Multifunctional screen key control circuit

Abstract

The utility model discloses a key control circuit, belongs to the technical field of electronic information, and particularly relates to a multifunctional screen key control circuit, which comprises a logic chip U1, and a key matrix circuit, a buzzer driving circuit, a data storage circuit, a video signal conversion circuit and a control signal driving circuit which are connected with the logic chip U1, the key matrix circuits are connected with the logic chip at the same time, each key matrix circuit comprises one or more matrix keys, the matrix keys are 4 * 4 matrix keys controlled by K1-K16, the 4 * 4 key matrix structure is adopted, I / O ports are multiplexed through row lines and column lines, 16-path key control is achieved through 8 I / O ports, and the key matrix circuits are connected with the logic chip at the same time. Meanwhile, an external integrated interface is adopted, a buzzer, a relay and an EEPROM interface are integrated, and functions can be expanded without an extra circuit.

Description

Technical Field

[0001] This utility model discloses a button control circuit, belonging to the field of electronic information technology, specifically relating to a multi-functional screen button control circuit. Background Technology

[0002] The function of the screen button control circuit is to detect button operations and transmit commands to switch and control device functions. When the user presses a screen button, the circuit detects a change in pressure and triggers signal transmission.

[0003] Traditional screen button control circuits typically employ a "one button, one interface" design when implementing multi-button functions. In this design, each button is directly connected to the controller's I / O port via a wire. This approach generally suffers from drawbacks such as excessive I / O port usage, weak anti-interference capabilities, limited functionality, and low integration. Utility Model Content

[0004] Purpose of the utility model: To provide a multi-functional screen button control circuit to solve the problems mentioned above.

[0005] Technical solution: A multi-functional screen button control circuit, comprising: a logic chip U1, and a button matrix circuit, a buzzer driver circuit, a data storage circuit, a video signal conversion circuit and a control signal driver circuit connected to the logic chip U1;

[0006] The key matrix circuit has several units and is connected to the logic chip simultaneously. Each key matrix circuit includes one or more matrix keys, which are 4*4 matrix keys controlled by K1-K16.

[0007] In a further embodiment, the logic chip U1 uses an STM32F103RCT6 as the main controller.

[0008] In a further embodiment, the buzzer driving circuit includes: resistor R5, buzzer B1, resistor R8, resistor R7, LED diode D6, resistor R9, and transistor Q2;

[0009] One end of resistor R8 is connected to the BEEP pin of logic chip U1, resistor R5 is connected to the 3.3V operating voltage pin of logic chip U1, pin 1 of buzzer B1 is connected to the other end of resistor R5, the collector of transistor Q1 is connected to pin 2 of buzzer B1, the base is connected to the other end of resistor R8 and one end of resistor R9, and the emitter is grounded to the other end of resistor R9. One end of resistor R7 is connected to the 3.3V operating voltage pin of logic chip U1, and the other end is connected to pin 1 of LED diode D6. The other end of LED diode D6 is connected to the STATUS pin of logic chip U1.

[0010] In a further embodiment, the data storage circuit includes a storage chip U4, a resistor R14, a capacitor C17, and a resistor R15;

[0011] Pins 1-4 of the memory chip U4 are grounded. Pin 8 of the memory chip U4, one end of resistor R14, and one end of resistor R15 are simultaneously connected to the 3.3V operating voltage pin of the logic chip U1. Pin 7 of the memory chip U4 is grounded. Pin 6 of the memory chip U4 and the other end of resistor R15 are connected to the I2C_SCL pin of the logic chip U1. Pin 5 of the memory chip U4 and the other end of resistor R14 are connected to the I2C_SDA pin of the logic chip U1. One end of capacitor C17 is connected to the 3.3V operating voltage pin of the logic chip U1, and the other end is grounded.

[0012] In a further embodiment, the video signal conversion circuit includes: a level conversion chip U5, capacitors C26, C14, and C25, a Zener diode D8, resistors R21 and R22, capacitor C15, an iron core inductor L2, a resistor R20, an LED diode D9, and a capacitor C8.

