ETB Driver Socket and Case

[chadjmccolm]

Context

The socket for the ETB driver is missing the required ground pins. Without those pins, the ETB driver will
not run (as the ground on the logic side jumps to 3V and it needs 3.3V minimum between ground and
power (5V)) to manage the power to the motor.

The current solution is to remove the ETB driver from the case and jump the grounds directly to ground.
This is not a permanent solution. The shield that attaches to the connector should be revised to include
the grounds.

The case itself has been damaged. The screws that hold it together have stripped their housings and the
top is no longer secured. This case will have to be remade. This may be a good opportunity to change
the connector too if the designer so desires.

Additional info can be found in the engine review doc here.

Outcomes

The outcomes for the project are the following:

• create a case for the ETB driver
• create a new breakout board that pins the two main grounds

Constraints

• must be vibration resistant (must not fall apart on the car)

Related Issues

Related issues include:

• Wiring Schematic Cleanup #17 Wiring Schematic Cleanup
• Bench Wiring Harness Cleanup #16 Bench Wiring Harness Cleanup

[chadjmccolm]

To reduce the workload I would like to solder a jumper wire from the grounds we need onto the pins on the board just to add the grounds to the connector. Then the case will need to be rebuilt. A wooden case could be laser cut or a plastic case could be printed.

[chadjmccolm]

A plastic case will be produced at the same time as the #23 case. This case will be designed for splashproofing and running in the rain.

[chadjmccolm]

The learning from the old case is that printing threads does not work. We should probably print a hole big enough for a bolt to go all the way though and a pocket at the other end to hold the nut or use a glued threaded insert.

[chadjmccolm]

Looks like the existing PCB may be functional and I just misinterpreted it. It was designed with a ground plane that connects all the ground pins to the unused pins on the connector. This needs to be wired in with that assumption to make sure it works.

The case needs to be redone regardless.

[chadjmccolm]

Combined to #30