Circuit for quickly unlocking instrument by using fingerprint

Abstract

The utility model relates to the technical field of fingerprint identification, and particularly discloses a circuit for quickly unlocking an instrument by using fingerprints, which comprises an MCU (Microprogrammed Control Unit) control circuit and a fingerprint module circuit, and is characterized in that a second pin Touch end of the fingerprint module circuit, a fourth pin of the fingerprint module circuit and a fifth pin of the fingerprint module circuit are connected in series with a transient suppression diode A; the cathode end of each transient suppression diode is connected with the GND ground. According to the technical scheme, fingerprint unlocking replaces traditional digital key unlocking or screen digital key unlocking, on the premise that safety is guaranteed, the unlocking efficiency is improved, the using feeling of a device user is greatly improved, meanwhile, the situation that the device is used by other personnel due to password leakage is avoided, and the user experience is improved. A group of transient suppression diodes are connected in parallel between the Touch end, the fourth pin and the fifth pin of the fingerprint module circuit and the corresponding pins of the MCU control circuit, and the transient suppression diodes are connected with the grounding end, so that the MCU control circuit is subjected to anti-surge and anti-static protection.

Description

Technical Field

[0001] The utility model relates to the technical field of fingerprint identification, in particular to a circuit for quickly unlocking an instrument using a fingerprint. Background Art

[0002] With the rapid popularization of the Internet today, the logistics industry has also developed rapidly, and the requirements for fast and efficient logistics are getting higher and higher. The implementation of measures such as reducing costs and improving efficiency by enterprises has also led to the rapid development of automation control equipment technology. The use of automated equipment makes the use process safer and faster. Many instrument screens are digital keypads that require passwords to use, which is cumbersome in actual operation. Therefore, we propose a circuit that uses fingerprints to quickly unlock instruments. Utility Model Content

[0003] The utility model aims to provide a circuit for quickly unlocking an instrument using a fingerprint, thereby solving the problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a circuit for quickly unlocking an instrument using a fingerprint, comprising an MCU control circuit and a fingerprint module circuit, wherein pin 18 of the MCU control circuit is connected to the SPEAKER terminal, pin 19 of the MCU control circuit is connected to the REVERSE terminal, pin 20 of the MCU control circuit is connected to the MODE terminal, pin 41 of the MCU control circuit is connected to the UP terminal, pin 42 of the MCU control circuit is connected to the DOWN terminal, pin 43 of the MCU control circuit is connected to the FWD terminal, pin 45 of the MCU control circuit is connected to the BKWD terminal, pin 44 of the MCU control circuit is connected to the BOOTO terminal through a resistor R2 and the GND ground, pin 7 of the MCU control circuit is connected to one end of a capacitor C1 and one end of a resistor R1 respectively; pin 4 of the MCU control circuit is connected to pin 2 of the fingerprint module circuit Touch The MCU control circuit is connected to the +3.3V power supply, the other end of the resistor R1 is also connected to the +3.3V power supply, the 1st and 3rd pins of the fingerprint module circuit are also connected to the +3.3V power supply, the 9th pin of the MCU control circuit is connected to the +3.3VA analog power supply, the 23rd, 35th, 47th and 8th pins of the MCU control circuit are all connected to the GND ground, the other end of the capacitor C1 is also connected to the GND ground, the 6th pin of the fingerprint module circuit is also connected to the GND ground, the 2nd Touch terminal of the fingerprint module circuit, the 4th pin of the fingerprint module circuit and the 5th pin of the fingerprint module circuit are all connected in series with a transient suppression diode A, and the cathode end of each transient suppression diode is connected to the GND ground.

[0005] As a preferred implementation of the technical solution of the present application, the +3.3V power supply is connected in series with two transient suppression diodes B, the two transient suppression diodes B are connected in parallel with each other, and the cathode ends of the two transient suppression diodes B are connected to the GND ground.

[0006] As a preferred implementation of the technical solution of the present application, both the transient suppression diode A and the transient suppression diode B are TVS diodes.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0008] 1. The technical solution of the present application replaces the traditional digital button or screen digital button unlocking with fingerprint unlocking, which improves the efficiency of unlocking while ensuring security, greatly improves the user experience of the device, and also avoids the situation where the device is used by other people due to password leakage.

