CN214704970U

CN214704970U - Intelligent answer board

Info

Publication number: CN214704970U
Application number: CN202022659131.4U
Authority: CN
Inventors: 黄世荣; 张毅; 陈雯珊; 杨璐璐; 巫利荣
Original assignee: Fujian Nebula Big Data Application Service Co ltd
Current assignee: Fujian Nebula Big Data Application Service Co ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-11-12
Anticipated expiration: 2030-11-17

Abstract

The utility model provides an intelligence answer board, including central processing unit MCU, LCD china ink screen, touch-control handwriting pad, power drive module, flash storage module, button module, status light module, wiFi drive module, touch-control drive module and LCD drive module are connected with central processing unit MCU respectively, touch-control drive module is connected with the touch-control handwriting pad, it is connected with LCD china ink screen to show drive module, power drive module is connected with DC5V power input module and battery respectively. The utility model discloses a set up LCD ink screen, touch-control handwriting pad and function button simultaneously, satisfy different answer modes, be provided with flash memory module simultaneously, can realize networking upload data behind the answer of disconnected net, satisfy classroom and after-class answer demand simultaneously, realize multi-functional answer, promote user experience.

Description

Intelligent answer board

Technical Field

The utility model relates to an intelligence answer board.

Background

At present, in order to improve the learning achievement of students, various developed intelligent education products mainly comprise a question answering device, a writing and answering board and the like, the functions of the products are single, the performance difference is large, the existing teaching products can only realize answering in class generally, useful information cannot be provided for teaching guidance, most of electronic products need to be watched by the students for a long time, visual fatigue is easy to occur, the eyesight is affected, and some products are developed by depending on mobile phones, pads and the like.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing an intelligence answer board, can realize networking upload data behind the answer of disconnected net, satisfies the needs of classroom interaction and class-back answer, is friendly to student's eyesight, collects multi-functionally in an organic whole.

The utility model discloses a realize like this: the utility model provides an intelligence answer board, includes central processing unit MCU, LCD wash ink screen, touch-control handwriting pad, power drive module, flash storage module, button module, status light module, wiFi drive module, touch-control drive module and LCD drive module are connected with central processing unit MCU respectively, touch-control drive module is connected with the touch-control handwriting pad, it is connected with LCD wash ink screen to show drive module, power drive module is connected with DC5V power input module and battery respectively.

Further, the chip model of the central processing unit MCU is stm32F101CBT 6.

Further, the flash memory module includes a 64M flash memory chip U3, a1 st pin of the chip U3 is connected to a 25 th pin of the MCU, a2 nd pin of the chip U3 is connected to a 16 th pin of the MCU, a 5 th pin of the chip U3 is connected to a 17 th pin of the MCU, and a 6 th pin of the chip U3 is connected to a15 th pin of the MCU. The 3 rd pin, the 7 th pin and the 8 th pin of the chip U3 are connected with a VCC power supply, the 4 th pin of the chip U3 is connected with the VCC power supply through a capacitor C16, and the 4 th pin of the chip U3 is grounded.

Further, the LCD water and ink screen is a red, black and white water and ink screen J3, the red, black and white water and ink screen J3 adopts a standard LCD display driving I2C1 interface, the 5 th pin of the J3 is grounded through a capacitor C19, the 6 th pin of the J3 is connected with the 45 th pin of the MCU, the 7 th pin of the J3 is connected with the 46 th pin of the MCU, the 9 th pin of the J3 is connected with the 22 nd pin of the MCU, the 10 th pin of the J3 is connected with the 21 st pin of the MCU, the 11 th pin of the J3 is connected with the 20 th pin of the MCU, the 12 th pin of the J3 is connected with the 19 th pin of the MCU, the 13 th pin of the J3 is connected with the 15 th pin of the MCU, the 14 th pin of the J3 is connected with the 17 th pin of the MCU, the 15 th pin and the 16 th pin of the J3 are both connected with a VCC power supply, the VCC power supply is grounded through a capacitor C29, and the 15 th pin and the 16 th pin of the J3 are both grounded.