[0013] Pin 5 of the level conversion chip U5 is simultaneously connected to one end of capacitor C26 and one end of capacitor C14, providing a 5V operating voltage. Pin 2 of the level conversion chip U5 is simultaneously grounded to the other ends of capacitors C26 and C14. Pin 1 of the level conversion chip U5 is connected to one end of capacitor C25. Pin 6 of the level conversion chip U5 is simultaneously connected to the other end of capacitor C25, one end of the iron-core inductor L2, and pin 2 of the Zener diode D8. The other end of the iron-core inductor L2 is simultaneously connected to one end of resistor R21 and the capacitor... One end of C15 and one end of the capacitor C28 are connected to the 3.3V operating voltage pin of the logic chip U1. Pin 3 of the level conversion chip U5 is connected to the other end of the resistor R21 and one end of the resistor R22. Pin 1 of the Zener diode D8, the other end of the resistor R22, the other end of the capacitor C15, and the other end of the capacitor C28 are grounded. One end of the resistor R20 is connected to the 3.3V operating voltage pin of the logic chip U1, and the other end is connected to pin 1 of the LED diode D9. Pin 2 of the LED diode D9 is grounded.

[0014] In a further embodiment, the control signal driving circuit includes: bidirectional diode D2, Zener diode D1, electrolytic capacitor CT1, electrolytic capacitor CT2, switch K1, diode D5, Zener diode D4, resistor R12, resistor R16, capacitor C20, resistor R10, resistor R3, capacitor C3, resistor R6, transistor Q1, diode D3, and relay RELAY1;

[0015] The positive terminal of the Zener diode D1 and one end of the bidirectional diode D2 are connected to a 12V operating voltage. The negative terminal of the Zener diode D1 is simultaneously connected to pin 1 of the electrolytic capacitor CT1, pin 1 of the electrolytic capacitor CT2, and pin 3 of the relay RELAY1. Pin 1 of the electrolytic capacitor CT2 is connected to a 12VDC voltage. The other ends of the bidirectional diode D2, the electrolytic capacitor CT1, and the relay RELAY1 are grounded. One end of the switch K1 is connected to a 12VDC voltage, and the other end is simultaneously connected to pin 1 of the diode D5 and one end of the resistor R12. The positive terminal of the Zener diode D4 is connected to the RELAY pin of the logic chip U1. The other end of the resistor R12 and one end of the resistor R16 are connected to the KEY pin of the logic chip U1. The DET pin connects the negative terminal of Zener diode D4 to pin 2 of diode D5, one end of capacitor C20, and one end of resistor R10. The base of transistor Q1 is connected to the other end of resistor R10 and one end of resistor R6, and its emitter is grounded to the other end of resistor R6. The other end of resistor R16 is grounded, and the other end of capacitor C20 is grounded. Pin 2 of relay RELAY1 receives a 12V_LS voltage. Pin 4 of relay RELAY1 is connected to one end of resistor R3 and pin 2 of diode D3. The other end of resistor R3 is connected to one end of capacitor C3. Pin 1 of relay RELAY1 is connected to the other end of capacitor C3, pin 1 of diode D3, and the collector of transistor Q1.

[0016] In a further embodiment, the logic chip U1 is connected to a resistor R1, a crystal oscillator Y1, a capacitor C1, a capacitor C2, a resistor R2, a resistor R4, a capacitor C4, an inductor FB1, an inductor FB2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, and a capacitor C13.

[0017] Pin 28 of the logic chip U1 is connected to one end of resistor R1, and the other end of resistor R1 is grounded. Pin 5 of the logic chip U1 is connected to one end of capacitor C1 and pin 1 of crystal oscillator Y1. Pin 6 of the logic chip U1 is connected to pin 2 of crystal oscillator Y1 and one end of capacitor C2, and the other ends of capacitor C1 and C2 are grounded. Pin 7 of the logic chip U1 is connected to one end of resistor R4 and one end of capacitor C4, and the other end of resistor R4 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of capacitor C4 is grounded. One end of inductor FB1 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of the capacitor and one end of the capacitor C5 are connected to the VDDA pin of the logic chip U1. One end of the inductor FB2 is grounded, and the other end is grounded to the other end of the capacitor C5. One end of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are connected to the 3.3V operating voltage pin of the logic chip U1. The other ends of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are grounded.

[0018] In a further embodiment, the buttons K1-K16 in the button matrix circuit are physical microswitches and are embedded below a designated area of ​​the screen.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] 1. Reduces controller I / O port usage and supports 16-channel button control;

[0021] 2. Enhance anti-interference capabilities and avoid false triggering;

[0022] 3. Supports multi-functional recognition including short press, long press, and combination keys;

[0023] 4. Integrate peripheral interfaces such as buzzers and relays to improve circuit integration. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is the circuit diagram of the logic chip of this utility model.

