Digital Instrument Display For Cars

Siti Mariam , Hussain (2007) Digital Instrument Display For Cars. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The Digital Instrument Display for Cars is based on a PIC microcontroller. This project converts the analogue instruments in cars to a digital display. It is suitable for use with fuel gauges, oil pressure gauges or temperature gauges. It is designed to operate with any sensor or sender unit which varies its resistance or voltage signal output and display the result on a 3-digit LED readout. Basically, it is ideal for use with sender units that have relatively slow changing values. In operation, the unit can be calibrated so that the display will show any value in the range from -99 through to 999. The decimal point can also be placed in one of two positions, so that the values can be from -.99 to 99.9. In addition, the unit can be calibrated to display metric or imperial units. The Digital Instrument Display is calibrated at two values and the instrument calculates the remaining values from these in a linear fashion. For example, if the unit is to be used as a fuel gauge, it is best calibrated when the fuel tank is full and then calibrated when the tank is close to empty. The display will then subsequently be able to show the remaining fuel in the tank over the complete range from full to empty.

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