Further, the WiFi driving module includes a WiFi communication interface JP1, a capacitor C4, a capacitor C5 and a magnetic bead FB1, a1 st pin of the WiFi communication interface JP1 is connected to a 42 th pin of the MCU, a 7 th pin of the WiFi communication interface JP1 is grounded, a2 nd pin of the WiFi communication interface JP1 is connected to one end of the magnetic bead FB1, one end of the capacitor C4 and one end of the capacitor C5, the other end of the magnetic bead FB1 is connected to the VCC power supply, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, and an 8 th pin of the WiFi communication interface JP1 is connected to a 43 th pin of the MCU.

Further, the touch driving module includes a chip U4, a capacitor C27, a capacitor C28 and a magnetic bead FB2, the chip U4 is a 12-bit high-precision analog-to-digital conversion chip, the 1 st pin of the chip U4 is connected to the 4 th pin Y1 of the interface J4 of the touch tablet, the 4 th pin of the chip U4 is connected to the 3 rd pin X2 of the interface J4 of the touch tablet, the 5 th pin of the chip U4 is connected to the 2 nd pin Y2 of the interface J4 of the touch tablet, the 16 th pin of the chip 4 is connected to the 1 st pin X1 of the interface J4 of the touch tablet, the 14 th pin of the chip U4 is connected to the 26 th pin of the MCU, the 12 th pin of the chip U4 is connected to the 27 th pin of the MCU, the 9 th pin of the chip U4 is connected to the 16 th pin of the MCU, the 8 th pin of the chip 4 is connected to the 15 th pin of the MCU 4, and the chip 17 is connected to the pin of the MCU, the 7 th pin of the chip U4 is grounded, the 15 th pin of the chip U4 is connected with one end of a magnetic bead FB2, one end of a capacitor C27 and one end of a capacitor C28 respectively, the other end of the magnetic bead FB2 is connected with a VCC power supply, and the other end of the capacitor C27 and the other end of the capacitor C28 are grounded.

Further, the status light module includes resistance R1, resistance R4, second grade luminotron D2 and second grade luminotron D3, resistance R1 one end is connected with the VCC power, and the other end is connected with second grade luminotron D2 one end, second grade luminotron D2's the other end is connected with MCU's 2 nd pin, resistance R4 one end is connected with the VCC power, and the other end is connected with second grade luminotron D3 one end, second grade luminotron D3's the other end is connected with MCU's 3 rd pin.

Further, the key module comprises an on-off key, a reset key, a confirm key, a cancel key, an up key, a down key, a key A, a key B, a key C, a key D, a key E and a key F.

The utility model has the advantages that: LCD ink screen is connected with MCU through LCD drive module, be connected touch-control handwriting pad and MCU through touch-control drive module, realize the ink screen of answer sheet and the function of touch-control, prevent that the student from using for a long time and causing the eyesight to descend, set up the answer that the button module supports the choice question simultaneously, can satisfy all question types answer operation that the student studied the needs, set up flash storage module and wiFi drive module, can realize answering storage and networking data transmission under the line, can stop the influence of other adverse circumstances, and be convenient for develop subsequent data mining work.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is the utility model relates to a structural schematic diagram of intelligence answer board.

Fig. 2 is the utility model relates to a MCU schematic structure of intelligence answer board.

Fig. 3 is the utility model relates to a flash storage module's of intelligence answer sheet circuit diagram.

Fig. 4 is the utility model relates to an ink-water screen of intelligence answer sheet and driven circuit diagram thereof.

Fig. 5 is the utility model relates to a wifi drive module's of intelligence answer sheet circuit diagram.

Fig. 6 is the utility model relates to a touch-control drive module's of intelligence answer sheet circuit diagram.

Fig. 7 is the utility model relates to a circuit diagram of status light module of intelligence answer sheet.

Fig. 8 is one of the circuit diagrams of the key module of the intelligent answer sheet of the present invention.

Fig. 9 is a second circuit diagram of the key module of the intelligent answer sheet of the present invention.

Fig. 10 is a circuit diagram of a power driving module of the intelligent answer sheet of the present invention.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the following examples.

