This outlines design changes to the newest version of PD that will be identical in the rear and front enclosure.
Additions/mods
Change barrier term to power term
Add GPIO out for Horn Low side FET control
Change silk to match for front/rear
Add fan control for DCDC and rear enclosure fans
add power rail (maybe) for fan on center console
make sure we have spare outputs
Add ADT7476A to both power and get all fan tachometer readings
Pin identification with LED indication for front/rear (also updated silk)
shorted pin or FW feedback for which board is which (similar to solar sense)
Update to all microfits kinked pins
have thermistor/pot input for rear/front for similar input resistance for fan control (talk to Adrian Au about placement)
Rear power has 3 fans (use ADT7476A) and 1 fan for DCDC (same IC)
Raspberry pi will read from SoC temp sense and control PWM to noctua fan → fan will be powered through center console
how many fans should front power control for ventilation? Adrian Au
4 fans - 2 on driver side and 2 on passenger side ← both have different speed control
volume like switch where you turn past a point to turn on then have intensity control
use rotary pot with spst switch such as following: P162G100QRC30B103
Josh Rong add other changes you have noted from before here
Add thermal relief to component connected to the large polygon pour to help with soldering.
Make sure to calculate the energy stored in the horn’s inductor and that the Load Switches can handle it - add a flyback diode if not.
need a 5V out for all the cameras
Switch I2C pins on IOExpander