You are not logged in. Your edit will be placed in a queue until it is peer reviewed.
We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.
-
I don't know why but the datasheet says dataline must be connected to 4.7K pullup robocraft.ru/files/datasheet/DHT11.pdfLefteris E– Lefteris E2021年07月03日 10:32:27 +00:00Commented 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.Dave Newton– Dave Newton2021年07月03日 10:33:23 +00:00Commented 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.Maciaz99– Maciaz992021年07月03日 10:56:45 +00:00Commented 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.StarCat– StarCat2021年07月05日 18:39:26 +00:00Commented Jul 5, 2021 at 18:39