There are some DHT11 breakout modules that comes with built-in pull up resistor as the one shown below. Pin 4: GND (ground), connected to STM32 Blue Pill board GND pin.Ī pull-up resistor of 5.1k ohm is required because the DHT11 sensor output is open drain type. Pin 2: data pin, connected to STM32 Blue Pill board A6 pin (PA6), Pin 1 is power supply pin, connected to STM32 Blue Pill board 3V3 pin, The DHT11 sensor has 4 pins (from left to right):
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