ماژول آلتراسونیک سنجش مسافت HC-SR04

This module stable performance, measure the distance accurately. Can and foreign SRF05, SRF02 ultrasonic distance measuring module and other comparable. Module precision, blind spots (2cm) super close, stable ranging success is to market this product in accordance with the strong! Weight of about 8 g
The main technical parameters:
1. Voltage: DC5V 2. static current: less than 2mA
3: level output: high-5V 4: level output: Low 0V
5: Induction Angle: not more than 15 degrees 6: detection range: 2cm-450cm 7: High precision: up to 3mm
Wiring, VCC, trig (control side), echo (receiving end), GND Ground
This product uses the method: a control port more than send a 10US high, you can wait for a high output at the receiving port has.
You can start the timer output, when this port goes low timer value can be read, this time for this distance of time,
Before calculating the distance. This constant cycle of measurement, you can reach the value of the mobile measurement ~ ~
Works:
(1) The IO trigger ranging to at least 10us high signal; and
(2) module automatically sends eight 40khz square wave and automatically detect whether a signal return;
(3) the signal returned by a high IO output, high duration is
Ultrasonic time from launch to return. Test distance = (high level time * sound velocity (340M / S)) / 2;
This module provides a full set of ranging procedure: C51, PIC18F877, ultrasonic LCD1602 display, ultrasonic LCD12864 display, digital display, serial display, ranging reference program.