🚗OBD2 K-line Reader

This code is for reading the K-Linke in Cars. With this code you can read sensor values, troubleshoot codes and more. It is compatible with ISO9141 and ISO14230(KWP slow and fast) protocols. I have shared schematics to communicate with the car. You can use these schematics or you can make another one. I used Arduino nano and ESP32 C3 as microcontrollers, but you can use another microcontrollers like STM32, ESP8266 and much more.

I will share more information about K-Line protocols and communication later. Stay tuned 😉.

You can also see this project for I/K Bus for BMW cars

⚙️Instalation

• Open .ino file
• 📚Instal these Libraries

  - ESPAsyncWebServer
  - AsyncTCP
  - ArduinoJson
  

• Edit the pins for your Board

  #define K_Serial Serial
  #define K_line_RX 20
  #define K_line_TX 21
  #define Led 8
  #define Buzzer 1
  #define voltagePin 0
  

• If you are using ESP32 C3,S2 or S3 board, you need to disable "USB CDC On Boot" option in Tools menu
• Change Partition Scheme to "Huge APP (3MB No OTA, 1MB SPIFFS)" in Tools menu
• Upload the code to your Board
• Upload the Website to SPIFFS.
  • To upload the Web Site, you can use PlatformIO or you can upload with tool for Arduino IDE v1.x.x
    Here is documentation how to upload files to SPIFFS with Arduino IDE.

📱Pictures of the application I made

🛠️Schematics for communication

This is the schematic with Transistors

This is the schematic with L9637D

The device I made with ESP32 C3 SuperMini.