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Главная » Для электронщиков и разработчиков электроники » Arduino совместимые контроллеры и платы

HC-SR04 Ultrasonic Sensor Distance Measuring Module

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$1.20
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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:

Using IO trigger for at least 10us high level signal,

The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.

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
Wire connecting direct as following: 1. 5V Supply
2. Trigger Pulse Input
3. Echo Pulse Output
4. GND

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.

More details:

power supply :5V DC

quiescent current : <2mA

effectual angle: <15°

ranging distance : 2cm – 500 cm

resolution : 0.3 cm

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 

Добавил: mehri1982, Пн, 2018-11-19

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