HC-SR04 Ultrasonic Sensor Module

The HC-SR04 Ultrasonic Distance Sensor uses sound waves to measure the distance between the module and a nearby object. Therefore, it provides a practical solution for robots, obstacle detection, level monitoring, and automation projects. The module includes an ultrasonic transmitter, receiver, and control circuit. Moreover, its four-pin interface makes it easy to connect to Arduino and other development boards. Key Features Measures distance without physical contact Offers a measurement range from 2cm to 400cm Provides accuracy up to 3mm under suitable conditions Uses 40kHz ultrasonic signals Includes separate Trigger and Echo pins Works with Arduino and many microcontrollers Offers fast and repeatable distance readings Requires only one digital input and one digital output Compact and lightweight design Technical Specifications Model: HC-SR04 Sensor Type: Ultrasonic Distance Sensor Operating Voltage: 5V DC Operating Current: Approximately 15mA Measurement Range: 2–400cm Ranging Accuracy: Up to 3mm Ultrasonic Frequency: 40kHz Detection Angle: Approximately 15° Trigger Signal: HIGH pulse of at least 10µs Output Signal: TTL Echo pulse Dimensions: Approximately 45 × 20 × 15mm Pin Configuration VCC: Connect to a regulated 5V supply TRIG: Receives the measurement trigger pulse ECHO: Outputs a pulse proportional to the measured distance GND: Connects to the circuit ground How It Works First, the controller sends a HIGH pulse of at least 10µs to the TRIG pin. The module then transmits eight ultrasonic pulses at 40kHz. Next, the receiver waits for the reflected sound. The ECHO pin remains HIGH for the time required by the sound to travel to the object and return. Calculate the distance with this formula: Distance = Echo Time × Speed of Sound ÷ 2 For a simple centimetre calculation at room temperature: Distance in cm ≈ Echo Time in µs ÷ 58 Applications The HC-SR04 suits many electronics projects, including: Robot obstacle detection Distance-measuring devices Automatic parking prototypes Tank and container level monitoring Security and proximity systems Smart bins and automatic doors Arduino and STEM projects Industrial automation prototypes Important Notes Power the standard HC-SR04 module with 5V. The ECHO pin can output 5V logic. Use a voltage divider or level shifter with 3.3V controllers. Connect all devices to a common ground. Soft, narrow, curved, or angled objects may reduce measurement reliability. Temperature and air conditions can affect the speed of sound. This standard module is not waterproof. Allow enough time between measurements to prevent false echoes. Package Includes 1× HC-SR04 Ultrasonic Distance Sensor Module

