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DHT11

I am trying to get my DHT 11 from the official arduino store to work (https://store.arduino.cc/grove-temperature-humidity-sensor).

I am following this guide right here: http://wiki.seeedstudio.com/Grove-TemperatureAndHumidity_Sensor/

But I'm only getting invalid output of 0 humidity and 0 degrees.

I hope the image helps in identifying my problem.

On a side note, my sensor looks like a part is missing which is very strange and makes me doubt the right product was sent to me.

Some more information: - Black to GND - Red to 5v - White is wmpty - Yellow to d2 - Using an arduino Uno - Output does not change whether the sensor is actually connect or not. - Total noob at this.

Help would be appreciated a lot!

sensor detail

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  • 1
    that's not a DHT-11 in the photo. Why would they break out a non-connected pin like that? Also, you link to a DHT22 (white plastic), not an 11 (blue plastic)...
    – dandavis
    Feb 8 '19 at 19:14
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    Well yeah the top cover is missing.. Does it carry an electrical connection though? Can you upload a detailed picture of the DHT11 module from above?
    – Maximilian Gerhardt
    Feb 8 '19 at 19:15
  • @Maximilian Gerhardt I have added an image. How do I know if it carries an electrical connection?
    – Jonas Bergner
    Feb 8 '19 at 19:33
  • That is a Grove temperature and humidity sensor module with the si7005 made by seeed studio: wiki.seeedstudio.com/… They also make a module with a DHT sensor, but that is an other one.
    – Jot
    Feb 8 '19 at 19:45
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    Okay, this is not a DHT11 board. This thing has an I2C bus. Either you ordered the wrong product or they sent you the wrong product. You bought the "Grove - TH02 - I2C temperature and humidity sensor" (botland.com.pl/en/grove-series-for-arduino/…)
    – Maximilian Gerhardt
    Feb 8 '19 at 19:45
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You haven't bought a DHT11 module but the Grove - Temperature&Humidity Sensor (High-Accuracy & Mini) / TH02 module.

module

Thus you should use the example code here or follow the guide at seedstudio wiki.

Datasheet of the sensor: https://www.silabs.com/documents/public/data-sheets/Si7005.pdf

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  • That's upsetting. It's not what I ordered. I'll try to follow the guide you suggested and will let you know how that turns out. :)
    – Jonas Bergner
    Feb 8 '19 at 19:54
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    @JonasBergner The sensor on this board has a superior accuracy (+- 0.5°C) when compared to the DHT11 (+- 1 °C) so I wouldn't exactly complain^^
    – Maximilian Gerhardt
    Feb 8 '19 at 20:15
  • ok this actually seems to be the product I have here with me. But i have trouble getting it to work following the instructions. I do understand that I need to connect Red to 5V and black to ground, but what does it mean to connect white to "SDA" and "SCL" to yellow? I'm kinda lost :D. I know youve already helped me a lot. I really appreciate it! @Maximilian Gerhardt
    – Jonas Bergner
    Feb 8 '19 at 21:52
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    @JonasBergner SDA (Serial-DAta) and SCL (Serial CLock) are the 2 signals of the I2C bus. The Arduino Uno has its I2C pins on A4 (SDA), A5 (SCL), this is where the cables need to go. (arduino.cc/en/Reference/Wire)
    – Maximilian Gerhardt
    Feb 8 '19 at 21:54
  • 1
    heck yeah i got it to work! without burning my house down! Thank you so much!
    – Jonas Bergner
    Feb 8 '19 at 21:58

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