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 5 Raspberry Pi Pico 2 RP2350 GEEK 1.14 inch LCD 240x135 65K SWD/UART/I2C For OpenOCD/CMSIS-DAP Raspberry Pi 5 Night Camera Arduino MLX90640 Luckfox Pico Zero RV1106G3 SD WiFi6 Audio eMMC-8G RAM-256MB RS232 to RJ45 Jetson Nano Cooler Spotpear UGV Rover ROS2 PT AI OpenCV Robot Car MediaPipe For Jetson Orin Nano Raspberry Pi Pico 2 RP2350-Matrix Development Board 8×8 RGB LED Matrix QMI8658 6-Axis Sensor ESP32 MLX90641 IMX477 IR CUT Camera (A) 12.3MP For Jetson Nano/Orin And Raspberry Pi 8inch LCD 1280x800 Computer PC Monitor Display Secondary Screen TypeC USB CPU RAM Sipeed NanoCluster Mini Cluster Board mini data center For Raspberry Pi CM45 / Computer /LM3H /M4N Milk-V Duo Tutorial USB TO RS485 Rasperry Pico 2 RP2350 7.3 inch e-Paper Ink Display E6 Full Color Electronic PhotoPainter 800x480 For Calendar/Quotes/Paintings/Posters TVOC Sensor gas Sensor Expansion board UART High Sensitivity For Arduino /Raspberry Pi /Pico /ESP32 Gyroscope Raspberry Pi 5 8 inch DSI LCD Captive TouchScreen MIPI Display 1280x800 Industrial One-Body Tablet PC With 5MP Front Camera

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

TAG： Serial Server Raspberry Pi 5 IMX219 Raspberry Pi 5 PCIe to 4-CH PCIe FFC HAT Board Pi5 4 Channels USB to UART Raspberry Pi 5 PD Induction Raspberry Pi 10.1 inch QLED Quantum Dot Display 1280x720 Capacitive Touchscreen Computer PC Jetson Game D-Robotics RDK S100 Robot Development Kit Horizon Sunrise 80TOPS BPU 4 &times; USB3.0 Type-A RS232 to RS422 Raspberry Pi Pico Knob screen Raspberry Pi 21.5inch FHD LCD 1080x1920 Capacitive TouchScreen Display Raspberry Pi 4B ABS black shell Case For Official Original 7 inch 800x480 display Touch Screen Raspberry Pi 5 POE Power over Ethernet PCIe to M.2 NVMe SSD Board HAT+ ESP32 P4 Development Board WIFI6 4 inch LCD Round Display 4inch TouchScreen 720×720 Dual Microphones Raspberry Pi 5 LIR2032 LuckFox Pico UART Industrial Isolated 4CH RS485 TO POE ETH (B) RJ45 Converter UART For Modbus Intel Wireless WLAN BE200 WiFi7 Bluetooth 5.4 Jetson Nano ESP32-C3FN4