Shorter display cable

I first bought the DIY edition and then a bit later the display and keyboard, none of which included the display cable, so I had the pi-top[4] docked to the back of the display, with the breakout adapter, a 6-foot hdmi cable, and multiple usb cables. It was a mess and took me about 5 minutes to order the display cable, but now that I have it, it is a lot better but definitely still messy in the docked configuration.

My vote is for the shunt adapter. :stuck_out_tongue:

And news on the short cable? Obviously you have been very busy with Christmas/NY, so not expecting it to be ready yet.

@GeekyTim we’re currently waiting until we need to do another production run of Display Cables - when we do we’ll produce a small batch of 50-100 of the shorter ones and let you know here :+1:

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Awesome! Put my name down for one of the short cables for when they arrive. :smiley: Can’t wait.

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Put my name down of the short cable.

Cool!

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i would be interested on one for sure, but at this time i am using my pi-top screen for my Xavier NX just working though some testing i have done on the pi-top already :slight_smile: but yeah, i definetly want one

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@duwudi Do you have the specification for the display port available? I’d like to know so I can maybe build my own by taking measurements and running it through JLCPCB and the I could post the adapter as open source? Hehe :wink:

@Supernovali sure, see attached pinout. You’ll notice a few differences between our pi-top Display Port and the USB-C spec but in terms of signal type on the various pins it’s compliant - we just don’t have the reversible feature that USB-C has (for many, many reasons it just didn’t make sense for us to go to that trouble).

Please note that we have the HDMI HPD pin pulled up to 10k to comply with CC pin spec of USB-C (to inform downstream devices we can supply 3A at 5V), but in our HDMI adapter and in the FHD Display this goes through a NOT gate to flip it to match HDMI HPD spec.

2021-02-07%2011_06_47-pi-top%20%5B4%5D%20Architecture_%20Lucidchart

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Sweet! So for the hpd pin, the display and the pi-top invert the signal so it’s just buffered? Or the cable includes the not gate and the pull up is done on the hardware?

Yeah our display inverts it, but we also have to invert it inside the HDMI adapter that plugs onto the Display Cable to allow it to be compatible with other HDMI displays

Also if you want to design the adapter, I’d be happy to do the mechanical design and give you a layout DXF. We just need to find part numbers and STEP files for the vertical connectors. If you want to have a call to kick this off send me a DM :handshake:

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I think OSHPark would be great for this effort if someone can do the design.

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Me and @Supernovali have been collaborating on the design for the shunt adapter. He’s already finished a first version and waiting on prototypes - if anyone wants to test them let him know :+1: (although we only have limited number at this time)

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@duwudi @Supernovali I’d certainly be up for testing if ya need somone to :slight_smile:

Is compatible with the foundation plate or just the pitop by itself docked

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Currently just the pi-top by itself. But now that you mention that it can be docked (don’t currently have the robotics kit) I might be looking into making a version that is compatible with both

@Supernovali I do have an idea for a board, if ya ok for me to DM ya about it

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Go for it :slight_smile: I’m all ears :ear::joy:

@duwudi @Supernovali I would love to test the shunt! Please let me know if you can spare one.

I’d also be happy to test/pay for one.

Hey guys! I just finished up the first prototype and I have to make a second one due to a couple of mistakes and errors. I’m currently planning on next weekend for the first round of testers. I currently already have 5 testers which is the my testing cycle, 2 of which already have display issues and 2 which have known good machines, plus the founders of pi-top to share one.

Currently, building a single display bridge costs about 6 dollars to make due to the low quantities. But, if you would also like to be part of the testing team, Id be happy to include you guys for the preproduction prototypes, with no additional cost besides the cost of shipping out to you. (My plan was when I get the initial prototypes done, to make one more iteration to make sure that the final kinks are worked out, and do the testing on my own, granted the initial prototypes work with other people’s hardware)

@jwktje and @modulusx, when I get the second iteration tested, I’ll PM you if you’re still interested to get the preproduction prototypes. Preproduction prototyping will be ready to go in about 3-4 weeks. And then after that, it will be available on Amazon. I’m not sure what the shipping rates would be like from Amazon, but if you know about how much it costs/how long shipping takes to your area from SLC , Utah, you can make a decision based off of that. My plan is to to sell for a very small margin, maybe 50%. That barely covers the costs for amazon’s 14% cut and electricity/energy producing, but this is really just a way to get my company name out into the community. Final version will then be between 10-12 USD. I’m not sure how much amazon would charge for shipping.

Hopefully these factors help you guys to decide if it’s cheaper to wait for the final product or cheaper to get the preproduction prototype :wink: