HC-SR04 User Guide

Arduino connects ultrasonic sensor for distance measurement

Ultrasonic sensors are suitable for static distance measurement of large flat surfaces. The range of ordinary ultrasonic sensors is about 2cm-450cm, and the resolution is 3mm (the test environment is not so good, and the personal measurement is relatively stable. The distance is about 10cm-2m. If this distance is exceeded, accidental inaccuracies often occur. Of course not Eliminate technical issues.)

The test object is the SRF-04 ultrasonic sensor, which has four pins: 5v power supply pin (Vcc), trigger control terminal (Trig), receiving terminal (Echo), and ground terminal (GND)

How to use the module:

Using this module, occupies two IO ports of the single-chip microcomputer, and one IO port is used as the trigger terminal. One IO port is used as the echo PWM signal capture pin. When writing the program, firstly set the level of 8 40K cycles at the TXD pin, and the program is processed into a PWM signal and output from the RXD pin. Once an echo signal is detected, the echo signal is output for our convenience. When we use it, we only need to read the low level time (T). The echo signal is a distance object proportional to the pulse width. The distance can be calculated from the time interval between the transmitted signal and the received echo signal. Formula: uS/58=cm or uS/148=inch. The formula L=340T/2 can also be propagated in the air by sound waves. You can find L (measured distance). If no reverberation signal is detected, the module’s reverberation signal pin will output a level of about 140uS to prevent the transmitted signal from affecting the reverberation signal.

The working principle of the module:

IO trigger ranging to at least 10us high signal;

module automatically sends eight 40kHz square wave, automatically detect whether a signal return;

a signal to return to a high IO output, high duration of the ultrasonic time from launch to return.

Test distance = (time high * speed of sound (340M / S)) / 2;

Circuit connection method:

Arduino program example:

const int TrigPin = 2;
const int EchoPin = 3;
float cm;
void setup()
{
Serial.begin(9600);
pinMode(TrigPin, OUTPUT);
pinMode(EchoPin, INPUT);
}
void loop()
{
digitalWrite(TrigPin, LOW); //Send a short time pulse to TrigPin
delayMicroseconds(2);
digitalWrite(TrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(TrigPin, LOW);

cm = pulseIn(EchoPin, HIGH) / 58.0; //Convert the echo time to cm
cm = (int(cm * 100.0)) / 100.0; //Keep two decimal places
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(1000);
}

Download: http://pan.baidu.com/s/1zKSbC

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com

TAG： User Guide 0.85inch Screen SpotPear Pi5 Raspberry Pi 5 PCIe to USB Gen1 HUB and M.2 NVMe SSD PI5 Expansion board HAT+ Jetson Orin Nano UGV Beast PT ROS2 AI OpenCV Robot Car MediaPipe Raspberry Pi Pico 2 RP2350 1.69 inch LCD TouchScreen Development Board 240x280 1.69inch Display QMI8658 6-Axis Allwinner H618 Luckfox Pico Pro Xiaozhi-AI-video-tutorial-2 Information ESP32 S3 Raspberry Pi 5 ESP32-C5 WIFI6 Development Board ESP32-C5-WROOM-1 N16R4/N16R8 Raspberry Pi CM5 IO BASE A Mini Board a Base Development Platform Compute Module 5 IO Board ADXL354C Development Board Raspberry Pi 8.8 inch DSI MIPI LCD TouchScreen Display 8.8inch 480x1920 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 Jetson Orin 4G/3G/2G expansion board GNSS GPS SIM7600G-H-M.2 D-Robotics RDK X3 Module Core MD Module Horizon Sunrise Pi ARM Cortex-A53 5Tops Size Compatible With Raspberry Pi CM4 Size Raspberry Pi WatchDog

Ultrasonic Wave Detector Ranging Module PICAXE Microcontroller Sensor HC SR0 for Arduino/51/STM32

TAG： Pi5 Active Cooler Milk-V Duo RJ45 3.5 inch LCD Raspberry Pi 5 Industrial USB Gen1 HUB 4U 7~36V DC power port For Multi Systems 64MP D-Robotics RDK X3 Retail electronic Tag Jetson Nano 5G module Milk-V Arduino MLX90640 7inch LCD 1024&amp;amp;amp;amp;amp;times;600 Computer PC Monitor Display Secondary Screen TypeC USB CPU RAM Windows Flipper Zero CC1101 Raspberry Pi Pico 2 RP2350 2 inch LCD Capacitive TouchScreen Development Board 240x320 Display QMI8658 6-Axis /OV5640 Camera /SD /Battery Port RP2040 Raspberry Pi 60GHz mmWave Radar Sensor High-Precision Human Body PCR For Arduino ESP32 Core3566102000 USB camera 8MP IM678 Excellent low light performance USB 2.0 plug and play ESP32-S3 1.28 EchoEar 1.85 inch Round TouchScreen 1.85inch QSPI LCD 360*360 CST816T ST77916