Ultrasonic ranging module hc-sr04 ultrasonic sensor supports uno / 51 / stm32

Data download address: https://pan.baidu.com/share/init?surl=hAAM3JxZ5M5YZU5QQPLQng Extraction code: 3ze1

1. Service voltage: DC5V

2. Static current: less than 2mA

3: Level output: high 5V

4: Level output: low 0V

5: Sensing angle: no more than 15 degrees

6: Detection distance: 2cm-450cm

7: High precision: up to 3mm

Weight: about 8.3g

Wiring mode: VCC, trig (control terminal), echo (receiving terminal), GND ground wire

usage method:

When a control port sends a high level of more than 10us, you can wait for the high level output at the receiving port. As soon as there is an output, you can turn on the timer for timing. When this port becomes low, you can read the value of the timer. At this time, it is the time of this ranging, and then you can calculate the distance. With such continuous periodic measurement, you can reach the value of your mobile measurement~~

Working principle of the module:

(1) IO trigger ranging is adopted to provide high-level signal of at least 10us;

(2) The module automatically sends 8 40KHz square waves and automatically detects whether there is signal return;

(3) When a signal returns, a high level is output through io. The duration of the high level is

Time from ultrasonic emission to return. Test distance = (high level time * sound speed (340m / s)) / 2;

This module can provide a full set of ranging programs: C51, pic18f877, ultrasonic LCD1602 display, ultrasonic LCD12864 display, nixie tube display, serial port display, etc., ranging reference program.

Interface definition: VCC power supply positive trig: control end echo: receiving end GND: Ground

Note 1: the trip pin is an internal pull-up 10K resistance. Pull down the trip pin with the IO port of the single chip microcomputer, and then give a pulse signal of more than 10us.

The out pin is the switching output pin when the module is used as the anti-theft module, and the ranging module does not use this pin!

Note 2: the module should be plugged into the circuit board before being powered on to avoid high-level misoperation. If it occurs, it can be solved only after it is powered on again.

This module can provide the test reference of ranging program: C51, pic18f877, Yilong MCU and three kinds of MCU.

Working principle of urf04 module:

(1) IO trigger ranging is adopted to provide high-level signal of at least 10us;

(2) The module automatically sends 8 40KHz square waves and automatically detects whether there is signal return;

(3) When a signal returns, a high level is output through io. The duration of high level is the time from transmitting to returning

Test distance = (high level time * sound speed (340m / s)) / 2;

The use method of this product is simple. When a control port sends a high level of more than 10us, you can wait for the high level output at the receiving port. As soon as there is an output, you can turn on the timer for timing. When this port becomes low, you can read the value of the timer. At this time, it is the time of this ranging, and then you can calculate the distance. With such continuous periodic measurement, you can reach the value of your mobile measurement~~

Working principle of the module:

(1) IO trigger ranging is adopted to provide high-level signal of at least 10us;

(2) The module automatically sends 8 40KHz square waves and automatically detects whether there is signal return;

(3) When a signal returns, a high level is output through io. The duration of the high level is

Time from ultrasonic emission to return. Test distance = (high level time * sound speed (340m / s)) / 2;