[0026] Figure 3This is a schematic diagram of the buzzer drive circuit of this utility model.

[0027] Figure 4 This is a schematic diagram of the data storage circuit of this utility model.

[0028] Figure 5 This is a schematic diagram of the video signal conversion circuit of this utility model.

[0029] Figure 6 This is a schematic diagram of the control signal drive circuit of this utility model.

[0030] Figure 7 This is a schematic diagram of the key matrix circuit of this utility model.

[0031] Figure 8 This is a schematic diagram of the working process of this utility model. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] A multi-functional screen button control circuit, such as Figure 1 As shown, it includes: a logic chip U1, and a key matrix circuit, a buzzer driver circuit, a data storage circuit, a video signal conversion circuit, and a control signal driver circuit connected to the logic chip U1.

[0034] Example 1:

[0035] like Figure 3 As shown, the buzzer drive circuit includes: resistor R5, buzzer B1, resistor R8, resistor R7, LED diode D6, resistor R9, and transistor Q2;

[0036] One end of resistor R8 is connected to the BEEP pin of logic chip U1, resistor R5 is connected to the 3.3V operating voltage pin of logic chip U1, pin 1 of buzzer B1 is connected to the other end of resistor R5, the collector of transistor Q1 is connected to pin 2 of buzzer B1, the base is connected to the other end of resistor R8 and one end of resistor R9, and the emitter is grounded to the other end of resistor R9. One end of resistor R7 is connected to the 3.3V operating voltage pin of logic chip U1, and the other end is connected to pin 1 of LED diode D6. The other end of LED diode D6 is connected to the STATUS pin of logic chip U1.

[0037] Specifically, the buzzer driver circuit provides operational sound feedback. The circuit is directly integrated with the peripheral interface. The logic chip U1 controls the switch through the transistor Q2. The buzzer (B1) triggers a prompt sound after the button is pressed (such as a short press "beep" sound, a long press "beep-" sound).

[0038] Example 2:

[0039] like Figure 4 As shown, the data storage circuit includes a storage chip U4, a resistor R14, a capacitor C17, and a resistor R15;

[0040] Pins 1-4 of the memory chip U4 are grounded. Pin 8 of the memory chip U4, one end of resistor R14, and one end of resistor R15 are simultaneously connected to the 3.3V operating voltage pin of the logic chip U1. Pin 7 of the memory chip U4 is grounded. Pin 6 of the memory chip U4 and the other end of resistor R15 are connected to the I2C_SCL pin of the logic chip U1. Pin 5 of the memory chip U4 and the other end of resistor R14 are connected to the I2C_SDA pin of the logic chip U1. One end of capacitor C17 is connected to the 3.3V operating voltage pin of the logic chip U1, and the other end is grounded.

[0041] Specifically, the data storage (EEPROM) circuit uses an AT24C512C-5510C memory chip to store user configuration data.

[0042] Example 3:

[0043] like Figure 5 As shown, the video signal conversion circuit includes: level conversion chip U5, capacitor C26, capacitor C14, capacitor C25, Zener diode D8, resistor R21, resistor R22, capacitor C15, iron core inductor L2, resistor R20, LED diode D9, and capacitor C8.

[0044] Pin 5 of the level conversion chip U5 is simultaneously connected to one end of capacitor C26 and one end of capacitor C14, providing a 5V operating voltage. Pin 2 of the level conversion chip U5 is simultaneously grounded to the other ends of capacitors C26 and C14. Pin 1 of the level conversion chip U5 is connected to one end of capacitor C25. Pin 6 of the level conversion chip U5 is simultaneously connected to the other end of capacitor C25, one end of the iron-core inductor L2, and pin 2 of the Zener diode D8. The other end of the iron-core inductor L2 is simultaneously connected to one end of resistor R21 and the capacitor... One end of capacitor C15 and one end of capacitor C28 are connected to the 3.3V operating voltage pin of logic chip U1. Pin 3 of level conversion chip U5 is connected to the other end of resistor R21 and one end of resistor R22. Pin 1 of Zener diode D8, the other end of resistor R22, the other end of capacitor C15, and the other end of capacitor C28 are grounded. One end of resistor R20 is connected to the 3.3V operating voltage pin of logic chip U1, and the other end is connected to pin 1 of LED diode D9. Pin 2 of LED diode D9 is grounded.

