inorder to initialise the sensor, we hae to pull the data line LOW for around 500 us (microseconds) and pull it HIGH for around 20-40 us. After this DHT22 will pull the line low for 80us and than high for 80us.
HAL_Delay is able to provide minimum 1ms delay but when it comes to microsecond, there isn't any predefined function to create 1us delay. In this tutorial, I am going to show you how to create 1 microsecond delay in STM32
Pulse Width Modulation is one of the important functions of timer. PWM is a technique to control analogue circuits with digital output from microcontroller. As you all know that an Analogue signal is the one whose value varies continuously with time whereas digital signals can only be either high or low.