HC-SR04 Ultrasonic Sensor Detector 3.3V-5V The HC-SR04 Ultrasonic Sensor Detector 3.3V-5V is a highly reliable and widely used distance measuring module ideal for robotics, automation, and obstacle detection projects. Operating within a voltage range of 3.3V to 5V, it offers excellent compatibility with microcontrollers such as Arduino, Raspberry Pi, and other development boards. Using ultrasonic waves, it can accurately detect objects and measure distances typically ranging from 2 cm up to 400 cm, with a precision of about 3 mm. The module features a transmitter and receiver pair that sends and detects ultrasonic pulses, calculating the time delay to determine the distance to an object. Compact, lightweight, and easy to integrate, the HC-SR04 is a cost-effective solution for applications such as smart robots, distance monitoring, automatic parking systems, and object avoidance technologies. Features Wide Operating Voltage Works with both 3.3V and 5V, compatible with Arduino, Raspberry Pi, and other controllers. Long Range Detection Measures distances from 2 cm up to 400 cm (4 meters). High Accuracy Offers a measurement accuracy of approximately ±3 mm. Simple Interface Uses standard Trigger and Echo pins for easy integration. Compact Design Lightweight and small, ideal for robotics and embedded systems. Low Power Consumption Efficient operation suitable for battery-powered projects. Versatile Applications Perfect for obstacle avoidance, distance measurement, object detection, and automation systems. Specifications Specification Details Operating Voltage 3.3V – 5V Operating Current 15 mA Operating Frequency 40 kHz Measuring Range 2 cm – 400 cm Accuracy / Resolution ±3 mm Trigger Input Signal 10 µs TTL pulse Echo Output Signal TTL pulse, proportional to distance Measuring Angle < 15° Sensor Dimensions 45mm X 20mm X 15mm Effective Output Pulse width corresponds to distance Communication Interface Trigger (input) & Echo (output) pins Compatibility Arduino, Raspberry Pi, Microcontrollers Pinout Pin Number Pin Name Description 1 Vcc The Vcc pin powers the sensor, DC3.3-5V 2 Trigger Trigger pin is an Input pin. This pin has to be kept high for 10us to initialize measurement by sending US wave. 3 Echo Echo pin is an Output pin. This pin goes high for a period of time which will be equal to the time taken for the US wave to return back to the sensor. 4 Ground This pin is connected to the Ground of the system. Interfaces for HC-SR04 Ultrasonic Sensor Interface M1 M2 GPIO (General Purpose I/O) NC NC I2C (Inter-Integrated Circuit) NC R8 UART (Universal Asynchronous Receiver-Transmitter) R7 NC 1-WIRE R7 R8 Interface Usage Connection Description GPIO (General Purpose I/O) Digital signal output for distance measurement. Connect Trigger Pin to a digital output pin and Echo Pin to a digital input pin of the microcontroller. Used for triggering the sensor and reading the echo for distance calculation. I2C (Inter-Integrated Circuit) Allows communication with multiple devices over two wires (SDA and SCL). Connect SDA and SCL to the respective pins on your microcontroller with pull-up resistors (typically 4.7kΩ). Enables communication with multiple devices on the same bus using just two wires. UART (Universal Asynchronous Receiver-Transmitter) Serial communication for sending and receiving data. Connect TX to RX and RX to TX of the microcontroller (with voltage level shifting if necessary). Used for serial communication to transmit or receive data to/from the sensor. 1-WIRE A single-wire interface for multiple device communication. Connect the data line to the Trigger Pin with a pull-up resistor (typically 4.7kΩ) to the supply voltage. Allows communication between multiple devices over a single wire. Wiring and Resistor Configuration Interface Resistor Configuration Description GPIO (General Purpose I/O) Echo Pin: 1kΩ resistor in series with the Echo Pin (if interfacing with a 3.3V system). Ensures safe voltage level for the microcontroller (e.g., Arduino with 5V logic). I2C (Inter-Integrated Circuit) SDA/SCL Lines: 4.7kΩ pull-up resistors on both the SDA and SCL lines. Required for proper I2C communication to ensure signal integrity. UART (Universal Asynchronous Receiver-Transmitter) TX/RX Lines: Level shifting may be required if interfacing with a 3.3V system. Use a voltage divider (typically 1kΩ and 2kΩ resistors). Ensures the voltage levels between the HC-SR04 and microcontroller are compatible (for UART communication). 1-WIRE Interface Data Line: 4.7kΩ pull-up resistor between data line and supply voltage. Required to ensure reliable communication over the 1-WIRE data line. Functionality of HC-SR04 Ultrasonic Sensor Distance Measurement : The HC-SR04 sensor uses ultrasonic sound waves to measure the distance to an object. The sensor emits a pulse via the Trigger Pin . The pulse travels, hits an object, and returns to the sensor, which detects it through the Echo Pin . The time taken for the echo to return is proportional to the distance. Drawing Applications Robotics & Drones. Smart Vehicles. Industrial Automation. Security Systems. IoT Projects. Educational Kits. DIY Electronics. Package Contents 1 x HC-SR04 Ultrasonic Sensor Detector 3.3V-5V

