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： 5inch DDSM115 Direct Drive Servo Motor All-In-One Design Hub RS485 Motor ESP32-C6 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST LVGL For Arduino RV1103 RISC-V Raspberry Pi 4/4.3 inch DSI MIPI LCD TouchScreen Display 4/4.3inch 480x800 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 Raspberry Pi 10.85 inch e-Paper ink screen display black white 1360×480 For Arduino /Jetson /STM32 /ESP32 A7670E LTE Cat-1 HAT for Raspberry Pi Multi Band 2G GSM / GPRS LBS ESP32-S3 IR Infrared Thermal Imaging Camera B 45/90 80×62 ESP32-S3-WROOM 4.2 inch e-Paper Display G Red/Yellow/Black/White 4.2inch E-link Screen For Arduino /Raspberry Pi /Jetson Nano /STM32 HDMI to LVDS LuckFox Pico UNO Minima RA4M1 ZERO Tiny SuperMini R7FA4M1 Board Compatible With R4 For Arduino spotpear Raspberry Pi 5 Raspberry Pi USB Camera 12MP IMX378 30fps onboard dual microphones Also For Jeston / RDK Raspberry Pi IR Thermal Imaging Camera Pi5 Active Cooler Raspberry Pi 5 USB CAN Analyzer

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

TAG： OPS Computer ESP32 Thermal imaging camera Raspberry Pi 6.25 inch DSI Display MIPI LCD Capacitive TouchScreen 720x1560 Raspberry Pi 3 display HAT Raspberry Pi Zero 4G CAT1 LTE USB HUB Air780e Expansion Board Networking Module LTE Ethernet BBC Microbit programmable gamepad for Micro:bit 800x480 PI0 2W ESP32 H2 ESP32-H2-Zero MINI Development Board For BLE/Zigbee/Thread AI Board CSI-to-HDMI ESP32 S3 Development Board 2.41 inch AMOLED Display 600x450 TouchScreen For Arduino LVGL With SD-Port/ QMI8658C 6-Axis Sensor Raspberry Pi Pico 2 RP2350 1.64 inch AMOLED Development Board Display TouchScreen 280x456 QMI8658 IMU QSPI 2.8inch Round LCD USB to UART TOF Time-Of-Flight Laser Range Radar Raspberry Pi Pico 2 1.69 inch LCD Display TouchScreen RP2350 Raspberry Pi Pico 2 RP2350B RP2350-PiZero Development Board PSRAM DVI For HDMI Industrial Isolated Converter 25mm Telephoto CS Lens Raspberry Pi High Quality Camera Global Shutter Camera