Simple serial (virtual COM port) transmit and receive using BluePill (STM32F103C8T6). This also includes setting the line coding and forcing the host to re-enumerate USB on reset (otherwise it is not ...
Speed of sound at 22 °C is 344 m/s. Sound travels 1 cm one way in just 29 us. Calculation: 0.01m / 344m/s = 29 us. But the sound travels from the sensor, hits the obstacle and goes back, therefore ...
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