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： ESP32-C6 Raspberry Pi 5 D Raspberry Pi Camera DeepSeek XiaoZhi AI Voice Chat Robot BOX ESP32-S3 Development Board 1.85 inch Round LCD N16R8 Raspberry Pi 5 27W ESP32 S3 5 inch LCD Development Board 800x480 TouchScreen Display TVBOX LVGL HMI Sensor CAN RS485 JETSON NANO MINI Raspberry Pi 5 inch LCD 720x1280 Capacitive TouchScreen Display HDMI For Jetson Nano/mini Computer PC Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 SpotPear WiFi Wireless ESP32 DDSM Motor Driver HAT For Direct Drive Servo Hub Motors For Raspberry Pi Raspberry Pi 5 DSI User Guide Jetson Nano Module Raspberry Pi IR Array Thermal Imaging Camera Far infrared 80×62 Pixels 45/90 Degree FOV ESP32-C3 1.47 inch LCD Display Development Board 1.47inch Screen SD 172×320 Raspberry Pi 5 POE + PCIe to M.2 NVMe SSD Board HAT+ Pi5 2242/2230 Power over Ethernet ESP32-P4 ESP32-C6 Development Board RISC-V WiFi6 MIPI CSI Camera 7/10.1 inch DSI Display /RJ45 Ethernet /Mic /Audio Size Compatible with Raspberry Pi Raspberry Pi IR Thermal Imagi ESP32 ST7789 ESP32-S3 Industrial 8-Channel Controller with WiFi Bluetooth CAN IoT RS485 and RJ45 ETH POE

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

TAG： Computer AI Deepseek Mechanical Voice Keyboard Xiaozhi LCD Screen keys Secondary Display ESP32 MLX90640 Industrial UART Converter USB RS232/485 FT232RNL Compact Size Raspberry Pi MLX90640 Raspberry Pi 5 Case Raspberry Pi Camera IMX415 8MP Full-color 95.5° Wide Angle Auto Focus Distortion-free ESP32 Microcontroller Development Board 240MHz ESP32-WROOM/WROVER Raspberry Pi USB Power Splitter DeepSeek AI Voice Chat Robot BOX ESP32-S3 Development Board 3.5 inch QSPI LCD N16R8 Touchscreen Display 6-Axis /Camera /SD Magnetic Encoder Servo Motor 85KG.CM 12V 24V 360&deg; RS485 Raspberry Pi 5 Red-White Case official Active Cooler Luckfox Lyra B RK3506G2 Raspberry Pi 5 Active Cooler CN ADXL354C Evaluation Board ESP32 S3 2.1inch Round LCD Round screen RS232 to Ethernet Raspberry Pi Pico 2 RP2350B Industrial 8-Channel Relay IOT LAN Digital Input DIO /RS485 /RJ45 Ethernet /POE Luckfox Titan RK3576 IMX415 IR-CUT Camera Raspberry Pi 5