ACEBOTT HC-SR04 Ultrasonic Sensor

The ultrasonic sensor is a multi-functional tool to measure distance and is commonly used in vehicle obstacle avoidance systems and related projects. It works as follows: an ultrasonic transmitter emits ultrasonic waves in a specific direction while a timer starts ticking. These waves travel through the air and bounce back when they meet an obstacle.

What It Is

A compact ultrasonic distance sensor that uses sound waves to measure how far an object is without any physical contact. It's widely used in robotics, obstacle avoidance, parking sensors, DIY gadgets, and automation systems.

Key Features Infographic Points

1. Ultrasonic Distance Measurement

• Measures distance using ultrasonic sound waves (sound too high for humans to hear).

• Sto return distance is calculated from that.

2. Wide Sensing Range

• Detects objects between ~2 cm to 400 cm (4 m) suitable for many beginner and intermediate projects.

• Range resolution is precise with typical 3 mm accuracy.

3. Simple 4-Pin Interface

• VCC: Power (5 V supply).

• GND: Ground.

• Trig: Trigger signal pin (starts the measurement).

• Echo: Echo signal pin (reports measured distance). This makes it easy to connect to boards like Arduino, ESP32, ESP8266, Raspberry Pi, etc.

4. Fast & Reliable Response

• Emits 40 kHz ultrasonic pulses and updates distance quickly (of robot navigation and automation tasks.

5. Non-Contact Detection

• Measures distance without touching the object, so it can detect fragile or moving targets safely.

• Works well on flat surfaces; but irregular or soft materials (like fabric) can reflect less effectively.

6. Wide Compatibility

• Works with microcontrollers and platforms like Arduino, ESP32, ESP8266, Raspberry Pi, and many DIY robotics kits.

• Great for beginners and advanced users alike.

How It Works (Quick Visual Logic)

• Trigger (TRIG) MCU sends a 10 s pulse.

• Emit Sound Pulse Sensor transmits ultrasonic wave.

• Echo Return Sound bounces back from object.

• Distance = (Time Speed of Sound) / 2

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Typical Uses & Applications

Obstacle avoidance in robotic cars Parking / distance alert systems Level sensing (e.g., water tanks) Proximity detection for automation DIY smart home & embedded projects

Pro Tips for Best Results

Place the sensor perpendicular to the target for accurate readings. Avoid placing it near soft or angled surfaces sound may scatter. Provide a stable 5 V supply for consistent output.

What's in the Module

Compact PCB with:

• Ultrasonic transmitter

Why It's Useful for Beginners

Easy to interface even with simple microcontrollers. Helps you learn sensor interfacing, timing, and control logic. Works great in robotics and a