SENSORS > Ultrasonic Sensor
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HC SR-04 - Product features:
Ultrasonic ranging module HC - SR04 provides 2cm - 40cm the ranging accuracy can reach to 3mm.
The modules includes ultrasonic transmitter, receiver and control circuit. The basic principle of work:
(1) Using IO trigger for at least 10us high level signal,
(2) The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.
(3) IF the signal back, through high level , time of high output IO duration is the time from
sending ultrasonic to returning.Test distance = (high level time×velocity of sound (340M/S) / 2.
Easy to Interface conversion boads avilable now ( PWM TO UART , OBSTACLE) - based on PIC microcontroller
-> 5V Supply
-> Trigger Pulse Input
<- Echo Pulse Output
-> 0V Ground