ONE ERROR

[toprakb66]

"Hello my friend, I hope you're doing well. I made this project and connected everything according to the schematic you showed using Arduino Nano. I also added the code and connected it to the car, but I can't establish communication with the OBD no matter what I do. There's no communication, and I'm about to lose my mind. Can you give me some ideas?"

[toprakb66]

[toprakb66]

Bunu iyi anlıyorum, ancak bu ECU'lardan önce ECU'ya bağlanmak için bir katman var. Öncelikle belirli ECU'dan veri istemek için iletişime geçmeniz gerekiyor. Do you have any idea how we can do this?

[muki01]

This is exactly what my code is trying to do. It works fine for me. Did you change the timings in the code and test?

[toprakb66]

I tested it by changing lines 97 and 99 one by one.

[toprakb66]

On my WiFi OBD device, it shows "ISO14230-4 (5baud) start" when selecting the protocol automatically. Is this an important detail?

[muki01]

On my WiFi OBD device, it shows "ISO14230-4 (5baud) start" when selecting the protocol automatically. Is this an important detail?

No

[muki01]

İn line 97 write delay(5); and test. Dont change other in line 99. If this not work try delay(200) and test again.

[muki01]

And test with delay(50)

[toprakb66]

Buddy, my car is out of town, I'll test it as soon as possible.

[toprakb66]

"Friend, I have another car with K-line, a Lada Samara, and I got these errors as well: Initialising... Received Data: FF 0 0 Writing Data Received Data: 1 3 F1 81 66 Initialising... Received Data: 3F 0 0 Writing Data

[toprakb66]

So, it means there’s no problem with the car. Are you running this code with an ESP32, or could there be a problem with my Arduino Nano?"

[toprakb66]

Can I learn more details about your circuit? Were you able to get the transistor-based circuit to work?"

[toprakb66]

After extensive research, I found that some people have modified your transistor-based circuit in this way. What do you think about this?

[toprakb66]

"I placed an order for the L9637D along with its schematic, buddy. I hope this solves the issue this time. :("

[muki01]

Can I learn more details about your circuit? Were you able to get the transistor-based circuit to work?"

Yes, the schemes work, I have tried both the schemes that I have given. I have tried with Arduino Uno, Arduino Nano, ESP32 Wroom, ESP32 C3 and ESP32 S3 and everything works perfectly.

[muki01]

Your problem should not be from the schemes I have shared. It could be because of the breadboard. Many people have had a problem with the schemes they made on the breadboard, me too. Either it's from that or it's from the timings in the code.