Brake lights based on pressure data from CAN bus?

[djhedges]

I have a Razor PDM & Fury ECU talking over CAN bus and controlling things like the fans & fuel pump correctly.  My next goal was to actuate the brake lights with the PDM based on pressure voltages from the ECU.

Wiring currently

• ECU AnVolt 8 - Front brake pressure
• ECU AnVolt 9 - Rear brake pressure
• PDM PWROUT2a - Brake lights

Bonus points for redundancy such that if a brake pressure sensor fails the brake lights still work.

Extra bonus points if we can make the brakes blink.

 

[Laminar]

 

GP analog 1 is front brakes, GP analog 2 is rear brakes, CAN Aux 8 turns on if either pressure is over whatever threshold you set.

You could probably make it flash by using a GP PWM output.

[djhedges]

Thank you, GP output was the missing piece of the puzzle.  Maybe there is a way to play with timers & math to get the lights to blink?

This is what I ended up with which seems to work well.

  

[Vaughan]

To make them flash under higher pressures you could use a gp pwm instead of a gp output with the same conditions and then in the duty cycle table have the pressures on the axes with 100% DC for full on and 50% DC for flash.