[0009] 2. The technical solution of the present application connects a group of transient suppression diodes in parallel between the Touch terminal, 4th pin, 5th pin of the fingerprint module circuit and the corresponding pins of the MCU control circuit, and the transient suppression diodes are connected to the ground terminal, so that when a surge current or a large electrostatic current is generated during the fingerprint recognition process, the transient suppression diodes are turned on, so that the surge or electrostatic current is introduced into the ground terminal through the turned-on transient suppression diodes, thereby providing surge and anti-static protection for the MCU control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0011] Figure 1 This is the signal line protection circuit of the utility model for anti-surge and anti-static fingerprint module;

[0012] Figure 2 This is the MCU control circuit diagram of the utility model;

[0013] Figure 3 This is a block diagram illustrating the function implementation of the utility model;

[0014] Figure 4 This is the circuit diagram of the fingerprint module of the utility model. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] Embodiment 1, as Figure 1-4As shown, the utility model provides a technical solution: a circuit for quickly unlocking an instrument using a fingerprint, comprising: pin 18 of an MCU control circuit connected to a SPEAKER terminal, pin 19 of the MCU control circuit connected to a REVERSE terminal, pin 20 of the MCU control circuit connected to a MODE terminal, pin 41 of the MCU control circuit connected to an UP terminal, pin 42 of the MCU control circuit connected to a DOWN terminal, pin 43 of the MCU control circuit connected to an FWD terminal, pin 45 of the MCU control circuit connected to a BKWD terminal, a BOOTO terminal of pin 44 of the MCU control circuit connected to a GND ground through a resistor R2, a NRST terminal of pin 7 of the MCU control circuit connected to one end of a capacitor C1 and one end of a resistor R1 respectively; pin 4 of the MCU control circuit connected to a Touch terminal of pin 2 of a fingerprint module circuit, and a MCU control circuit connected to a BOOTO terminal of a MCU control circuit connected to a GND ground through a resistor R2; a NRST terminal of pin 7 of the MCU control circuit connected to one end of a capacitor C1 and one end of a resistor R1 respectively; a 4th pin of the MCU control circuit connected to a Touch terminal of pin 2 of a fingerprint module circuit; a 4th pin of the MCU control circuit connected to a BOOTO terminal of a MCU control circuit connected to a GND ground through a resistor R2 ... BOOTO terminal of a MCU control circuit connected to a G Pin 30 of the circuit is connected to pin 5 of the fingerprint module circuit, pin 31 of the MCU control circuit is connected to pin 4 of the fingerprint module circuit, pin 1, pin 24, pin 48 and pin 36 of the MCU control circuit are all connected to the +3.3V power supply, the other end of the resistor R1 is also connected to the +3.3V power supply, pin 1 and pin 3 of the fingerprint module circuit are also connected to the +3.3V power supply, pin 9 of the MCU control circuit is connected to the +3.3VA analog power supply, pin 23, pin 35, pin 47 and pin 8 of the MCU control circuit are all connected to GND, the other end of the capacitor C1 is also connected to GND, pin 6 of the fingerprint module circuit is also connected to GND, the 2-pin Touch end of the fingerprint module circuit, the 4-pin fingerprint module circuit and the 5-pin fingerprint module circuit are all connected in series with transient suppression diode A, and the cathode end of each transient suppression diode is connected to GND.

[0017] In specific use, according to a circuit for quickly unlocking an instrument using a fingerprint as described in the utility model, the fingerprint module circuit transmits the collected fingerprint information to the MCU control circuit through the connection between pin 2 on the fingerprint module circuit and pin 4 of the MCU control circuit. The MCU control circuit compares the fingerprint. After the comparison is successful, the instrument can be unlocked, and the various functions of the instrument can be used normally. During fingerprint recognition, when the fingerprint module circuit generates electrostatic contact current or surge current, the electrostatic contact current and surge current are led to the ground terminal through the transient suppression diode, thereby protecting the MCU control circuit.

[0018] In a specific embodiment of the present invention, the specific implementation principle of the fingerprint unlocking instrument is as follows: Figure 3 As shown, the specific steps are as follows:

[0019] S1: Attachment Figure 4 The middle one is the fingerprint recognition module, which can collect fingerprints and has the characteristics of low power consumption, stability, good image consistency and high static resistance.

[0020] S2: Attached Figure 4The working principle of the fingerprint recognition module is that a finger is placed on a "flat plate" that integrates thousands of semiconductor devices, and it constitutes the other side of the semiconductor device. Since the finger plane is uneven, the actual distance between the convex and concave points in contact with the flat plate is different, and the formed values ​​are also different, so different values ​​are collected, and the fingerprint collection is completed after summarizing them.

