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： Raspberry Pi 64MP Camera ESP32-S3 Smart 86 Box Development Board with 4 inch 480x480 Display Touch Screen For AI and DeepSeek Raspberry Pi 21.5inch FHD LCD 1080x1920 Capacitive TouchScreen Display For Raspberry Pi/Jetson Nano/ Supports 6V~24V Solar Panel Raspberry Pi 10.1 inch QLED Quantum Dot Display 1280x720 Capacitive Touchscreen For Computer PC/Jetson/Game ESP32-C6 Raspberry Pi 13.3 inch FHD Monitor LCD 1080P Capacitive TouchScreen Display Type-C/HDMI For Computer PC Raspberry Pi 5 RTC Box Raspberry Pi 5 Power Raspberry Pi Pico 2 RP2350A Audio Box 1.85-inch LCD Round 1.85inch TouchScreen Speaker 360x360 IO BASE MINI Board Developer Kit Raspberry Pi Autofocus Camera Raspberry Pi 13.3 inch DSI MIPI Display 13.3inch LCD Capacitive TouchScreen 1920x1080 ESP32 ST7789 configuration Raspberry Pi 5 PCIe to 2.5G Ethernet Adapter Board Plug and Play Raspberry Pi LCD Display Screen 1.3inch LCD with Game Button AND Audio Buzzer For Zero 2W / 3B / 4B / PI5 / RP2040-PiZero Raspberry Pi USB Camera 12MP IMX378 30fps onboard dual microphones Also For Jeston / RDK Luckfox Pico LCD Sipeed NanoCluster Mini Cluster Board mini data center For Raspberry Pi CM45 / Computer /LM3H /M4N

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

TAG： Pi5 Power Raspberry Pi M.2 4G 5G LTE HAT GSM GPRS EDGE RM500 SIM8200 GM800 Samsung ARTIK Rock64 Asus Tinker Latte Panda Raspberry Pi 5 ICE Tower Argon THRML 60mm Radiator Cooler CPU Cooler Copper Tube Fins Raspber Pi 5 5V5A Power R7FA4 Plus A Board Based on R7FA4M1AB3CFM Compatible with Arduino UNO R44 Minima Raspberry Pi 5 PCIe to 2.5G Ethernet Adapter Board Plug and Play ESP32-H2 BLE 4inch LCD IPS Captive TouchScreen 720&amp;amp;times;720 Display Luckfox Pico radar Sensor Raspberry Pi Pico 2 P2350-Plus Smart Car Kit PicoGo2 Autonomous Driving Learning Car Raspber Pi 5 Official Power Computer USB Secondary Screen Raspberry Pi5 PCIe Gigabit ETH USB3.2 HAT+ PI0 2W Computer USB Monitor Screen Industrial USB RS232 RS485 C UART FT232RNL 2m 3.3V 5V Horizon Robotics RDK Ultra D-Robotics Sunrise Arduino MLX90641 USB Monitor Raspberry Pi 64MP Camera