[0045] Specifically, the video signal conversion circuit uses the LMH160500DOCK(U5) level conversion chip to convert a 3.3V logic signal into a 5V video signal, thus solving the problem of level mismatch between the MCU (3.3V) and the screen (possibly 5V).

[0046] Example 4:

[0047] like Figure 6 As shown, the control signal driving circuit includes: bidirectional diode D2, Zener diode D1, electrolytic capacitor CT1, electrolytic capacitor CT2, switch K1, diode D5, Zener diode D4, resistor R12, resistor R16, capacitor C20, resistor R10, resistor R3, capacitor C3, resistor R6, transistor Q1, diode D3, and relay RELAY1;

[0048] The positive terminal of the Zener diode D1 and one end of the bidirectional diode D2 are connected to a 12V operating voltage. The negative terminal of the Zener diode D1 is simultaneously connected to pin 1 of the electrolytic capacitor CT1, pin 1 of the electrolytic capacitor CT2, and pin 3 of the relay RELAY1. Pin 1 of the electrolytic capacitor CT2 is connected to a 12VDC voltage. The other ends of the bidirectional diode D2, the electrolytic capacitor CT1, and the relay RELAY1 are grounded. One end of the switch K1 is connected to a 12VDC voltage, and the other end is simultaneously connected to pin 1 of the diode D5 and one end of the resistor R12. The positive terminal of the Zener diode D4 is connected to the RELAY pin of the logic chip U1. The other end of the resistor R12 and one end of the resistor R16 are connected to the KEY pin of the logic chip U1. The DET pin connects the negative terminal of Zener diode D4 to pin 2 of diode D5, one end of capacitor C20, and one end of resistor R10. The base of transistor Q1 is connected to the other end of resistor R10 and one end of resistor R6, and its emitter is grounded to the other end of resistor R6. The other end of resistor R16 is grounded, and the other end of capacitor C20 is grounded. Pin 2 of relay RELAY1 receives a 12V_LS voltage. Pin 4 of relay RELAY1 is connected to one end of resistor R3 and pin 2 of diode D3. The other end of resistor R3 is connected to one end of capacitor C3. Pin 1 of relay RELAY1 is connected to the other end of capacitor C3, pin 1 of diode D3, and the collector of transistor Q1.

[0049] Specifically, the control signal drive circuit uses the control signal from the logic chip U1 to drive the transistor Q1, thereby enabling the button to control the switching of external loads (such as motors and lights).

[0050] Example 5:

[0051] like Figure 7 As shown, the key matrix circuit has several units and is connected to the logic chip simultaneously. Each key matrix circuit includes one or more matrix keys, which are 4*4 matrix keys controlled by K1-K16.

[0052] In the button matrix circuit, buttons K1-K16 are physical microswitches and are embedded below a designated area of ​​the screen.

[0053] Specifically, when a user touches the screen, the capacitor detects the location and then activates the corresponding micro-switch backlight, triggering the physical switch when pressed.

[0054] Example 6:

[0055] like Figure 2As shown, the logic chip U1 uses an STM32F103RCT6 as the main controller.

[0056] The logic chip U1 is connected to resistor R1, crystal oscillator Y1, capacitor C1, capacitor C2, resistor R2, resistor R4, capacitor C4, inductor FB1, inductor FB2, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12 and capacitor C13.

[0057] Pin 28 of the logic chip U1 is connected to one end of resistor R1, and the other end of resistor R1 is grounded. Pin 5 of the logic chip U1 is connected to one end of capacitor C1 and pin 1 of crystal oscillator Y1. Pin 6 of the logic chip U1 is connected to pin 2 of crystal oscillator Y1 and one end of capacitor C2, and the other ends of capacitor C1 and C2 are grounded. Pin 7 of the logic chip U1 is connected to one end of resistor R4 and one end of capacitor C4, and the other end of resistor R4 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of capacitor C4 is grounded. One end of inductor FB1 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of the capacitor and one end of the capacitor C5 are connected to the VDDA pin of the logic chip U1. One end of the inductor FB2 is grounded, and the other end is grounded to the other end of the capacitor C5. One end of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are connected to the 3.3V operating voltage pin of the logic chip U1. The other ends of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are grounded.

