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  • I don't know why but the datasheet says dataline must be connected to 4.7K pullup robocraft.ru/files/datasheet/DHT11.pdf Commented Jul 3, 2021 at 10:32
  • Then it wouldn't be a pull-up resistor; Vcc already is 5V. Signals are what need to be pulled high or kow. Commented Jul 3, 2021 at 10:33
  • @Dave Newton but it seems to me, that when the resistor is connected as shown in the first image, it's in parallel to Vcc-OUT in sensor therefore resistance between 5V and OUT is 0. Commented Jul 3, 2021 at 10:56
  • If you draw a proper schematic, you will see that, in the first drawing, the resistor is between Vcc and Out (also called "data"). It "pulls up" the data/Out pin to a high logic level when there’s no internal or external signal driving it. Commented Jul 5, 2021 at 18:39

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