As shown in fig. 1, the utility model discloses an intelligence answer board, including central processing unit MCU, LCD wash ink screen, touch-control handwriting pad, power drive module, flash storage module, button module, status light module, wiFi drive module, touch-control drive module and LCD drive module are connected with central processing unit MCU respectively, touch-control drive module is connected with the touch-control handwriting pad, it is connected with LCD wash ink screen to show drive module, power drive module is connected with DC5V power input module and battery respectively.

Preferably, as shown in fig. 2, the chip model of the central processing unit MCU is stm32F101CBT 6.

Preferably, as shown in fig. 3, the flash memory module includes a 64M flash memory chip U3, the 1 st pin of the chip U3 is connected to the 25 th pin of the MCU, the 2 nd pin of the chip U3 is connected to the 16 th pin of the MCU, the 5 th pin of the chip U3 is connected to the 17 th pin of the MCU, and the 6 th pin of the chip U3 is connected to the 15 th pin of the MCU. The 3 rd pin, the 7 th pin and the 8 th pin of the chip U3 are connected with a VCC power supply, the 4 th pin of the chip U3 is connected with the VCC power supply through a capacitor C16, and the 4 th pin of the chip U3 is grounded.

Preferably, as shown in fig. 4, the LCD ink screen is a red, black and white ink screen J3, the red, black and white ink screen J3 adopts a standard LCD display driver I2C1 interface, the 5 th pin of the J3 is grounded through a capacitor C19, the 6 th pin of the J3 is connected with the 45 th pin of the MCU, the 7 th pin of the J3 is connected with the 46 th pin of the MCU, the 9 th pin of the J3 is connected with the 22 nd pin of the MCU, the 10 th pin of the J3 is connected with the 21 st pin of the MCU, the 11 th pin of the J3 is connected with the 20 th pin of the MCU, the 12 th pin of the J3 is connected with the 19 th pin of the MCU, the 13 th pin of the J3 is connected with the 15 th pin of the MCU, the 14 th pin of the J3 is connected with the 17 th pin of the MCU, the 15 th pin and the 16 th pin of the J3 are both connected with a VCC power supply, the VCC power supply is grounded through a capacitor C29, and the 15 th pin and the 16 th pin of the J3 are both grounded.

Preferably, as shown in fig. 5, the WiFi driving module includes a WiFi communication interface JP1(ESP-01S), a capacitor C4, a capacitor C5 and a magnetic bead FB1, a1 st pin of the WiFi communication interface JP1 is connected to a 42 th pin of the MCU, a 7 th pin of the WiFi communication interface JP1 is grounded, a2 nd pin of the WiFi communication interface JP1 is connected to one end of the magnetic bead FB1, one end of the capacitor C4 and one end of the capacitor C5, the other end of the magnetic bead FB1 is connected to the VCC power supply, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, and an 8 th pin of the WiFi communication interface JP1 is connected to a 43 th pin of the MCU. The communication interface between the WiFi communication module of JP1 and the U1 central processor is a communication interface of UART standard. The WiFi communication module of JP1 sends data information to the U1 central processor through pin 1, and the WiFi communication module of JP1 receives data information from the U1 central processor through pin 8. WiFi drive module can realize being connected with wisdom education system, uploads data, realizes the collection of data.

Preferably, as shown in fig. 6, the touch driving module includes a chip U4, a capacitor C27, a capacitor C28 and a magnetic bead FB2, the chip U4 is a 12-bit high-precision analog-to-digital conversion chip AD7879, which can provide good driving support for the touch pad, analog-to-digital conversion is performed on the touch pad through 4 lines of chips, and the converted result is communicated with the MCU cpu by way of an SPI interface to provide touch data to the MCU cpu, the 1 st pin of the chip U4 is connected to the 4 th pin Y1 of the interface J4 of the touch pad, the 4 th pin of the chip U4 is connected to the 3 rd pin X2 of the interface J4 of the touch pad, the 5 th pin of the chip U4 is connected to the 2 nd pin Y2 of the interface J4 of the touch pad, the 16 th pin of the chip U4 is connected to the 1 st pin X1 of the interface J4 of the touch pad, and the 14 th pin of the chip U4 is connected to the first pin Y8626 of the MCU 6754, the 12 th pin of chip U4 is connected with MCU's 27 th pin, chip U4's 9 th pin is connected with MCU's 16 th pin, chip U4's 8 th pin is connected with MCU's 15 th pin, chip U4's 6 th pin is connected with MCU's 17 th pin, chip U4's 7 th pin ground connection, chip U4's 15 th pin is connected with magnetic bead FB 2's one end, electric capacity C27's one end and electric capacity C28's one end respectively, FB magnetic bead 2's the other end and VCC power are connected, electric capacity C27's the other end and electric capacity C28's the other end all ground connection.

