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A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.

MMM-DHT-Sensor - Get temperature & humidity values from a DHT sensor

Scheduled Pinned Locked Moved Utilities
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  • P Offline
    PaulB
    last edited by Jan 28, 2018, 4:53 PM

    Dear @ryck,

    I have installed your module and it works up to the point, where it shows me that “no data is returned”.

    I guess that my wiring is wrong.
    What do you think?

    R 1 Reply Last reply Jan 28, 2018, 11:32 PM Reply Quote 0
    • R Offline
      ryck Module Developer @PaulB
      last edited by Jan 28, 2018, 11:32 PM

      @PaulB Hi Paul

      That happens sometime, it’s related to the way the raspberry pulls data from the sensor, but it should be OK on the next try. Just in case, put a quick updateInterval (like 1 * 60 *1000) and see what happens…

      Also, you can try to get a read directly from the sensor, bypassing the MagicMirror. Just clone this (https://github.com/adafruit/Adafruit_Python_DHT) somewhere and edit and execute this (https://github.com/adafruit/Adafruit_Python_DHT/blob/master/examples/simpletest.py), ie, `python simpletest.py

      Good luck!

      1 Reply Last reply Reply Quote 0
      • P Offline
        PaulB
        last edited by Feb 1, 2018, 6:39 PM

        @ryck
        Thank you for your help! :)
        Finally it works now.

        By the way… the module looks pretty cool ;-)

        R 1 Reply Last reply Feb 2, 2018, 5:30 PM Reply Quote 0
        • R Offline
          ryck Module Developer @PaulB
          last edited by Feb 2, 2018, 5:30 PM

          @PaulB Thank you!

          1 Reply Last reply Reply Quote 0
          • W Offline
            weeee99
            last edited by Feb 3, 2018, 5:32 AM

            ive managed to install the module however the reading show 0 degress and 0% humidity im using a DHT22 btw is this a hardware problem or what? the sensor’s pin 1(Vcc) and pin 4(GND) is connected to a external 3.3v powersouce meaning the pin 2(data) together with a 10k ohms resistor connected in pin 1 and 2 is the only pin connected to the PIs GPIO0_1517635952159_Screenshot (282).png

            R 1 Reply Last reply Feb 3, 2018, 1:12 PM Reply Quote 0
            • P Offline
              PaulB
              last edited by Feb 3, 2018, 12:48 PM

              @weee99,

              It looks like the module is working, so it has to be a problem with your pins.
              I would recommend to try it this way:

              0_1517662084599_n5px8e6humFHzOR4kvYF.png

              1 Reply Last reply Reply Quote 0
              • R Offline
                ryck Module Developer @weeee99
                last edited by Feb 3, 2018, 1:12 PM

                @weeee99 Seems like the module is working… Have you tried to access the sensor directly? Look my previous post in this thread to know how to do it. Make sure that the pin in the correct one (GPIO and physical pins are not the same, so it can be a little bit confusing). Finally, the one I got (https://www.amazon.co.uk/gp/product/B01N6PB489/ref=oh_aui_search_detailpage?ie=UTF8&psc=1) is plug directly to the Pi, no breadboard / resistance required…

                1 Reply Last reply Reply Quote 0
                • M Offline
                  Mo
                  last edited by Aug 20, 2019, 9:35 AM

                  Hello ryck,

                  I have a problem with using your module.

                  When starting MagicMirror the module sometimes stays on “Recieving Sensor Data…” and doesnt actually read the sensor. In rare cases it works, but only once. The module doesnt read the temperature and humidity again and won’t update. I’ve already tried different Update intervals and delaying the initial load time.

                  I’m having this problem since the last update of module. Any ideas?

                  1 Reply Last reply Reply Quote -1
                  • Z Offline
                    Zoltan
                    last edited by Nov 30, 2019, 6:01 PM

                    Hi
                    I have the same problem. Sometimes it will start and show correctly and other times it will just show “Loading sensor data”. When it starts It will then update the values for a few times. It then freeze and just wont update again. It doesn’t disappear like it should for 1/3rd of a second to do the update anymore.

                    1 Reply Last reply Reply Quote 0
                    • B Offline
                      BKeyport Module Developer
                      last edited by Jan 25, 2020, 6:13 AM

                      If the author ever comes back, I’ve made a couple of changes to the module that I’d love to see applied.

                      Floating point trouble, (both temperature and humidity values are coming up as “xx.xxx9999999999”)

                      I have a DHT22, but it did this with the DHT11 too, before I burned it up trying to move it from one board to another.

                      This gives you the tens and rounds off the rest.

                      // Convert C to F
                      			if (this.config.units === "imperial") {
                      				this.temperature = Math.round((data.temperature * 9/5 + 32)*10)/10;
                      			} else {
                      				this.temperature = data.temperature;
                      			}
                      			if (typeof this.temperature !== "undefined" && this.temperature !== null)  {
                      				this.sendNotification("INDOOR_TEMPERATURE", this.temperature);
                      			}
                      			this.humidity = Math.round(data.humidity*10)/10;
                      			if (typeof this.humidity !== "undefined" && this.humidity !== null)  {
                      				this.sendNotification("INDOOR_HUMIDITY", this.humidity);
                      			}
                      			this.updateDom(this.config.animationSpeed);
                      		}
                      

                      The "E" in "Javascript" stands for "Easy"

                      1 Reply Last reply Reply Quote 0
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