Circuit diagram of mileage fuel consumption calculator (1)

The seven-segment light-emitting diode 2-digit tube of this circuit can continuously display fuel consumption efficiency. The displayed number is the number of miles per gallon of gasoline. The entire electrical appliance is made of CMOS integrated circuits; including gasoline flow sensor and vehicle speed sensor, the total cost Less than $ 25. This circuit uses a frequency multiplier to generate the output pulse train; the output frequency is proportional to the input product; the output frequency averages the time; the speed sensor is connected in series with the speedometer cable, which feeds the speed data to the clock input of the CD4527 frequency multiplier The oil and gas flow sensor is connected in series with the fuel consumption line, which feeds the fuel consumption data to the clock input of another frequency multiplier.