Preferably, as shown in fig. 7, the status light module includes a resistor R1, a resistor R4, a second-stage light emitting diode D2 and a second-stage light emitting diode D3, one end of the resistor R1 is connected to the VCC POWER supply, the other end of the resistor R1 is connected to one end of the second-stage light emitting diode D2, the other end of the second-stage light emitting diode D2 is connected to the 2 nd pin of the MCU, one end of the resistor R4 is connected to the VCC POWER supply, the other end of the resistor R3 is connected to one end of the second-stage light emitting diode D3, the other end of the second-stage light emitting diode D3 is connected to the 3 rd pin of the MCU, the status light includes POWER status lights LED POWER and WiFi status lights LED WiFi, and the LED POWER lights are on when the LED POWER lights are set to be pulled down, and the LED WiFi lights are off when the LED WiFi is set to be pulled up.

Preferably, the key module comprises an on-off key, a reset key, a confirm key, a cancel key, an up key, a down key, a key A, a key B, a key C, a key D, a key E and a key F. As shown in fig. 8, the circuit diagrams of 11 function keys including an up key, a down key, an a key, a B key, a C key, a D key, an E key, an F key, an enter key, a cancel key and an on-off key are shown as K1 to K10 and S1, specifically, K1 is a key connector, one end of which is grounded, and the other end of which is connected to the 29 th pin PA8 of the MCU; k2 is a key connector, one end of which is grounded, and the other end of which is connected with the 31 st pin PA10 of the MCU; k3 is a key connector, one end of which is grounded, and the other end of which is connected with the 33 rd pin PA12 of the MCU; k4 is a key connector, one end of which is grounded, and the other end of which is connected with a 39 th pin PB3 of the MCU; k5 is a key connector, one end of which is grounded, and the other end of which is connected with a 40 th pin PB4 of the MCU; k6 is a key connector, one end of which is grounded, and the other end of which is connected with a 28 th pin PB15 of the MCU; k7 is a key connector, one end of which is grounded, and the other end of which is connected with the 30 th pin PA9 of the MCU; k8 is a key connector, one end of which is grounded, and the other end of which is connected with the 32 nd pin PA11 of the MCU; k9 is a key connector, one end of which is grounded, and the other end of which is connected with a 38 th pin PA15 of the MCU; k10 is a key connector, one end of which is grounded, and the other end of which is connected with the 41 st pin PB5 of the MCU; s1 is a key connector, one end of which is grounded and the other end is connected with the 4 th pin PC15 of the MCU; K1-K10, S1 is set as weak pull-up when the board is initialized by power-on, and triggers the falling edge interrupt when the key is pressed, corresponding to the corresponding flow operation of MCU. As shown in fig. 9, in the circuit diagram of the reset key rest, the VCC power supply is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the 7 th pin NRST of the MCU, one end of the capacitor C17 and one end of the key connector K11, the other end of the capacitor C17 and the other end of the key connector K11 are both grounded, and when K11 is pressed, the power supply is directly grounded to the MCU pin NRST through the resistor R6, thereby resetting the MCU cpu.

