Some resources to help you getting started with STM32 programming.
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HIGH QUALITY PRE TESTED MODULES.
Ultrasonic ranging module HC-SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit.
The basic principle of work:
Wire connecting direct as following:
If you are sourcing a ultrasonic ranging module, the HC-SR04 is good choose. Its stable performance and high ranging accuracy make it a popular module in electronic market.
Compared to the Shape IR ranging module, HC-SR04 is more inexpensive than it. But it has the same ranging accuracy and longer ranging distance.
There are 4 pins out of the module : VCC , Trig, Echo, GND . So it’s a very easy interface for controller to use it ranging. The all process is: pull the Trig pin to high level for more than 10us impulse, the module start ranging; finish ranging, If you find an object in front, Echo pin will be high level, and based on the different distance, it will take the different duration of high level. So we can calculated the distance easily:
Distance = ((Duration of high level)*(Sonic :340m/s))/2