UART on Ring Doorbe...
 
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UART on Ring Doorbell 2nd gen

Aakra
(@aakra)
New Member

Any here that have any experience with UART?

I have a Ring Doorbell 2nd gen I need to find it on for my bachelor project but cannot seem to find it. If anyone have any idea I will be happy to share pictures of the board for any pointers.

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Topic starter Posted : 08/03/2021 9:36 pm
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trewmte
(@trewmte)
Community Legend

@aakra does this help https://gracefulsecurity.com/finding-serial-interfaces-uart/

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Posted : 09/03/2021 12:18 am
Aakra
(@aakra)
New Member

@trewmte

I have been looking at a lot of different guides, including that one. My problem probably is that this is my first time actually even looking at a board so I have no clue what I am looking for. I tried probing using my multimeter as well, but I really have no clue what I am looking for, where and what I should probe.

 

Seeing guides saying find GND by probing this and this, and my board is not looking close to the same so I just keep scratching my head

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Topic starter Posted : 10/03/2021 12:44 am
trewmte
(@trewmte)
Community Legend
Posted by: @aakra

I will be happy to share pictures of the board for any pointers.

Maybe post clear photos of the board 

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Posted : 10/03/2021 7:28 am
Aakra
(@aakra)
New Member

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Topic starter Posted : 10/03/2021 2:53 pm
Aakra
(@aakra)
New Member

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Topic starter Posted : 10/03/2021 2:54 pm
Aakra
(@aakra)
New Member

@trewmte

 

Just let me know if u need better ones 

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Topic starter Posted : 10/03/2021 3:16 pm
trewmte
(@trewmte)
Community Legend

@aakra if the manufacturer's Ring Doorbell PCB is consistent with their current security approach to remove and/or reduce attack surfaces as mentioned in this article https://medium.com/tenable-techblog/inside-amazons-ring-alarm-system-9731bc519974 then hunting for UART might not give you what you are looking to achieve.

Thanks for the photos, I will look at them tomorrow. 

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Posted : 10/03/2021 11:56 pm
trewmte
(@trewmte)
Community Legend

@aakra The photo with number 8CS9202S.0A2G appears to show (similar to Gen1 test points) at the top of the board in the middle there are six below and five above. Have you tried testing these at all?

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Posted : 11/03/2021 1:04 pm
Aakra
(@aakra)
New Member

@trewmte

Have tried to probe them but might just be me who are doing it wrong. I do not have much knowledge with this so I pretty much just probes randomly around

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Topic starter Posted : 11/03/2021 2:08 pm
Passmark
(@passmark)
Active Member

I think even experienced electronics engineers would have trouble with this (if it wasn't their own boards and didn't have a circuit diagram).

Are you even sure there is even a UART on the board in question?

Maybe you should be looking for a JTAG interface?

 

 

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Posted : 24/03/2021 12:36 am
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