In addition, as shown in fig. 10, the power driving module includes a charging external interface J5, the interface J5 is an mricro USB interface, a1 st pin in the interface J5 is DC5V, a2 nd pin and a3 rd pin are respectively connected to two ends of a resistor R8, a 4 th pin, a 5 th pin and a 6 th pin are respectively grounded, wherein a F1500A self-recovery fuse is connected in the 1 st pin power input, the other end of the fuse is respectively connected to one end of a recoverable diode D1, one end of a capacitor C3, one end of a capacitor C1 and one end of a capacitor C2, and the other end of a recoverable diode D1, the other end of a capacitor C3, the other end of a capacitor C1 and the other end of a capacitor C2 are respectively grounded. A 1DC 5V line at a pin of the interface J5 is connected into a3 rd pin of a TPS563201DDCR simple easy-to-use type 3A synchronous buck conversion chip U2 after passing through a self-recovery fuse, and is connected into a 5 th pin of the chip U2 after being connected in series with a resistor R3, a 5 th pin of the U2 chip is grounded, a 4 th pin of the U2 chip is respectively connected with one end of a resistor R5 and one end of a resistor R2, the other end of the resistor R5 is grounded, the other end of the resistor R2 is connected with a CPU _1 (a voltage test point, 3.3V) and is simultaneously input with a VCC power supply, a 6 th pin of the chip U2 is connected with one end of a capacitor C6, a2 nd pin of the chip U2 is respectively connected with the other end of a capacitor C6 and one end of an inductor L1, the other end of the inductor L1 is respectively connected with the CPU _1 and the VCC power supply, one end of the capacitor C8, one end of the capacitor C465, one end of the capacitor C12 and one end of the capacitor C573, One end of the capacitor C14 and one end of the capacitor C15 are connected to a VCC power supply, and the other end of the capacitor C12, the other end of the capacitor C13, the other end of the capacitor C14, and the other end of the capacitor C15 are grounded, respectively.

The 1 st pin DC5V line of the interface J5 is connected to the 1 st pin of an SGM4056 charging control chip of a chip U5, and is also connected to one end of a capacitor C30, the other end of the capacitor C30 is grounded, the 2 nd pin of the chip U5 is connected to the 11 th pin PA1 of the MCU, the 3 rd pin of the chip U5 is connected to the 12 th pin PA2 of the MCU, the 4 th pin of the chip U5 is connected to the 13 th pin PA3 of the MCU, the 5 th pin of the chip U5 is grounded, one end of the 6 th pin resistor R9 of the U5 is connected, one end of the 7 th pin resistor R10 of the U5 is connected, the other end of the resistor R9 and the other end of the resistor R10 are both grounded, the 8 th pin of the chip U5 is connected to the anode of a battery BAT, the input end of a diode D7 of the MBR, and one end of the resistor R11, the cathode of the MBR diode D0530D 12, the other end of the resistor R599 is connected to the first pin PAO 5910, the other end of the resistor R12 is grounded.

The utility model discloses a touch-control handwriting pad adopts 12 high accuracy analog-to-digital conversion chips AD7879, realizes accurate touch-control, adopts switching regulator TPS563201DDCR to support 4.5V-7V voltage input among the power drive, can effectively protect inside chip, ensures the normal operating of intelligence answer board. The utility model discloses a set up lcd drive module, touch-control drive module is connected red black white three-colour ink-water screen and touch-control handwriting pad with MCU, realize the function of ink-water screen and the touch-control of answer board, and set up the answer that key module supported the choice question, realize that a board is multi-purpose, it realizes hard resetting to set up the rest button, make things convenient for the teacher to resume the answer board, through flash storage module and wiFi drive module, realize answer storage and networking data transmission under the line, make intelligent answer board satisfy the normal use of multiple application scene under class, as dedicated student's answer ware, can stop other application interference, also be convenient for gather student's the information of making a question, thereby provide the foundation for subsequent data mining.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims

1. An intelligent answer sheet, which is characterized in that: including central processing unit MCU, LCD china ink screen, touch-control handwriting pad, power drive module, flash memory module, button module, status light module, wiFi drive module, touch-control drive module and LCD drive module are connected with central processing unit MCU respectively, touch-control drive module is connected with the touch-control handwriting pad, LCD drive module is connected with the LCD china ink screen, power drive module is connected with DC5V power input module and battery respectively.

2. An intelligent answer sheet according to claim 1, wherein: the chip model of the central processing unit MCU is stm32F101CBT 6.

3. An intelligent answer sheet according to claim 2, wherein: the flash memory module includes 64M flash memory chip U3, chip U3's the 1 st pin is connected with MCU's 25 th pin, chip U3's the 2 nd pin is connected with MCU's the 16 th pin, chip U3's the 5 th pin is connected with MCU's the 17 th pin, chip U3's the 6 th pin is connected with MCU's the 15 th pin, chip U3's the 3 rd pin, 7 th pin and the 8 th pin are connected with the VCC power, chip U3's the 4 th pin is connected with the VCC power through a electric capacity C16, simultaneously chip U3's the 4 th pin ground connection.

