JPS6263784A - Code number setting circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to electric locks, etc. that open the door only when a password entered manually using a numeric keypad or the like matches a preset password. The present invention relates to a circuit for setting a PIN number.

In conventional devices that use a password, such as an electric lock, a manually entered number and a preset password are input into a microcomputer to determine whether the numbers match.

FIG. 4 shows an example of the circuit, in which 1 is a password setting section, 2 is an input key section, and 3 is a microcomputer.

The password setting section 1 consists of a large number of switches, and is connected to the input port of the microcomputer 3 via a composite resistor 4. In addition, the input key section 2 is connected to the input ports l1fI2tL, L and output ports of the microcomputer 3.
0. ．． 02. A switching matrix consisting of O, is used. The microcomputer 3 then compares the input from the PIN number setting section and the input from the input key section 2 to determine whether the two numbers match.

<Problem to be solved by the invention> However, as mentioned above, the microcomputer 3
If input from the identification number establishment section 1 is applied and a switching matrix composed of input/output ports is used as the input key section 2, a large number of input/output ports of the microcomputer are required, and the numerical values are The microcomputer program was complicated and a lot of processing time was required because the system was made to compare and make decisions.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a password setting circuit that has a simple circuit configuration and requires short processing time.

<Means for Solving the Problems> In order to achieve the above object, the present invention individually identifies only the key to be set as a password between the input key unit and the microcomputer, and identifies the other keys separately. The device is provided with a setting section that connects the input key section and the micro combiator so as to detect only that a key is pressed.

<Function> The signals of the pressed keys are sequentially input to the input ports of the microcomputer, and when the input order is correct, the signals match the PIN number.1. I judge that.

<Example> The present invention will be specifically described below with reference to the illustrated example 1).

FIG. 1 shows an embodiment of the present invention, in which a 4-digit password can be set. , I7. Predetermined keys of the input key unit 9 to which the composite resistor 8 is connected are individually connected to L and L by the password setting unit 6 via the composite resistor 5, and to the input port ■, Composite resistor 8 via diode 7
All the keys of the input key section 9 to which are connected are connected.

In this circuit, the setting section 6 and the diode 7 constitute a so-called password setting circuit 10. Therefore, for example, if the setting section 6 is wired as shown by the dotted line, the input port L of the microcomputer 3 will go to the "Low" level only when the key "1" is pressed. Similarly, input port ■2 has key r2J, input port I has key "3"
However, the input board 14 goes "Low" and emits a bell only when the keys (4J) are pressed.Then, the microcomputer 3 inputs the password (assuming that the password is 1234J). Only when I, , L, L, and L become "Low" level in that order as shown in Figure 2, the password and the pressed key] correspond to the entered number. The program is programmed to determine that there is a match. In addition, when input port I is at "Low" level, each input port 1..I2.L and L are both "Low".
If the level is not correct, it is determined that the key operation was an error, and the input can be repeated.

Further, FIG. 3 shows a rotary switch 16 as the setting section 6.
The PIN number setting circuit 11 is configured using
This makes setting the password even easier.

Although the above embodiment shows a 4-digit PIN, a PIN with a different number of digits can be easily realized by simply considering the number of input ports and the connection of the setting section. be.

As described above, the present invention provides a password setting section between the input key section and the microcomputer, and determines whether the input number and the password match only by the input order of the input ports. By doing so, it does not require many input/output ports of the microcomputer, which simplifies the circuit configuration and allows it to be realized at low cost.
Furthermore, since the program is extremely limited, processing time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an embodiment of the present invention.
FIG. 3 is a circuit diagram showing the embodiment of the pond, and FIG. 4 is a circuit diagram showing a conventional example. 3...Microcomputer 6...Setting section 7...Diode Q-, 1+7-stand y

Claims (1)

[Claims] (1) In a device in which a microcomputer determines whether a preset PIN number and a number entered from an input key section match, a PIN number is used between the input key section and the microcomputer. A PIN code characterized by having a setting section that connects an input key section and a microcomputer so that only keys to be set are individually identified, and other keys are only detected when they are pressed. Setting circuit.