AVR Based Car Computer Known as XARIAS

The project is designed to show several information such as momentary speed, journey time, many average indicators, passed distance, and momentary fuel consumption since it uses an AVR microcontroller equipped with LCD display and various sensors.

An Atmel ATmega32 MCU control is the heart of the project and is used to run the embedded system XARIAS in order to gain different information from the car and be displayed in human-readable form. Any gasoline powered car can be used to install XARIAS since it connects directly to fuel injectors, rpm sensor, and speed sensor. It supports Samsung KS0108 and Hitachi HD44780 compatible displays.

The DS1307 RTC was chosen since it has programmable square wave output signal, automatic power fail detect & switch circuitry, and 56 bytes of nonvolatile memory. The statistics and preferences are stored by the nonvolatile memory and the measurement routines are triggered by the output signal. In order to avoid most distortions, correct square wave signal uses the high speed CMOS logic hex Schmitt-triggered inverters. The contrast and brightness of the LCD display are controlled by the double digital potentiometer. A simple 4×3 keyboard is used by the XARIAS.

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