Sensor | 7.5m Long Range | Liquid Level & Distance Measurement

This long-range ultrasonic sensor module measures distances up to 7.5 meters (750cm). Its longer range and waterproof probe make it a good choice for outdoor projects or sensing liquid levels. It's a capable step up from a standard HC-SR04 for more demanding uses. Features and Benefits - Measures distances up to 7.5 meters - This works well for watching larger areas or finding objects farther away. - Waterproof, sealed ultrasonic sensor head - You can reliably measure liquid levels in water tanks, sumps, or wells. - Works with 3.3V and 5V logic - It connects directly to Arduino, Raspberry Pi, and other microcontrollers without needing a logic level shifter. - Has onboard temperature compensation - This gives more stable and accurate distance readings by adjusting for air temperature changes. Applications - Checking water, fuel, or chemical levels in large tanks. - Long-range object detection for security systems or vehicle detection in a driveway. - Industrial automation for measuring material height in bins and hoppers. How It Works An ultrasonic sensor operates by emitting high-frequency sound waves, typically above 20 kHz, which are inaudible to humans. This particular sensor uses ultrasonic sound to determine both liquid levels and distances. The piezoelectric transducer within the sensor generates these sound waves, often at 40 kHz, which then travel through the air. When these sound waves encounter an object or liquid surface, they reflect back to the sensor. The sensor then measures the time it takes for the sound wave to return, allowing for precise calculations of distance. The Formula The fundamental principle behind an ultrasonic sensor's operation relies on the speed of sound. To calculate distance, the sensor measures the "time of flight" (TOF) of the sound wave – the duration from emission to reception. The formula used is: Distance = (Speed of Sound × Time of Flight) / 2. The division by two accounts for the sound wave travelling to the object and then back again. This sensor has a measurement range of 2cm to 750cm, indicating its capability for both close-range and longer-range applications. Key Components The core of this ultrasonic sensor is its piezoelectric transducer, which acts as both a speaker and a microphone, emitting and receiving the 40 kHz sound waves. As a semi-finished product, it is designed for integration into larger systems. It requires an external power source, as a battery is not included. The sensor is compatible with popular development platforms like Arduino and Raspberry Pi, making it suitable for a variety of DIY and professional projects. Common Applications This 7.5m long range ultrasonic sensor is primarily designed for distance measurement and liquid level monitoring. Its ability to measure up to 750cm makes it suitable for tasks such as monitoring the fill level of water tanks, fuel containers, or other liquid storage systems. It can also be used in robotics for obstacle detection or in automation for position sensing. Its compatibility with Arduino and Raspberry Pi allows for flexible integration into custom control systems. Advantages & Limitations A key advantage of this ultrasonic sensor is its non-contact measurement capability, meaning it does not need to touch the liquid or object it is measuring, reducing wear and contamination risks. It offers a broad measurement range of 2cm to 750cm, making it versatile. However, as a semi-finished product, it requires integration into a larger circuit or system, and a battery is not included. Its performance can be affected by factors such as extreme temperature changes, humidity, and the presence of soft, sound-absorbing materials.