How to Connect an Industrial Laser Distance Sensor to Raspberry Pi Using Python

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A new tutorial on DEV Community walks developers through interfacing an industrial phase-shift laser distance sensor with a Raspberry Pi using Python. The guide focuses on the LDL-T series optical module, which offers millimeter-level accuracy over ranges up to 100 meters — far beyond what common ultrasonic or infrared sensors can reliably achieve. It covers hardware wiring, enabling the Pi's serial UART port, and installing the pyserial library to handle communication. The sensor communicates via HEX frame commands over serial, and the provided Python script triggers single-shot measurements, validates checksums, and converts the 4-byte response into a distance reading in meters. The tutorial also includes troubleshooting advice for common issues such as serial port permission errors and wiring mistakes.

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