Automobile fuel starvation warning circuit

Abstract

The invention discloses an automobile fuel starvation warning circuit capable of reminding a driver of fuel capacity of an automobile in time. The circuit comprises a comparator, wherein the inverting input end of the comparator is connected with one end of a fourth resistor, the other end of the fourth resistor is connected with a center head of a float-type potentiometer, and the center head of the float-type potentiometer is located on the fuel surface of an automobile fuel tank; a first resistor is connected to the non-inverting input end of the comparator, the output end of the comparator is connected with one end of a sixth resistor and one end of a fifth resistor, the other end of the fifth resistor is connected to the non-inverting input end of the comparator, and the other end of the sixth resistor is connected with the base electrode of a first triode; the emitting electrode of the first triode is connected with the positive electrode of a power supply through a thirteenth resistor, the collector electrode of the first triode is connected with the base electrode of a second triode through an eleventh resistor, the collector electrode of the second triode is connected with the negative electrode of a light emitting diode, the positive electrode of the light emitting diode is connected with one end of a fourteenth resistor, and the emitting electrode of the second triode is grounded.

Description

technical field

[0001] The invention relates to an automobile fuel shortage alarm circuit. Background technique

[0002] The amount of oil stored in the fuel tank of a car is related to the mileage of the car, especially for cars that need to travel long distances, the amount of oil stored is very important. The way people check the fuel storage capacity of cars at present is to manually open the trunk of the car, open the tank cover of the fuel storage tank of the car to check the fuel storage capacity. The lower limit value makes it impossible to drive; it is inconvenient to check. Contents of the invention

[0003] The present invention intends to provide an automobile fuel shortage alarm circuit which can timely remind the driver of the fuel quantity of the automobile.

[0004] The car fuel shortage alarm circuit in this program includes a comparator, the reverse input terminal of the comparator is connected to one end of the fourth resistor, and the other end of the...

Examples

Embodiment Construction

[0010] The present invention will be described in further detail below by means of specific embodiments:

[0011] The reference signs in the drawings of the description include: float potentiometer RP, first resistor R1, second resistor R2, third resistor R3, first capacitor C1, second capacitor C2, comparator IC1, third capacitor C3, Fifth resistor R5, sixth resistor R6, seventh resistor R7, fourth capacitor C4, eighth resistor R8, monostable trigger IC2, fifth capacitor R5, buzzer HA, ninth resistor R9, tenth resistor R10, the first transistor VT1, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the power supply VCC, the second transistor VT2, the Zener diode VS, and the light emitting diode VL.

[0012] The embodiment is basically as attached figure 1 Shown: the car fuel shortage alarm circuit of this embodiment, the center head of the float type potentiometer RP is located on the oil surface of the car fuel t...

technical field

[0001] The invention relates to an automobile fuel shortage alarm circuit. Background technique

[0002] The amount of oil stored in the fuel tank of a car is related to the mileage of the car, especially for cars that need to travel long distances, the amount of oil stored is very important. The way people check the fuel storage capacity of cars at present is to manually open the trunk of the car, open the tank cover of the fuel storage tank of the car to check the fuel storage capacity. The lower limit value makes it impossible to drive; it is inconvenient to check. Contents of the invention

[0003] The present invention intends to provide an automobile fuel shortage alarm circuit which can timely remind the driver of the fuel quantity of the automobile.

[0004] The car fuel shortage alarm circuit in this program includes a comparator, the reverse input terminal of the comparator is connected to one end of the fourth resistor, and the other end of the...

Examples

Embodiment Construction

[0010] The present invention will be described in further detail below by means of specific embodiments:

[0011] The reference signs in the drawings of the description include: float potentiometer RP, first resistor R1, second resistor R2, third resistor R3, first capacitor C1, second capacitor C2, comparator IC1, third capacitor C3, Fifth resistor R5, sixth resistor R6, seventh resistor R7, fourth capacitor C4, eighth resistor R8, monostable trigger IC2, fifth capacitor R5, buzzer HA, ninth resistor R9, tenth resistor R10, the first transistor VT1, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the power supply VCC, the second transistor VT2, the Zener diode VS, and the light emitting diode VL.

[0012] The embodiment is basically as attached figure 1 Shown: the car fuel shortage alarm circuit of this embodiment, the center head of the float type potentiometer RP is located on the oil surface of the car fuel t...

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