[0058] Specifically, the logic chip U1 and the case matrix circuit of this utility model can achieve the following functions:

[0059] Short press recognition: If a button is released within 500ms after being pressed, it is determined to be a short press (such as triggering a single function).

[0060] Long press recognition: Pressing the button for more than 1 second is considered a long press (such as entering settings mode);

[0061] Key combination recognition: When two or more keys are pressed simultaneously (e.g., K1+K2), a specific function is triggered (e.g., restoring factory settings).

[0062] like Figure 8As shown, the working principle of this utility model is as follows:

[0063] First, the user presses a button. Buttons K1-K16 in the button matrix circuit send signals to logic chip U1 according to the instructions. Then, logic chip U1 receives the signal and sends a control command to the data storage circuit. Storage chip U4 queries the EEPROM configuration and then feeds back the configuration to logic chip U1. Logic chip U1 sends a control command to the buzzer driver circuit, buzzer B1 emits a prompt tone, and then the operation ends.

[0064] This utility model adopts a 4×4 button matrix design: by multiplexing I / O ports through row and column lines, 16-way button control can be achieved with 8 I / O ports, reducing resource consumption;

[0065] Multi-functional button recognition algorithm: It can distinguish between short press, long press and combination key by using time threshold and multi-key status detection;

[0066] Integrated peripheral interface: It integrates a buzzer, relay, and EEPROM interface, allowing for functional expansion without additional circuitry.

[0067] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A multi-functional screen button control circuit, characterized in that, include: The logic chip U1, and the key matrix circuit, buzzer driver circuit, data storage circuit, video signal conversion circuit and control signal driver circuit connected to the logic chip U1; The key matrix circuit has several units and is connected to the logic chip simultaneously. Each key matrix circuit includes one or more matrix keys, which are 4*4 matrix keys controlled by K1-K16.

2. The multi-functional screen button control circuit according to claim 1, characterized in that, The logic chip U1 uses an STM32F103RCT6 as the main controller.

3. The multi-functional screen button control circuit according to claim 1, characterized in that, The buzzer drive circuit includes: resistor R5, buzzer B1, resistor R8, resistor R7, LED diode D6, resistor R9, and transistor Q2; One end of resistor R8 is connected to the BEEP pin of logic chip U1, resistor R5 is connected to the 3.3V operating voltage pin of logic chip U1, pin 1 of buzzer B1 is connected to the other end of resistor R5, the collector of transistor Q1 is connected to pin 2 of buzzer B1, the base is connected to the other end of resistor R8 and one end of resistor R9, and the emitter is grounded to the other end of resistor R9. One end of resistor R7 is connected to the 3.3V operating voltage pin of logic chip U1, and the other end is connected to pin 1 of LED diode D6. The other end of LED diode D6 is connected to the STATUS pin of logic chip U1.

4. The multi-functional screen button control circuit according to claim 1, characterized in that, The data storage circuit includes a storage chip U4, a resistor R14, a capacitor C17, and a resistor R15; Pins 1-4 of the memory chip U4 are grounded. Pin 8 of the memory chip U4, one end of resistor R14, and one end of resistor R15 are simultaneously connected to the 3.3V operating voltage pin of the logic chip U1. Pin 7 of the memory chip U4 is grounded. Pin 6 of the memory chip U4 and the other end of resistor R15 are connected to the I2C_SCL pin of the logic chip U1. Pin 5 of the memory chip U4 and the other end of resistor R14 are connected to the I2C_SDA pin of the logic chip U1. One end of capacitor C17 is connected to the 3.3V operating voltage pin of the logic chip U1, and the other end is grounded.

