Obd xp

CAN ESP32

The loose wire goes to 3rd pin from the bottom (DTR?).

Summary

New cars do chimes when turning on the engine. My '06 Focus does not. This device aims to rectify that! An ESP32 with an micro sd card reader, paired with a MAX9860 to play .wav files upon receiving certain CAN messages. CAN connection handled by the TJA1050. Powered from the OBD2 port 12V rail, with two buck converters for 5V and 3V.

Is an AP that serves a Preact App for listening in on the CAN network via a websocket connection.

Avaialble through obd2.local with the help of mdns!

On plugging in plays the windows XP startup sound.

I don't get any OBD responses from my 2006 Focus, but I can clear DTC's!

Would need to decode raw CAN frames to make sense of anything.

TODO

• [FW/FE] Read DTC

• [FW] Play audio on startup (800RPM) and shutdown (?) (0RPM).

• [FW] SD Card logger.

• [FE][FW] Oil Temp request/response, visualization.

• [XX] Update PCB [IC<>IC level shifter, CAN caps, 32[TX], 33[RX]]

• [FE] GZIP the Preact app

• [FW] Spiffs for web app storage?

• Plug in device to gather more data points - need to decipher the messages.

Notes to future self

• Implement the upload mechanism that all ESP32 baords use. Turning things on/off is annoying.
• Serial monitoring during operation would be great!

How to flash

1. Connect the FTDI FT232RL and power it on.
2. Connect 12V, GND leads and power on the power supply.
3. Turn off both, turn back the power supply.

Dev Board

Keep down the boot button while powering on.

Julie OBD2 emulator

RED: VCC BLUE: GND GREEN: CODE (UNCONNECTED/GND) BLACK: CAN-H WHITE: CAN-L

Sketchy link: https://lisaiauto.ru/universalnyj-emulyator-julie-of80-manual-po-nastrojke-i-podklyucheniyu/

SPIFFS

OBDII Response addresses

0x7DF is a broadcast to all devices. 0x7E8 should be the engine 0x7e9 should be transmission

Websocket

• Must enable WS in SDK
• Must increase HTTP URI Length in SDK

TJA1050

TX & RX should be swapped when connecting - RX goes to TX, RX to TX as usual.

SD Card

Files present on the SD card at /

• xp/oxp.wav
• xp/vistashutdown.wav

VSC

Instal LLVM and use theclang-format extension for formatting. link

IDF

ESP-IDF projects are built using CMake. The project build configuration is contained in CMakeLists.txt files that provide set of directives and instructions describing the project's source files and targets (executable, library, or both).

Below is short explanation of remaining files in the project folder.

├── CMakeLists.txt
├── main
│   ├── CMakeLists.txt
│   └── main.c
└── README.md                  This is the file you are currently reading

Additionally, the sample project contains Makefile and component.mk files, used for the legacy Make based build system. They are not used or needed when building with CMake and idf.py.