Is that pin accessable, even if it means soldering on some sort of auxilliary board?
The funny thing about the QEA, QEB and index pins is they all interchange for AtoD pins. Fortunately for my resolver requirements, I can probably just change out the code; the safetie circuitry Paul designed around them might just work for the resolver...
One option for regen might be a "rocker" gas pedal - it has a centering spring and can move mostly forward like a normal gas pedal, and rock backward or lift for regen. Controls like this were used on some industrial equipment. A neat thing about the RTY sensor I mentioned is the range of sensing angles: +/- 25 degrees to +/- 180 degrees. One sensor on a rocker throttle could work with one +/-25 degree sensor for brake and PART of the regen signal.
I think something like that pressure sensor Astro found would be great in combination with standard hydraulic brakes.
Quote:
Originally Posted by MPaulHolmes
There is one more A/D. How would the brake be a variable signal? I've only heard of pressure switches, but not linear things, so more pressure gives a "more pressure" output. Are there 0-5v brake signal things? We would have to add a little RC filter, and connect to the unused A/D with a wire. Not a big deal.
The dang Index, QEA, QEB are hogging 3 of the A/Ds unfortunately. I had used a 40 pin thru hole dspic30f4011 because the tqfp or whatever they are called chips are hard for most people to solder.
I wonder if it would be mechanically possible for the brake to pull the throttle one way (regen territory), and the gas pedal to push it the other way.
EDIT: OK, I found a brake pressure switch. Basically a throttle. ground, 5v, and 0-5v as a function of PSI.
Brake Pressure Sensor (DSC/ABS/BRAKE Trifecta) - Bimmerfest - BMW Forums |