The KS103 Ultrasonic Distance Sensor Module is a professional-grade ranging sensor designed for applications that demand the highest levels of accuracy, speed, and reliability. Unlike basic ultrasonic modules, the KS103 integrates real-time temperature compensation and a fast temperature detection function, making it exceptionally well-suited for robotics, computer vision, and outdoor environments where temperature fluctuations would otherwise degrade measurement precision .
At the heart of the module is an ultrasonic transmitter and receiver pair operating at 40kHz, paired with a dedicated temperature sensor and a powerful onboard processing unit. The KS103 is capable of real-time temperature-compensated distance measurement, achieving a resolution of 1mm and a measurement accuracy of 0.152mm at 17cm in ideal conditions . The detection range spans from 1cm to 800cm (with a 10m option available), and the module supports detection frequencies up to 500Hz, meaning it can perform over 500 measurements per second .
The module offers dual communication interfaces: I²C and TTL serial (selectable via the MODE pin) . In I²C mode (default, MODE pin floating), the module operates as a slave device with a default address of 0xE8 (8-bit), which can be changed to one of 20 selectable addresses (0xD0–0xFE, excluding 0xF0–0xF6) . This allows up to 20 KS103 modules to be connected on the same I²C bus, making it ideal for multi-sensor robotic platforms and distributed obstacle avoidance systems . The I²C communication speed supports 50–100 kbit/s .
The KS103’s standout feature is its integrated temperature compensation. The module can measure ambient temperature in just 83ms with 0.0625°C accuracy . For distance measurement, it offers multiple commands, including 0xB4 (temperature-compensated ranging with the highest precision) and 0xBC (temperature-compensated ranging for up to 11m) . Alternatively, users can combine the transmission time command (0xB2/0xBA) with the temperature reading (0xC9/0xCA/0xCB/0xCC) and apply their own speed-of-sound formula for absolute precision .
The module also includes unique filtering noise reduction technology, allowing it to work reliably even with noisy power supplies (such as when powered from a computer’s USB port) . It features nanoWatt-level power saving, automatically entering a microamp-level sleep mode after 5 seconds without commands, and can be woken up instantly by any I²C command . The operating voltage range is a wide 3.0V to 5.5V (5V recommended for best range), with a working current of 1.6–2.7mA typical and a peak current of 10.6mA . The module operates across an industrial temperature range of -30°C to +85°C .
The compact 5-pin interface (VCC, SDA/TX, SCL/RX, GND, MODE) and standard 2.54mm pin header make it easy to integrate into custom PCBs and robotic platforms . A practical example of its use is in distributed ultrasonic obstacle avoidance systems, where multiple KS103 modules are connected on a single I²C bus for a self-driving food delivery cart . It is also used in smart car navigation, where three KS103S modules on one bus measure front, left, and right distances .
Important Note: The module is not waterproof and should not be submerged. The minimum detection distance is 1cm, and for best results, use a 5V power supply — lower voltages will reduce the effective range . The VCC and GND must not be reversed, as this can permanently damage the module . When modifying the I²C address, do not cut power during the process, or the EEPROM may be corrupted . For distances under 10cm, ensure a delay of more than 1ms between measurements to avoid residual echoes .
Whether you are building a high-precision robotic navigation system, a multi-sensor computer vision platform, or an outdoor distance measurement device, the KS103 Ultrasonic Sensor Module provides a professional-grade solution. It is suitable for individual engineers, robotics researchers, and businesses purchasing in bulk for product development or industrial applications.
Features
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Real-time temperature compensation — Automatically corrects distance measurements for ambient temperature variations
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High precision — 1mm resolution with 0.152mm error at 17cm in ideal conditions
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Fast temperature detection — 83ms measurement time with 0.0625°C accuracy
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High detection frequency — Up to 500Hz (500 measurements per second)
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Dual communication interfaces — I²C (default) and TTL serial, selectable via MODE pin
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20 selectable I²C addresses — Up to 20 modules on one bus for multi-sensor applications
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Wide detection range — 1cm to 800cm (10m option available)
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Noise reduction technology — Works reliably even with noisy power supplies
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Ultra-low power consumption — 1.6–2.7mA typical, microamp-level sleep mode after 5s
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Wide operating voltage — 3.0V to 5.5V (5V recommended for best range)
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Module Model | KS103 |
| 2 | Operating Voltage | 3.0V – 5.5V DC (5V recommended) |
| 3 | Operating Current | 1.6 – 2.7mA typical; 10.6mA peak |
| 4 | Detection Range | 1cm – 800cm (up to 1000cm option) |
| 5 | Resolution | 1mm |
| 6 | Accuracy | 0.152mm at 17cm (with temperature compensation) |
| 7 | Interface | I²C (default, 50–100 kbit/s) or TTL serial |
| 8 | I²C Address | Default 0xE8 (8-bit); 20 selectable addresses |
