A multi-client web platform for telemetry of the mechanical properties of material

This paper presents a multi-client web platform for telemetry of mechanical property testing, built around an existing tensile testing machine as an approach to its modernization. Extension and force measurements are performed using potentiometers with analog outputs connected to a 24-bit analog-to-digital converter (ADS1256) integrated with a Raspberry Pi 5 microcomputer. The communication module enables data acquisition and timing, the organization of a wireless Wi-Fi network, the operation of web and DNS servers, and full-duplex information exchange via the WebSocket protocol. A specially developed web application with a graphical user interface allows researchers to observe the "force-extension" curve and numerical values in real time on personal digital devices without installing specialized software. The platform supports simultaneous multi-client access, which increases the accessibility and convenience of experimental research. Validation experiments on reinforcing steel confirmed stable platform performance at a data acquisition frequency of 15 Hz with up to 15 simultaneous client connections. The measurement accuracy was within ± 1 % for both force and extension, meeting ISO 6892-1 requirements. The proposed solution provides an affordable and flexible tool for scientific and educational purposes, enhancing the informativeness and accuracy of experimental tests while offering a practical pathway for upgrading conventional tensile testing machines.