5. The multi-functional screen button control circuit according to claim 1, characterized in that, The video signal conversion circuit includes: level conversion chip U5, capacitor C26, capacitor C14, capacitor C25, Zener diode D8, resistor R21, resistor R22, capacitor C15, iron core inductor L2, resistor R20, LED diode D9, and capacitor C8. Pin 5 of the level conversion chip U5 is simultaneously connected to one end of capacitor C26 and one end of capacitor C14, providing a 5V operating voltage. Pin 2 of the level conversion chip U5 is simultaneously grounded to the other ends of capacitors C26 and C14. Pin 1 of the level conversion chip U5 is connected to one end of capacitor C25. Pin 6 of the level conversion chip U5 is simultaneously connected to the other end of capacitor C25, one end of the iron-core inductor L2, and pin 2 of the Zener diode D8. The other end of the iron-core inductor L2 is simultaneously connected to one end of resistor R21 and the capacitor... One end of C15 and one end of the capacitor C28 are connected to the 3.3V operating voltage pin of the logic chip U1. Pin 3 of the level conversion chip U5 is connected to the other end of the resistor R21 and one end of the resistor R22. Pin 1 of the Zener diode D8, the other end of the resistor R22, the other end of the capacitor C15, and the other end of the capacitor C28 are grounded. One end of the resistor R20 is connected to the 3.3V operating voltage pin of the logic chip U1, and the other end is connected to pin 1 of the LED diode D9. Pin 2 of the LED diode D9 is grounded.

6. The multi-functional screen button control circuit according to claim 1, characterized in that, The control signal driving circuit includes: bidirectional diode D2, Zener diode D1, electrolytic capacitor CT1, electrolytic capacitor CT2, switch K1, diode D5, Zener diode D4, resistor R12, resistor R16, capacitor C20, resistor R10, resistor R3, capacitor C3, resistor R6, transistor Q1, diode D3, and relay RELAY1. The positive terminal of the Zener diode D1 and one end of the bidirectional diode D2 are connected to a 12V operating voltage. The negative terminal of the Zener diode D1 is simultaneously connected to pin 1 of the electrolytic capacitor CT1, pin 1 of the electrolytic capacitor CT2, and pin 3 of the relay RELAY1. Pin 1 of the electrolytic capacitor CT2 is connected to a 12VDC voltage. The other ends of the bidirectional diode D2, the electrolytic capacitor CT1, and the relay RELAY1 are grounded. One end of the switch K1 is connected to a 12VDC voltage, and the other end is simultaneously connected to pin 1 of the diode D5 and one end of the resistor R12. The positive terminal of the Zener diode D4 is connected to the RELAY pin of the logic chip U1. The other end of the resistor R12 and one end of the resistor R16 are connected to the KEY pin of the logic chip U1. The DET pin connects the negative terminal of Zener diode D4 to pin 2 of diode D5, one end of capacitor C20, and one end of resistor R10. The base of transistor Q1 is connected to the other end of resistor R10 and one end of resistor R6, and its emitter is grounded to the other end of resistor R6. The other end of resistor R16 is grounded, and the other end of capacitor C20 is grounded. Pin 2 of relay RELAY1 receives a 12V_LS voltage. Pin 4 of relay RELAY1 is connected to one end of resistor R3 and pin 2 of diode D3. The other end of resistor R3 is connected to one end of capacitor C3. Pin 1 of relay RELAY1 is connected to the other end of capacitor C3, pin 1 of diode D3, and the collector of transistor Q1.

7. The multi-functional screen button control circuit according to claim 1, characterized in that, The logic chip U1 is connected to resistor R1, crystal oscillator Y1, capacitor C1, capacitor C2, resistor R2, resistor R4, capacitor C4, inductor FB1, inductor FB2, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12 and capacitor C13. Pin 28 of the logic chip U1 is connected to one end of resistor R1, and the other end of resistor R1 is grounded. Pin 5 of the logic chip U1 is connected to one end of capacitor C1 and pin 1 of crystal oscillator Y1. Pin 6 of the logic chip U1 is connected to pin 2 of crystal oscillator Y1 and one end of capacitor C2, and the other ends of capacitor C1 and C2 are grounded. Pin 7 of the logic chip U1 is connected to one end of resistor R4 and one end of capacitor C4, and the other end of resistor R4 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of capacitor C4 is grounded. One end of inductor FB1 is connected to the 3.3V operating voltage pin of the logic chip U1. The other end of the capacitor and one end of the capacitor C5 are connected to the VDDA pin of the logic chip U1. One end of the inductor FB2 is grounded, and the other end is grounded to the other end of the capacitor C5. One end of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are connected to the 3.3V operating voltage pin of the logic chip U1. The other ends of the capacitors C6, C7, C8, C9, C10, C11, C12, and C13 are grounded.

8. The multi-functional screen button control circuit according to claim 1, characterized in that, The buttons K1-K16 of the button matrix circuit are physical microswitches and are embedded below a designated area of ​​the screen.

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