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my inner-Geek is loving the thread--hack onward!
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I will post a more details later. It looks like the PIC is providing clock and converting from UART over LVDS to I2C.
For the technical geeks like me here is the proposed schematic and layout for the switch. The board is designed in a Newageenclosures case.
View attachment 35806
View attachment 35807
WhiteP85 (and artsci).... These are not criticisms, but just some questions/concerns I have... What trace impedances are you targeting? it's difficult to tell from the small image, but are those traces length-matched within the pair? The LVDS pairs look like they are tightly-coupled, and the traces look very wide. In tightly-couple traces, the traces should be in-phase (length matched per segment). Since board space doesn't appear to be an issue, switching to loosely-coupled pairs can ease-up on a lot of restrictions and make length-matching and routing better. Do you want to provide the trace length measurements, PCB stack-up, and mechanical dimensions so that some of this can be verified? If artsci's board failed due to poor signal-integrity, then this must be done right. Do you (or anyone else with the cable in-hand) have access to a TDR to measure the characteristic impedance of Tesla's OEM cable? Or is that specified/labeled on the insulator? Are there published specs on those connectors as well?
WhiteP85 (and artsci).... These are not criticisms, but just some questions/concerns I have... What trace impedances are you targeting? it's difficult to tell from the small image, but are those traces length-matched within the pair? The LVDS pairs look like they are tightly-coupled, and the traces look very wide. In tightly-couple traces, the traces should be in-phase (length matched per segment). Since board space doesn't appear to be an issue, switching to loosely-coupled pairs can ease-up on a lot of restrictions and make length-matching and routing better. Do you want to provide the trace length measurements, PCB stack-up, and mechanical dimensions so that some of this can be verified? If artsci's board failed due to poor signal-integrity, then this must be done right. Do you (or anyone else with the cable in-hand) have access to a TDR to measure the characteristic impedance of Tesla's OEM cable? Or is that specified/labeled on the insulator? Are there published specs on those connectors as well?
Hi WhiteP85,
I had no sense of scale in your image so thanks for the additional information. With that, it's clear that your trace dimensions are correct. I would still say that it is slightly preferable to route loosely-coupled pairs. The current tightly coupled pairs are length matched from end-to-end, but are not matched at each segment. This will negatively affect the differential signal as it propagates and becomes skewed mid-way through. BUT with a 2-layer, 1.6mm-thick PCB, the 3mm trace widths and at least 5- to 6- mm spacing may not be practical. Plus, with trace lengths as short as they are, I don't foresee a major problem with leaving it as is. I'm assuming a solid, well-connected ground plane underneath the pairs.
I did a general check of your logic in the schematics and all seems correct and reasonable to me! Great job!
For those in states that require a front license plate, we're also going make for the kit a 3D printed cradle to hold the front camera. It will attach with small screws to the lower part of the standard Tesla front license plate holder.
For those in states that require a front license plate, we're also going make for the kit a 3D printed cradle to hold the front camera. It will attach with small screws to the lower part of the standard Tesla front license plate holder.
Will there be an option for those that mounted the license plate in the lower (no drill) position?
Mounting on the lower portion of the plate bracket is probably too low and mounting in the nose cone would cause the image to be blocked by the plate.
Hey WhiteP85 any luck with switching the front camera to NORMAL view, and not reversed?