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  1. Home
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  3. DHT11 sensor

DHT11 sensor

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  • A Offline
    A Offline
    akya
    wrote on last edited by
    #1

    Can anyone know about where i can find the " minimum sampling time" of DHT11 temperature and humidity sensor?

    chisightC 1 Reply Last reply
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    • A akya

      Can anyone know about where i can find the " minimum sampling time" of DHT11 temperature and humidity sensor?

      chisightC Offline
      chisightC Offline
      chisight
      wrote on last edited by
      #2

      @akya the number of times you can read a DHT11 in a given time period isn't limited. You can read as fast as you want. The limit widely mentioned (at various rates of around once every 2 seconds) has to do with the heating effect of turning on current to the temperature sensitive resistor to take a reading. Someone tested and noticed that reading at high speed caused a slightly elevated temperature reading.

      You can test for yourself and see at what read rate you notice an increase, or just limit to once every 2 seconds or less.

      See me on IRC at ircs://freenode:6697/##nodered and ircs://freenode:6697/#mysensors

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