not being correct with a sensor
inside that enclosure.

Interesting, did you find out the issue? moisture on the sleeve?

yes inside … very fine, gave most problems in cold weather/after rain, when the droplets formed



I need to test with coating spray on PCB :wink:

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to test that effect I was planning (but always 10 things at the same time) to build a special sensor, one that is inside its own chamber.
when you want to measure the mcu start the airpump for a few seconds just to let fresh air in.
and then measure and compare with the sensor in the casing.


but… you know how things go… :sunglasses:

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I can’t believe it, 2 years later I see Cayenne still not including a basic number (counter, whatever, …) I just need to send a number and see it without any calculation. I just want to send a field, even without unit, just a number, that’s too complicated, I guess so!

Guys, come on !!!


LPP 2.0 next month ? cool

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It looks pretty there is too much thermal mass around the sensor.

How and where do you find those enclosures for sensors?

I need something similar but don’t know the keywords.

I am happy to look in to it and contribute. However due to the holidays coming months it will delay until mid september before I have time available. That of coarse when you accept my help.


found them on the best LoRaWAN board :wink:

No problem I also need to put code on github, may I have your github account by pm?

@BoRRoZ, could you please create the dedicated topic so we can continue discussion on it? thanks

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A new delivery of Temperature and Humidty sensors has arrived for our TTN-Apeldoorn Heat stress project we do in coorporation with our township.


done… if its ok with you sofar ?

btw … I wanted to put your company site in the topic start
Houston… you have a problem :wink:

but what’s inside that plastic wrap ? … I’m always curieus :wink: