Official Freematics Hardware
External I/O Cable
$8.00
Freematics ONE+ has an external I/O socket. The 4-pin socket contains 2x I/O pins (ESP32's GPIO26 and GPIO34), VCC (controllable by ESP32's GPIO12) and GND, as following.
With a Molex to 2.54 Dupont connector conversion cable, external sensors or controller can be easily connected. On the Dupont connector side, black for GND, red for VCC, white for GPIO34 and green for GPIO26.
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Technical confidence before purchase
Add product metafields for specifications, compatibility, firmware, downloads and what is included. This section is intentionally technical to suit Freematics buyers.
Best for: vehicle telemetry, diagnostics and data logging.
Compatibility: update per product model.
Documentation: link manuals, GitHub repositories and firmware downloads.