An ESP32 based OBD2 reader module with RGB LEDs for coolant and oil temperature measurement. The code is made for Mazda 6 GJ (2015) 2.2d engines. DPF regeneration cycle is shown with the warm white LED activated. The complete KiCad project and 3D model for printing the housing is free to use for home applications. ESP32 code is uploaded via UART on the dedicated pin array on the hardware. Buttons for reset and boot modes are available on HW.
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