4. An intelligent answer sheet according to claim 2, wherein: the LCD ink screen is a red, black and white three-color ink screen J3, the red, black and white three-color ink screen J3 adopts a standard LCD display driving I2C1 interface, the 5 th pin of the J3 is grounded through a capacitor C19, the 6 th pin of the J3 is connected with the 45 th pin of the MCU, the 7 th pin of the J3 is connected with the 46 th pin of the MCU, the 9 th pin of the J3 is connected with the 22 nd pin of the MCU, the 10 th pin of the J3 is connected with the 21 st pin of the MCU, the 11 th pin of the J3 is connected with the 20 th pin of the MCU, the 12 th pin of the J3 is connected with the 19 th pin of the MCU, the 13 th pin of the J3 is connected with the 15 th pin of the MCU, the 14 th pin of the J3 is connected with the 17 th pin of the MCU, the 15 th pin and the 16 th pin of the J3 are both connected with a VCC power supply, the VCC power supply is grounded through a capacitor C29, and the 15 th pin and the 16 th pin of the J3 are both grounded.

5. An intelligent answer sheet according to claim 2, wherein: the WiFi driving module comprises a WiFi communication interface JP1, a capacitor C4, a capacitor C5 and a magnetic bead FB1, wherein a1 st pin of the WiFi communication interface JP1 is connected with a 42 th pin of the MCU, a 7 th pin of the WiFi communication interface JP1 is grounded, a2 nd pin of the WiFi communication interface JP1 is respectively connected with one end of the magnetic bead FB1, one end of the capacitor C4 and one end of the capacitor C5, the other end of the magnetic bead FB1 is connected with a VCC power supply, the other end of the capacitor C4 and the other end of the capacitor C5 are respectively grounded, and an 8 th pin of the WiFi communication interface JP1 is connected with a 43 th pin of the MCU.

6. An intelligent answer sheet according to claim 2, wherein: the touch driving module comprises a chip U4, a capacitor C27, a capacitor C28 and a magnetic bead FB2, wherein the chip U4 is a 12-bit high-precision analog-to-digital conversion chip, a1 st pin of the chip U4 is connected with a 4 th pin Y1 of an interface J4 of a touch writing pad, a 4 th pin of the chip U4 is connected with a3 rd pin X2 of an interface J4 of the touch writing pad, a 5 th pin of the chip U4 is connected with a2 nd pin Y2 of the interface J4 of the touch writing pad, a 16 th pin of the chip U4 is connected with a1 st pin X1 of an interface J4 of the touch writing pad, a 14 th pin of the chip U4 is connected with a 26 th pin of an MCU, a12 th pin of the chip U4 is connected with a 27 th pin of the MCU, a9 th pin of the chip U4 is connected with a 16 th pin of the MCU, an 8 th pin of the chip U4 is connected with a15 th pin of the MCU 67 4, and a fourth pin of the chip U3517, the 7 th pin of the chip U4 is grounded, the 15 th pin of the chip U4 is connected with one end of a magnetic bead FB2, one end of a capacitor C27 and one end of a capacitor C28 respectively, the other end of the magnetic bead FB2 is connected with a VCC power supply, and the other end of the capacitor C27 and the other end of the capacitor C28 are grounded.

7. An intelligent answer sheet according to claim 2, wherein: the state lamp module includes resistance R1, resistance R4, second grade luminotron D2 and second grade luminotron D3, resistance R1 one end is connected with the VCC power, and the other end is connected with second grade luminotron D2 one end, second grade luminotron D2's the other end is connected with MCU's 2 nd pin, resistance R4 one end is connected with the VCC power, and the other end is connected with second grade luminotron D3 one end, second grade luminotron D3's the other end is connected with MCU's 3 rd pin.

8. An intelligent answer sheet according to claim 1, wherein: the key module comprises an on-off key, a reset key, a confirmation key, a cancel key, an up key, a down key, a key A, a key B, a key C, a key D, a key E and a key F.