BRAKELIGHT

BOARD 05 // LIGHTING // TRIANGULAR // 36 LEDS

FUNCTION

The red triangular board at the back of the car. It lights when the brake signal arrives from the BSPD: the BSPD's window comparator pulls Brake_Light_Drain low whenever the brake pressure sensor reads a valid press, and this board's LED matrix completes to that drain. All decision-making lives on the BSPD; this board is just the LED matrix, a PTC fuse, and copper.

ARCHITECTURE

36 red LEDs (1200 mcd) arranged in six parallel strings of six, fed from 12V through a resettable PTC fuse and drained through the BSPD's low-side switch. The triangular outline packs the strings to match the mandated rear-facing geometry, with three M3 mounts at the corners.

SCHEMATICS

brakelight schematic layout plot — LAYOUT PLOT

REV NOTES

All logic stays upstream on the BSPD; the board itself is LEDs, a resettable fuse, and copper sized for the string current. It mounts where the car sees the most vibration and weather, so the simplest possible board is the right one.