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： ST servo driver RP2040 Power Manager Module ESP32-C3FN4 Raspberry Pi 18.5inch FHD LCD 1920x1080 Capacitive TouchScreen Display For Raspberry Pi/Jetson Nano/ Raspberry Pi Pico 1.14inch LCD Raspberry Pi LuckFox Pico Camera Arduino Board Managers Tutorial User Guide Raspberry Pi Pico 2 W RP2350 Pico2W ARM Cortex-M33 And RISC-V Hazard3 Wi-Fi4 Bluetooth5.2 CYW43439 USB IR Infrared Thermal Imaging Camera C 45°/88° 160x120 For Phone/PC High Temp Warning/Take Photo /Recording video Raspberry Pi 5 Camera User Guide Raspberry Pi 5 PD Activation Raspberry pi Pico development board RP2040 Core A Based On Official RP2040 Dual Core Processor DeepsSeek XiaoZhi AI Voice Chat ESP32-S3 1.54 inch LCD Kit N16R8 WROOM-1-N16R8 DevKitC-1 Development Board RS485 to Ethernet Raspberry Pi 5 PD Activation Module Raspberry Pi Raspberry Pi 5 PCIe TO Gigabit RJ45 ETH Adapter Board (C) Driver-Free RTL8111H For Pi5 Jetson

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

TAG： ESP32-S3 RV1103 SC3336 7.5 inch Passive NFC e-Paper BW Display E-ink Screen No Need Battery Wireless Powered 1.54 inch Passive NFC e-Paper BW Display E-ink Screen No Need Battery Wireless Powered Raspberry Pi 5 4.2 inch e-Paper G Raspberry Pi Capacitive Touchscreen mobile phone Raspberry Pi Pico 2 RP2350 LCD 0.96 inch Displayscreen RP2350A USB TO TTL FT232 UART Mini Communication Converter FT232RNL Raspberry Pi Raspberry Pi LCD Luckfox Pico Ultra B RV1106G2 Raspberry Pi UGV Rover PT AI 4G 5G OpenCV Robot Car MediaPipe Jetson Orin Nano SpotPear ESP32 spotpear SpotPear RDK X5 PoE