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On-board minicomputer of the car

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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The device can be installed on any vehicle with 12 V on-board network voltage.

The main function

1.Remaining fuel in the tank in liters.
2.Voltage of the onboard network.
3. Engine operating temperature.
4. Air temperature outside the machine.
5. Changing the brightness of the display depending on the included side lighting (day / night).

Additionally, the computer has the following service capabilities

1. Calibration of the standard fuel level sensor.
2.Setting the display backlight level for day/night modes.
3.Change of the correction factor of the inertia of fuel level readings.

On-board minicomputer of the car. circuit diagram
(click to enlarge)

All instrument calibrations are performed by software. To measure the temperature, you need to install your own sensors dallas ds18b20.
The device is based on the AVR ATMega8 microcontroller manufactured by ATMEL. To measure the voltage of the on-board network, a separate contact is provided that can be connected directly to the battery or the ignition switch. As an indicator, an alphanumeric LCD indicator of the company MELT MT-16S2H was chosen, which can be successfully replaced with any other compatible with HD44780.

On-board minicomputer of the car. Fuses

Author: Vetrov Yuri Alexandrovich; Publication: cxem.net

See other articles Section Automobile. Electronic devices

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