HC-SR04 Ultrasonic Range Finder Sensor This HC-SR04-Ultrasonic Range Finder is a very popular sensor which is found in many applications where it requires to measure distance and detect the objects. The module has two eyes like projects in the front which forms the Ultrasonic transmitter and Receiver. The HC-SR04 ultrasonic sensor uses sonar to determine the distance to an object like bats or dolphins do. This Ultrasonic Sensor module is a transmitter, a receiver and a control circuit in one single pack!! It has very handy and compact construction. It offers excellent range accuracy and stable readings in an easy-to-use package. Its operation is not affected by sunlight or black material like Sharp rangefinders are (although acoustically soft materials like cloth can be difficult to detect). The Trigger and the Echo pins are the I/O pins of this module and hence they can be connected to the I/O pins of the microcontroller/Arduino. When the receiver detects return wave the Echo pin goes high for a particular amount of time which will be equal to the time taken for the wave to return back to the sensor. Ultrasonic Ranging Module HC-SR04 provides 2cm-400cm non-contact distance sensing capabilities, Ranging accuracy up to 3mm. This Ultrasonic Sensor can be attached to your project using mounting bracket, so buy it now at Robu.in we have a very good quality Acrylic Mounting Bracket for this HC-SR04 Ultrasonic Module. Wiring 5V ( positive ) Trig ( control ) Echo ( receive ) GND ( negative ) Features : Measures the distance within a wide range of 2cm to 400cm Stable performance Accurate distance measurement High-density Small blind distance Package Includes: 1 x HC-SR04-Ultrasonic Range Finder Model HC-SR04 Operating Voltage (VDC) 5 Average Current Consumption (mA) 2 Frequency(Hz) 40000 Sensing Angle 15° Max. Sensing Distance (cm) 450 Weight (gm) 9 Sensor Cover Dia. (mm) 16 PCB Size ( L x W ) mm 45 x 20 Shipment Weight 0.09 kg Shipment Dimensions 5 × 4 × 3 cm حساس قياس المسافة بالموجات فوق الصوتية HC-SR04 يُعد هذا الحساس HC-SR04 لقياس المسافة بالموجات فوق الصوتية من أشهر الحساسات المستخدمة في كثير من التطبيقات التي تتطلب قياس المسافة و اكتشاف الأجسام . تحتوي الوحدة في مقدمتها على جزأين يشبهان العينين، وهما يمثلان مرسل و مستقبل الموجات فوق الصوتية. يستخدم حساس HC-SR04 تقنية السونار لتحديد المسافة إلى الجسم، بنفس الفكرة التي تستخدمها الخفافيش و الدلافين . تجمع هذه الوحدة في حزمة واحدة كلًا من المرسل و المستقبل و دائرة التحكم ، كما أنها تتميز بتصميم عملي ومضغوط. توفر الحساس دقة جيدة في قياس المسافة و قراءات ثابتة ضمن وحدة سهلة الاستخدام. ولا يتأثر أداؤه بأشعة الشمس أو بالأسطح السوداء كما يحدث مع بعض حساسات المسافة الأخرى، مع العلم أن المواد اللينة صوتيًا مثل القماش قد تكون أصعب في الاكتشاف. يُعتبر طرفا Trigger و Echo هما أطراف الإدخال والإخراج الخاصة بهذه الوحدة، ولذلك يمكن توصيلهما مباشرة بأطراف الإدخال والإخراج في المتحكمات الدقيقة أو لوحات أردوينو . وعندما يكتشف المستقبل الموجة المرتدة، فإن طرف Echo يتحول إلى حالة مرتفعة لمدة زمنية معينة، وتكون هذه المدة مساوية للوقت الذي استغرقته الموجة للعودة إلى الحساس. توفر وحدة القياس بالموجات فوق الصوتية HC-SR04 إمكانية قياس المسافات بدون تلامس من 2 سم إلى 400 سم ، مع دقة قياس تصل إلى 3 مم . يمكن تثبيت هذا الحساس في مشروعك باستخدام حامل تثبيت مناسب، لذلك فهو خيار ممتاز للمشروعات التعليمية والروبوتات وأنظمة تجنب العوائق. التوصيلات: 5V : موجب التغذية Trig : طرف التحكم Echo : طرف الاستقبال GND : السالب المميزات: قياس المسافة ضمن مدى واسع من 2 سم إلى 400 سم أداء ثابت قياس دقيق للمسافة تصميم عالي الكثافة مسافة عمياء صغيرة محتويات العبوة: 1 × حساس قياس المسافة بالموجات فوق الصوتية HC-SR04 المواصفات: الموديل: HC-SR04 جهد التشغيل: 5 فولت تيار مستمر متوسط استهلاك التيار: 2 ملي أمبير التردد: 40000 هرتز زاوية الاستشعار: 15 درجة أقصى مسافة استشعار: 450 سم الوزن: 9 جم قطر غطاء الحساس: 16 مم مقاس لوحة الدائرة: 45 × 20 مم وزن الشحن: 0.09 كجم أبعاد الشحن: 5 × 4 × 3 سم

Distance Measurement Sensor Module

HC-SR04 Ultrasonic Sensor Module