SOC Meter, proposed (intended, not "promised") Physical Configuration:
My latest thinking, that I will try to build today (or Sunday), even though I still lack suitable sub-miniature pushbutton switches (n.o., momentary close) to use for the User-Input.
1. A black plastic box, about 4" wide x 2" high x 1.7" deep. The "cover" to the box forms the back face, secured with 4 small hex-head recessed screws, for easy-access to the firmware-update connector.
2. Front Face: A Four-Digit, 7-Segment LED Display, centered in the face.
3. Bottom and Right Side: No holes.
4. Top: Two holes "closer" to the front edge to mount the two User-Input (momentary close) pushbutton switches.
5. The Left Side: A notch in the back edge for the incoming 6-foot, 16-conductor cable from the right-angle OBD connedtor. Two mounting holes for 3-position toggle switches:
a. A single pole for Power "always On", Off, or "Auto-On" (when the car is "Ready").
b. A double pole for "EV-CAN buss" (SOC Mode), "No CAN buss" (Setup Mode), and "Car-CAN buss" (Tire Pressure Mode).
Possibly two small holes low on the side and two small holes high on the side if needed for cooling (I hope not, since it only uses about 1.5 to 2 watts).
Any thoughts or comments before I begin "mass" production (one prototype
)?