Ultradzwiekowy miernik odległości: HC-SR04
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Parametry:
napięcie zasilania :5V DC
pobór pradu : <2mA
kąt działania: <15°
odległość mierzona : 2cm – 200 cm
rozdzielczość : 0.3 cm
Opis działania:
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
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