877

@SashaGrace thanks again for the information, here is a link to the principle of reading the can-bus data: https://www.instructables.com/id/CAN-Bus-Sniffing-and-Broadcasting-with-Arduino/ To get started testing it should work with a laptop and the following: Arduino UNO Can-bus shield OBD cable My application is only to read the can-bus signals, so there should be no need to purchase a towbar module, or emulate any signals. Hopefully the arduino code could be made to recognise the relevant signals (left, right, reverse, brakes) and send an output of some sort. Initially the outputs could be easily sent to a phone app such as Blynk, to confirm the signal are being read correctly. In the end solution they would be transmitted to another arduino in the remote trailer board, probably via bluetooth. According to the linked can bus guide here and here, it looks like there are typically three can-bus networks (drive/convenience/infotainment). It seems the lighting is on the convenience can-bus which runs at low speed 100kbps (orange/green & orange/brown wiring). So maybe I would need to connect to the J533 pin 5 & 15 to check this all out first. I was kind of hoping that the convenience can-bus wiring ran into the boot somewhere, as it would be easier to connect everything there, and would ultimately be closer to the remote tailboard so communication would be better. Also, I think all of this can be accessed via the normal obd2 port, in which case do all of the can-bus's terminate there somehow? I'm going to do a bit more reading, any other help is much appreciated! Chris

Thanks again that's very helpful. I'm going to have a good look at this tomorrow when I'm back from work. I will gather some info for you to explain how to read the can-bus data. Cheers

Hey Sasha thanks for that! The project I have in mind is to create a wireless number plate light board. It's more of a hobby thing, I know I could buy something but I like a little project. First step of this is to feed the car signals (indicator L, indicator R, reverse and brake) into an esp32 arduino which would transmit the signals over bluetooth. As I said the options are: 1) Read directly from can-bus - most elegant solution but may be difficult to 'sniff' the relevant commands, also might need wiring to front of car? 2) Utilise tow bar module - as you said certainly not going to be there 3) Tap into existing wiring from rear light units - using high resistance voltage dividers should not draw more than a few microamps which I hope would not be detected/throw up an error There are no CAN connections in the boot area then it would seem? Any info you have would be useful, and if you could explain more what those wiring looms are for in your photo. Cheers Chris

I have the 2018 Octavia VRS estate mk3 2.0 184hp, with power boot option but I did not choose towbar wiring at order. I'm looking for a position in the boot where I can access the following wiring (in order of preference): 1) CAN-BUS for lighting 2) towbar modules (I did not purchase factory fit so might not be there) 3) Indicator/brake/reverse wiring Any tips would be appreciated, it's for an electronics project I have in mind and I'm checking the feasibility. Thanks

I searched to see if anyone had this problem, and found my own very old post! 😂 Anyone help yet?

When searching for a name e.g. "Dave", it finds anyone named "Davexxxxxxxxxxx". But does not find people e.g. "Work Dave". Any ideas? Photo: (Skoda Octavia 2018 - Amundsen 8" touchscreen with wifi)

I would think of the accelerator like a variable resistor, the more you press the more resistance goes up (or down). These pedal boxes just take the input resistance and change it to a new value, so the car reacts differently to accelerator position. eg old=new 0% = 0% 5%=10% 10%=20% etc 100%=100% Obviously it's more sophisticated than that

@245GT how did you get on, notice a difference? Thinking of getting me one too

I see the confusion, the first post wasn't by me, i never asked for vcds help. But anyhow a fair assumption Yes I guess VAG do not want us poking around. I was having trouble yesterday with coding the audi throttle mod. Strange, I went in today and it worked first time via long coding and didn't ask for a security code. I also coded the "driving profile switchover" as per this thread, the code 19249 worked but have not noticed any difference with either after a short drive around. This is what I have coded so far (in reverse order), thanks for the replies!

@SWBoy thanks, yes I see what you mean, but I thought this was a Skoda support forum? So I don't understand why I can't ask here for obdeleven advice. In all seriousness am I missing something?

@SWBoy thanks but I’m using obdeleven as it’s just a home project for me. I’m guessing obdeleven is not well liked by Ross-tech? As there are not that many guides/help for it. Cheers

@Mr Grump @Mico01 did you get it working - using obdeleven I am asked for a security code - any ideas?

@grennessthanks for the post, but I am asked for security access code (mines an Octavia '18 plate). Any ideas?

Same issue here, code 12345 works for some things but for engine it doesn't work.

Thanks guys, Yes I would definitely long code having read about some issues, I am quite careful with that kind of thing. I used to code my last two bmw's so am more used to long coding style anyway. I was more concerned about obdeleven not being able to code the basics, as you said @Gizmo peope are quite secretive with any coding i find, just a few generous individuals. Cheers