CN102304995A

CN102304995A - Circuit for code lock of electric vehicle

Info

Publication number: CN102304995A
Application number: CN201110165425A
Authority: CN
Inventors: 章小宝; 李文杰; 吴誉兰
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2011-06-20
Filing date: 2011-06-20
Publication date: 2012-01-04

Abstract

The invention relates to a circuit for a code lock of an electric vehicle, comprising a singlechip basic circuit, a code input keyboard circuit, a code input indicating and storing circuit and a power control circuit of the electric vehicle. The circuit is used for replacing a traditional U-shaped lock with the code lock of the electric vehicle; and the electric vehicle can be driven only when the code is rightly input; and therefore, the electric vehicle is effectively prevented being stolen.

Description

A kind of electric motor car cipher lock circuit

Technical field

The present invention relates to a kind of cipher lock circuit that prevents that effectively electric motor car from being stolen.

Background technology

At present, all there is stolen phenomenon in a lot of electric motor cars, and people worry that the electric motor car of oneself is stolen, so it is necessary to replace traditional U type lock to design a kind of stolen cipher lock circuit of electric motor car that can prevent.

Summary of the invention

The purpose of this invention is to provide a kind of electric motor car cipher lock circuit design.

Technical scheme of the present invention is:

This circuit mainly is made up of four parts: be respectively single-chip microcomputer basic circuit, cipher inputting keyboard circuit, password input indication and memory circuit, electric vehicle power sources control circuit.

First is the basic circuit of single-chip microcomputer.Mainly by the AT89S52 single-chip microcomputer, and clock circuit and reset circuit are formed.The single-chip microcomputer clock circuit connects 18,19 pin of single-chip microcomputer, is made up of crystal oscillator Y1 and capacitor C 2, C3, produces the frequency of 12MHz, and this frequency is the essential condition of single-chip microcomputer operate as normal.The reset circuit of single-chip microcomputer is by working power, two resistance R 1, R2, and capacitor C 1 and button S9 form, and mainly play the circuit work that resets, and this circuit connects 9 pin of single-chip microcomputer.Single-chip microcomputer IO mouth P1.0-P1.7, P2.0-P2.6 links to each other with external circuit respectively.

Second portion is the cipher inputting keyboard circuit.Mainly be made up of 4 Х, 4 matrix keyboards, 4 Х, 4 matrix keyboards totally 16 buttons, its mainly by 0～9 totally 10 numerical keys, definite key, cancel key, one key, a unlock key and a blocking wedge are set form.Matrix keyboard connects the P1 mouth of single-chip microcomputer.

Third part is password input indication and memory circuit.Mainly form by two light emitting diodes and an eeprom chip.Red light emitting diodes D1 connects the P2.3 mouth of single-chip microcomputer, is used for password input indication, and when pressing unlock key or key being set, D1 lights, and can input password this moment.Green LED D2 connects the P2.4 mouth of single-chip microcomputer, is used for the correct indication of password input, behind the input password, presses definite key; If password is correct, then D2 lights, if continuous three password input errors; Then D2 glimmered one minute continuously, and cannot input password this moment again.Warning circuit connects the P2.5 mouth of single-chip microcomputer, and when password input is correct, buzzer sends short sound prompting, and when continuous three password input errors, the long sound of buzzer was rung one minute.The write-protect pin of eeprom chip AT24C02 connects the P2.0 of single-chip microcomputer, and IIC communication pin connects the P2.1 and the P2.2 of single-chip microcomputer respectively.AT24C02 is used to preserve initial password and amended password, can guarantee that the power down password do not lose.

The 4th part is the electric vehicle power sources control circuit.Circuit mainly is made up of relay, and after pressing unlock key, the password of input is correct, then relay work, and electric vehicle power sources is connected, and electric motor car can start this moment.When pressing blocking wedge, then relay is not worked, and electric vehicle power sources breaks off, electronic can't the startup.Circuit is connected with the P2.6 of single-chip microcomputer.

Beneficial effect of the present invention: this circuit is used for the electric motor car coded lock and replaces traditional U type lock, has only correct input password could drive electric motor car, thereby prevents that effectively electric motor car from being stolen.

