Pathfinder 8-Way (Line8) × MINDSTORMS EV3

Using the Pathfinder 8-Way (Line8) with MINDSTORMS EV3: check the edition and the wiring, then pick your software; its page covers that software only.

Which edition

Get the EV3 edition (RJ12 plug) and plug it into sensor port 1~4. Power the EV3 on first, then plug the sensor in, pushing the plug all the way in, in one go; replug if the numbers freeze or the EV3 detects the wrong device.

Tip

Tested on the EV3 (2026-11-03): the stock EV3 firmware (EV3-G / EV3 Classroom / clev3r) and Pybricks v4 pass; ev3dev / EV3 MicroPython v2 are supported (same mode table as the LEGO infrared sensor). The EV3 detects it as an infrared sensor (type 33).

• Switching sensor modes on the EV3 takes about 1.1 s (the same for the LEGO infrared sensor): read one mode only and do not switch modes inside a loop.
• With no line in view, mode 0 stays at the side where the line was last seen (±8), not 0.
• The EV3 edition cannot take commands from the hub (stock firmware, Pybricks and ev3dev cannot send E0~E9; the format is exactly the same as the LEGO infrared sensor). Instead: hold the board button while powering up = white-line mode (not pressed = black line); press the calibration button while running = 5-second dynamic calibration. Left/right swap and thresholds are not available on the EV3 edition; use the SPIKE or I2C edition for those.

Wiring

② Pick your software

EV3-GCommon in school labs and WRO teamsEV3 ClassroomSame blocks as SPIKE; easy for first-time EV3 usersPybricksPython code with access to every modeclev3rBASIC text code for existing clev3r users

More

• Pathfinder 8-Way (Line8): overview, specs and calibration
• Download centre