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： Milk-V Duo Tutorial Raspberry Pi DSI 800×480 Pi5 Power PoE-M.2-HAT+B User Guide Raspberry Pi CM5 Official Original IO Board a Base Development Platform Compute Module 5 IO Board ESP32 1.54 inch E-Paper Smart Watch display Screen 200x200 Ultra-low power For Arduino/Micropython/RTOS For Watchy AURORA AI Laser Radar And Dual Eye Camera IMU Integrated Positioning Map For Android/ROS+RoboStudio Industrial USB TO RS232/485 Serial UART Converter FT232RNL Compact Size NVIDIA Jetson Orin Nano Developer Kit Official Original 8GB AI 40Tops For Embedded and Edge Systems Raspberry Pi 4 Sound Card RS485 TO ETH (B) Connect Alibaba Cloud And EMQX Raspberry Pi 7 inch CAPLCD 1280x800 Capacitive TouchScreen HDMI/Type C Display Monitor For Computer mini PC Sipeed-Lichee-Tang-Nano-FPGA-Series-IDE-Install X1002 Raspberry Pi 5 PCIe to M.2 NVMe SSD Adapter Board HAT Pi5 2280 CH340 driver Cortex-A7 ESP32 IR Thermal Imaging Camera 10-Axis DOF ROS IMU (A) Sensor UART ARM 32 DSP Processor BLE 5.3 Bluetooth / Accelerometer / Gyroscope / Magnetometer / Temperature & Pressure 800x480 X1005 Raspberry Pi 5 PCIe to M.2 NVMe Dual SSD Adapter Board HAT Pi5 Double 2230/2242/2260/2280

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

TAG： EyeLink-RC-S1 Industrial Edition FPV Drone ground station image transmission remote control Raspberry Pi 5 PoE HAT Raspberry Pi Pico Camera 1.69inch LCD TouchScreen Display 240×280 ST7789 Arduino Raspberry Pi ESP32S3 Pico STM32 CM5 Cooling Fan 5V 3007 Raspberry Pi Compute Module 5 Raspberry Pi UPS Plus Raspberry Pi 1.3inch LCD Raspberry Pi 5 IR Camera Raspber Pi 5 Arduino IR Thermal Imaging Camera HDMI to RGB Argon GC9107 Core3566004000 2.15 inch e Paper HAT+ B E Ink 296×160 Screen Display Arduino Raspberry Pi Jetson Nano STM32 EC200U EU AU C4-P01 LTE Cat-1 Bluetooth GNSS Raspberry Pi 10.1 inch QLED Quantum Dot Display 1280x720 Capacitive Touchscreen Computer PC Jetson Game ESP32 S3 4inch LCD 480x480 Captive TouchScreen Display LVGL HMI Sensor CAN I2C RS485 TVBOX Development Board FT232RNL USB TO TTL Industrial UART (C) Raspberry Pi 5