Description of drawings

Fig. 1 is the single-chip microcomputer basic circuit.Single-chip microcomputer IO mouth P1.0-P1.7, P2.0-P2.6 links to each other with external circuit respectively, and 18,19 pin connect the clock circuit of single-chip microcomputer, and 9 pin connect the reset circuit of single-chip microcomputer.P1.0-P1.7 connects 4 Х, 4 matrix keyboards, is used for password input and circuit control.P2.0, P2.1, P2.2 meet eeprom chip AT24C20 and are used for password storage.P2.3, P2.4 connect red light emitting diodes and green green LED respectively, as the circuit working indicator lamp.P2.5 connects triode and drives buzzer, is used for circuit alarm.P2.6 connects triode and drives relay, the control electric vehicle power sources.

Fig. 2 is the cipher inputting keyboard circuit.Circuit constitutes 4 Х, 4 matrix keyboards by 16 buttons, and it connects the P1 mouth of single-chip microcomputer.Wherein 10 numerical keys are used to input 8 passwords, confirm that key is used to import careful sign indicating number back and confirms that it is to return that cancel key is used for input error; When revising password is to press key is set, and can revise password this moment, in the time will unblanking; Can press unlock key, input password then, password is then electric vehicle power sources connection correctly; When pressing blocking wedge, electric vehicle power sources breaks off.

Fig. 3 is password input indication and memory circuit.Red light emitting diodes D1 and green LED D2 meet P2.3, P2.4 respectively, and buzzer MK1 meets P2.5 through triode, when pressing unlock key; Red light emitting diodes D1 lights, and can input password this moment, when pressing definite key; Whether the password of contrast input is identical with predefined password; If identical, then green LED D2 lights, and buzzer MK1 sends short sound prompting.If continuous three input password bads, green LED D2 flicker one minute, buzzer MK1 sends long sound caution.Memory circuit connects the P2.0～P2.2 mouth of single-chip microcomputer, and after import careful sign indicating number, pressing definite key, single-chip microcomputer compares the password of input and the password of AT24C02 storage.Memory circuit can guarantee that the power down password do not lose.

Fig. 4 is the electric vehicle power sources control circuit.It connects the P2.6 mouth of single-chip microcomputer.After pressing unlock key, the password of input is correct, then relay K 1 work, and electric vehicle power sources is connected, and electric motor car can start this moment.After pressing blocking wedge, relay K 1 is not worked, and electric vehicle power sources breaks off, electronic can't the startup.

The specific embodiment

Under the device normal operating conditions, when owner leaves electric motor car, press blocking wedge, electric vehicle power sources breaks off, and can't start.Owner can relievedly leave.When owner will start electric motor car, press unlock key, this moment, red light emitting diodes was lighted, import correct password after, electric vehicle power sources connection, electric motor car can normally start.When owner wants to revise password, after the input proper password, when promptly green LED is lighted, to press key is set, can input the password that will revise this moment, presses and confirm that red and green luminous diode glimmers three times simultaneously after the key, and prompting is revised successfully.

Claims

1. electric motor car cipher lock circuit is characterized in that: said circuit is made up of with memory circuit, electric vehicle power sources control circuit single-chip microcomputer basic circuit, cipher inputting keyboard circuit, password input indication;

(1) basic circuit of single-chip microcomputer is by the AT89S52 single-chip microcomputer, and clock circuit and reset circuit are formed; The single-chip microcomputer clock circuit connects 18,19 pin of single-chip microcomputer; Be made up of crystal oscillator Y1 and capacitor C 2, C3, the reset circuit of single-chip microcomputer is by working power, two resistance R 1, R2; Capacitor C 1 and button S9 form; This circuit connects 9 pin of single-chip microcomputer, single-chip microcomputer IO mouth P1.0-P1.7, and P2.0-P2.6 links to each other with external circuit respectively;

(2) the cipher inputting keyboard circuit is made up of 4 Х, 4 matrix keyboards; 4 Х, 4 matrix keyboards are totally 16 buttons; Mainly by 10 numerical keys, definite key, cancel key, one key, a unlock key and a blocking wedge be set form, matrix keyboard connects the P1 mouth of single-chip microcomputer;

(3) password input indication is made up of two light emitting diodes and an eeprom chip with memory circuit; Red light emitting diodes D1 connects the P2.3 mouth of single-chip microcomputer; Green LED D2 connects the P2.4 mouth of single-chip microcomputer; The write-protect pin of eeprom chip AT24C02 connects the P2.0 of single-chip microcomputer, and IIC communication pin connects the P2.1 and the P2.2 of single-chip microcomputer respectively;

(4) the electric vehicle power sources control circuit is made up of relay, and circuit is connected with the P2.6 of single-chip microcomputer.