[0021] S3: Attached Figure 4 Equipped with serial communication interface to connect with MCU, attached Figure 4 The data collected by the fingerprint module is packaged and sent to the MCU through the serial port for processing.

[0022] S4: After the collection is completed, the fingerprint stored in the MCU needs to be compared to unlock the instrument screen. If the collected fingerprint data is valid, it is compared with the fingerprint data stored in the MCU.

[0023] S5: If the similarity is high after comparison, the instrument screen can be unlocked successfully.

[0024] The principle of the transient suppression diode to protect the MCU control circuit from electrostatic contact current or surge current is as follows: the transient suppression diode model is SMF6.5CA. The transient suppression diode can quickly turn on when the device is subjected to overvoltage, thereby conducting the overvoltage energy to the ground, thereby protecting the MCU control circuit components in the device from damage. The rated working voltage of SMF6.5CA is 6.5V. When a voltage exceeding this voltage is applied, it will start to conduct.

[0025] In the preferred technical solution, the +3.3V power supply is connected in series with two transient suppression diodes B, the two transient suppression diodes B are connected in parallel with each other, the cathode ends of the two transient suppression diodes B are connected to the GND ground, the transient suppression diode A and the transient suppression diode B are both TVS diodes, and the +3.3V power supply is connected in series with two transient suppression diodes B, which can also provide surge current protection for the +3.3V power supply. The two transient suppression diodes B are connected in parallel with each other, which can improve the fault tolerance rate. As long as any one of the two transient suppression diodes B is normal, the surge current protection function can be performed normally.

[0026] Working principle: The fingerprint is first entered into the MCU control circuit through the fingerprint recognition module. When the instrument screen needs to be unlocked later, you only need to press the finger that entered the fingerprint against the fingerprint sensor. The fingerprint recognition will transmit the collected fingerprint to the MCU control circuit for comparison. If the comparison shows that they are the same fingerprint, the screen will be unlocked. If the comparison shows that they are not the same fingerprint, the screen will not be unlocked.

Claims

1. A circuit for quickly unlocking an instrument using a fingerprint, comprising an MCU control circuit and a fingerprint module circuit, wherein the 18th pin of the MCU control circuit is connected to the SPEAKER terminal, the 19th pin of the MCU control circuit is connected to the REVERSE terminal, the 20th pin of the MCU control circuit is connected to the MODE terminal, the 41st pin of the MCU control circuit is connected to the UP terminal, the 42nd pin of the MCU control circuit is connected to the DOWN terminal, the 43rd pin of the MCU control circuit is connected to the FWD terminal, the 45th pin of the MCU control circuit is connected to the BKWD terminal, the 44th pin of the MCU control circuit is connected to the GND ground through the resistor R2, and the 7th pin of the MCU control circuit is connected to one end of the capacitor C1 and one end of the resistor R1 respectively; the MCU control circuit Pin 4 of the circuit is connected to the Touch end of pin 2 of the fingerprint module circuit, pin 30 of the MCU control circuit is connected to pin 5 of the fingerprint module circuit, pin 31 of the MCU control circuit is connected to pin 4 of the fingerprint module circuit, pin 1, pin 24, pin 48, and pin 36 of the MCU control circuit are all connected to a +3.3V power supply, the other end of the resistor R1 is also connected to a +3.3V power supply, pin 1 and pin 3 of the fingerprint module circuit are also connected to a +3.3V power supply, pin 9 of the MCU control circuit is connected to a +3.3VA analog power supply, pin 23, pin 35, pin 47, and pin 8 of the MCU control circuit are all connected to GND, the other end of the capacitor C1 is also connected to GND, and pin 6 of the fingerprint module circuit is also connected to GND, characterized in that: The 2-pin Touch terminal of the fingerprint module circuit, the 4-pin Touch terminal of the fingerprint module circuit, and the 5-pin Touch terminal of the fingerprint module circuit are all connected in series with a transient suppression diode A, and the cathode end of each transient suppression diode is connected to the GND ground.

2. A circuit for quickly unlocking an instrument using a fingerprint according to claim 1, characterized in that: The +3.3V power supply is connected in series with two transient suppression diodes B, the two transient suppression diodes B are connected in parallel with each other, and cathode terminals of the two transient suppression diodes B are both connected to the GND ground.

3. A circuit for quickly unlocking an instrument using fingerprint according to claim 2, characterized in that: The transient suppression diode A and the transient suppression diode B are both TVS diodes.

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