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-S3 LCD ESP32-C3FN4 Pi5 RP2350B-MINI-A picotool Tutorial 2.13 inch Passive NFC e-Paper ink (G) RYBW Display Screen No Need Battery Wireless Power & Data Transfer Wiki Raspberry Pi UGV Rover ROS2 PT AI OpenCV Robot Car MediaPipe D-Robotics RDK X3 MD Carrier Board For RDK X3 Module Horizon Sunrise Pi ARM Cortex-A53 5Tops Raspberry Pi 5 Sound Raspberry Pi spotpear Raspberry Pi AI Camera Official Original 12MP IMX500 Intelligent visual Sensor On-Board RP2040 JETSON NANO B01 ESP32-S3 1.69inch Touchscreen LCD Round Display WiFi Bluetooth With QST Attitude Gyro Sensor QMI8658 Raspberry Pi Raspberry Pi 7 inch DSI MIPI LCD TouchScreen Display 7inch 720x1280 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 X1005 Raspberry Pi 5 PCIe to M.2 NVMe Dual SSD Adapter Board HAT Pi5 Double 2230/2242/2260/2280 Raspberry Pi 5 PCIe to SSD Step Recording and Reproduction Raspberry Pi DSI

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

TAG： UART Speaker Buzzer Luckfox-Pico-Ultra ESP32-S3 Raspberry Pi Display RP2040-PiZero X1004 Raspberry Pi 5 PCIe M.2 NVMe Dual SSD Pi5 Double 2280 4.26inch E-Paper 800x480 Industrial Isolated RS485 TO ETH Raspberry Pi 5 PCIe to M.2 SSD Raspberry Pi M.2 4G 5G LTE HAT GSM GPRS EDGE RM500 SIM8200 GM800 Samsung ARTIK Rock64 Asus Tinker Latte Panda UART TTL To RS485 Raspberry Pi CM5 to Pi 5 Expansion Board With USB microphone &amp;amp; Audio Port Spotpear D-Robotics RDK X3 MD Carrier Board ESP32 S3 Board Desktop Ornament Active Cooler ESP32-S3 GEEK Sipeed RISCV LicheeRV Nano Super-Mini Open PicoClaw SG2002 AI RAM-256MB ESP32-S3 1.28inch