Because my ultimate goal is something a bit bigger, and unusually for me, price is not really a factor in this build as I want quality and functionality to be as high as possible as it is going in my classic car which I want to work (ideally) forever!
To give a bit of background, the instrument cluster assembly I'm working on currently looks like this:
And like this with the decal removed (the PCB I'm now working on):
The plan is to house all of the electronics for this unit within the housing, ideally on one board for simplicity, with one I/O connector as small as possible. This will be connected to a fused source from the cars solid state Power Distribution Module (not a physical fuse). So hopefully the signal will be relatively stable before it gets to this unit.
Perhaps the topic for another thread, but I've attached my current Schematic and board designs (there is a separate tiny PCB for the 4th servo as it must sit 7mm offset from the main PCB to get the servo shafts close enough. I was going to ask as my next question if anyone on this forum was able to look it over for me to see if it makes sense. The pinouts between the Teensy and the servo controller I'm happy with and have tested on my breadboard, then the serial connection between the two teensy's will pass information between. One controls the servos alone, the other does the processing and OLED screen and other LED functions. The last bit I think I need to add is the LED backlighting which may be another ring shaped PCB with just LEDs and resistors, plugging into the connector on the main board. Still some more to do but as a first go I think it's looking ok?? Can post eagle files if anyone is interested in helping me check the board