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： RS232 to RS485 Arducam 64MP Camera Raspberry Pi 5 NVMe IPS ESP32-P4 PICO Development Board with MIPI DSI 10.1-inch Display X1002 Raspberry Pi 5 PCIe to M.2 NVMe SSD Adapter Board HAT Pi5 2280 Intel 12th ESP32-S3 EchoEar ESP32 S3 AI Development Board with 1.85-inch LCD Display Cute Cat Pet Chatting Robot N32R16 RM520N GL 5G/4G/3G M.2 Moudle IoT EMBB For LTE-A/NSA/SA And GNSS For DFOTA /VoLTE For Quectel Raspberry Pi 3 LCD HAT Pi5-Pcie-Fish-Boar ESP32 Arduino Board Managers Tutorial User Guide USB TO TTL Mini FT232 UART Communication Converter Original FT232RNL user guide ESP32-S3 AI Voice Images Chat Robot Electronic PhotoPainter Frame E-Paper Ink Screen 7.3-inch E6 Full-Color Deepseek Development Board Electronic EYE 0.71 inch Round LCD Display Screen For Arduino Raspberry Pi ESP32 Pico STM32 Raspberry Pi 64MP Camera Metal Case

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

TAG： Raspberry Pi UPS Plus Raspberry Pi A7670E LTE Cat-1 2G GSM GPRS LBS WIFI-Kit-32 Raspberry Pi 13.3 inch FHD AMOLED Capacitive TouchScreen Display Type-C HDMI Computer PC Raspberry Pi 0.96inch RGB OLED 1.83inch LCD TouchScreen Display 240×280 NV3030B Arduino Raspberry Pi ESP32S3 Pico STM32 Milk-V Duo 256 Raspberry Pi HQ High Quality Camera 12.3MP IMX477 Sensor C CS Lenses Jetson Nano Cooler Bluetooth/WiFi ESP32-S3 AI 1.54-inch e-Paper Ink Screen 1.54inch Display AIoT Development Board Deepseek Grove Base IO HAT SeeedStudio-XIAO Battery Management PC Monitor Screen Raspberry Pi 5 Speaker MG90S Servo Micro Metal Gear High Torque 2kg 2.8kg Rotate 180Angle Raspberry Pi 5 Power DeepSeek AI Voice Chat ESP32 C6 Development Board 1.69 inch LCD Display 240x280 1.69inch TouchScreen Programmable Watch Sipeed SLogic USB Logic Analyzer 80M DAPLink CKLink Debugger Tool UART Module ESP32 Industrial CAN FD ETH/RS232/RS485 bidirectional converter CAN2.0A/B