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DHT11 humidity and temperature sensor

You require a pullup resistor between the data wire and VCC because the DHT11 uses a bidirectional communication system on a single wire. … A resistor in series with the Arduino's 5V and the VCC of the DHT11 is not a pullup resistor. It is not an arrangement that you would ever want, since it would make the voltage to the DHT11 unstable. …
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