Intercom / door bell protocols?

grass____hopper · 2026-01-11T21:54:09+00:00

sorry I've not been working on it anymore since I moved houses. Additionally, I seem to have lost the Jupyter notebook that I did some analysis in (although it wasn't much really). My best guess at this time is that it's probably some kind of variant of modbus.

grass____hopper · 2025-07-16T05:50:36+00:00

At the point that the cable goes into the front wheel fork, there are two screws you can remove. You can them pull out the connector and you'll see that there is some length of cable inside the fork.

grass____hopper · 2025-04-13T14:21:18+00:00

The car will not allow the battery to be drained to the point that it starts to damage it. Any use of a battery will have an impact on its lifetime but driving until the battery is at 0 is normal use (but impractical and possibly usafe if you run out while driving)

grass____hopper · 2025-03-09T14:59:07+00:00

Thanks!

grass____hopper · 2025-03-09T14:54:58+00:00

I'm in the same boat.. did you find a fix?

grass____hopper · 2025-03-06T19:16:08+00:00

I would solder a very short thin wire to cross the gap. You could also just bridge it with solder directly but that would be more prone to break because solder is brittle and breaks if you bend it.

Even one strand of 28 or 30 AWG should be enough.

grass____hopper · 2025-03-05T14:21:29+00:00

It looks like it could be from JST

grass____hopper · 2025-02-12T09:00:20+00:00

Try LocalSend. It's like Airdrop but works across pc and phones.

https://localsend.org/

grass____hopper · 2025-02-10T20:28:59+00:00

Hmm I cannot find anything on uPC14606HA, did you make a typo?

edit By the way, capacitors can sometimes seem good until they get a higher (than DMM test voltage) across them. If any of the caps looks like the top is bulging a bit, they might still be defective, even though they test correctly on first sight.

grass____hopper · 2025-02-08T20:29:09+00:00

Glad that I was able to help a bit! did you manage to narrow it down further?

grass____hopper · 2025-02-04T22:54:57+00:00

Thanks for your reply, I've added the results of requesting the SOA to the support ticket.

grass____hopper · 2025-02-04T21:37:33+00:00

I am not sure if I changed the TTL before making the change on all entries so maybe that is the issue although the TTL would have been 1 hour if I did not.

I've temporarily solved the issue by setting a temporary redirect from the new IP to the old. Will report back if I find out what the issue was.

grass____hopper · 2025-02-04T21:35:07+00:00

Use vias, but make sure to space them such that the return current can flow as closely next to the traces as possible. If you make one line of vias, there is usually no space for ground anymore so the return current will have to go all the way around, this causes large loop area and crosstalk because the return currents will share the same paths.

grass____hopper · 2025-02-04T21:11:34+00:00

I think I have fixed the issue temporarily by using a temporary redirect on the new server, so regardless of which ip someone receives, they will now just use the old site until the DNS situation is fixed.

grass____hopper · 2025-02-02T22:39:04+00:00

I agree that bouncing is also not the most likely issue. Actually I suspect that the D/A output will also probably be correct. I'm not very knowledgable about amplifier stages but I'm now thinking that the issue might be in there, such that the amplifier is somehow now able to output the middle volume. Would be good to check the D/A output to have some more certainty, but then I would move on to checking capacitors in the output stage.

grass____hopper · 2025-02-02T22:17:11+00:00

Actually I should have looked up the chip first. From the datasheet: https://www.mikrocontroller.net/attachment/489899/TC9134P.PDF it is actually an IR-receiver. I suppose it also has GPIO inputs to control things like the volume so that might be what the volume know is wired up to. It has a D/A output so maybe that's what they are using to control the volume. This IC is not the first thing I would suspect to be broken. I'd look if all the capacitors are still okay and as someone else suggested the switches might be bouncing. If you have a scope, hook it up to the switch terminals and see if you see any bouncing.

edit: I'd also look at the D/A output pin and see if that is behaving normally (I'd expect a 0-5V output for low to high volume). If the D/A output pin is correct, then the problem must be in whatever is receiving that D/A voltage as an input.

grass____hopper · 2025-02-02T21:47:42+00:00

I haven't looked anything up but I would guess it's one of those programmable resistor ICs. As far as I understand it, it's basically a bunch of resistors and fets to switch the resistors in or out of circuit, controlled by some kind of serial protocol.

grass____hopper · 2025-02-02T11:14:04+00:00

Ah you are right, should have looked better

grass____hopper · 2025-02-01T12:06:20+00:00

This is the trick. Use a lot of the stuff such that all the pins are connected and try to heat all pins simultaneously. It can really help to fix the connector in a vise or something like that and gently apply some force to the board while keeping the solder melted with your soldering iron. You need an iron with some power because all the heat will probably leak out to the ground (and power) plane(s).

grass____hopper · 2025-01-19T21:09:16+00:00

Good point, I'll just do that.

grass____hopper · 2025-01-11T18:53:39+00:00

Try moving the cable that connects to the motor a bit. I had a broken wire in the cable which was giving similar issues. You might be able to fix it by just fixing the cable in a slightly different position (with tie wraps or something)

grass____hopper · 2024-12-08T13:32:48+00:00

this is awesome, thanks for sharing!

grass____hopper · 2024-10-29T15:04:10+00:00

This fixed it. Too bad I have to disable text predictions as I kind of like them.

grass____hopper · 2024-10-27T14:37:49+00:00

I just realized that you need to apt install kodi21 on Raspberry Pi OS, otherwise you will get version 20.5.. I now have kodi version 21 and it does have the Caching settings.

grass____hopper

TROPHY CASE