CN206601692U - A kind of electric whiteboard system based on ARM - Google Patents

Abstract

The utility model discloses a kind of electric whiteboard system based on ARM, including signal emission module, signal acquisition module and signal processing module, the signal emission module is arranged in sign pen, produce infrared signal and ultrasonic signal, the signal acquisition module is set in signal receiver on a display panel, gather the infrared signal and ultrasonic signal produced by the signal emission module, the signal processing module is integrally disposed in an arm processor, the arm processor is connected by a controller with the signal receiver, the arm processor receive and handle infrared signal and ultrasonic signal after, presented on said display panel by a projector.The utility model can it is efficient, light, economically realize electronic whiteboard function, can preferably apply to learn, work and stress-relieving activity.

Description

An electronic whiteboard system based on ARM

technical field

The utility model relates to the technical field of computer education application, in particular to an ARM-based electronic whiteboard system.

Background technique

The development of educational informatization has also brought new challenges to our daily class mode. In the teaching classroom, more and more attention is paid to the interaction between teachers and students and the richness and variety of content. The traditional teaching mode of blackboard and chalk can no longer meet this demand. . At present, the commonly used solutions in multimedia classrooms are projectors, physical booths, computers, etc. Although they can conveniently integrate rich and colorful teaching content such as physical objects, computer teaching courseware, video, audio, etc. The blackboard writing has some conflicts. The equipment used in multimedia teaching, such as projection screens, etc., teachers cannot directly write and annotate on them, and teachers need to switch frequently between the computer console and the blackboard, which brings great inconvenience to the teacher's teaching. Until recent years, the emergence of products such as electronic whiteboards has gradually solved this problem.

The electronic whiteboard has the basic functions of a blackboard, can write on the blackboard freely, and can write text and hand-drawn graphics on the board in real time; on the other hand, the electronic whiteboard can conveniently display, process and store various digital teaching materials, thus enriching the teaching Content. And you can save the content of the current blackboard writing with files in various formats at any time, and file it in the computer for reuse in the next class or for students to review after class.

Utility model content

The purpose of the utility model is to provide an electronic whiteboard system based on ARM, which can realize the function of the electronic whiteboard efficiently, conveniently and economically, and can be better used in study, work and leisure activities.

In order to achieve the above purpose, specifically, the utility model provides the following technical solutions:

An electronic whiteboard system based on ARM, including a signal transmitting module, a signal collecting module and a signal processing module, the signal transmitting module is arranged in a signal pen to generate infrared signals and ultrasonic signals, and the signal collecting module is arranged on a display panel In the signal receiver, the infrared signal and the ultrasonic signal generated by the signal transmitting module are collected, and the signal processing module is integrated in an ARM processor, and the ARM processor communicates with the signal receiver through a controller connected, the ARM processor receives and processes the infrared signal and the ultrasonic signal, and presents them on the display panel through a projector.

Further, the signal transmitting module includes a signal generating circuit, a driving circuit, an ultrasonic emitting sensor and an infrared emitting sensor, and the signal generating circuit controls the periodic generation of the ultrasonic emitting sensor and the infrared emitting sensor through the driving circuit. Infrared signal and ultrasonic signal.

Further, the signal acquisition module includes a multi-stage amplification circuit, a shaping circuit and a DSP processor, the ultrasonic signal includes a left ultrasonic signal and a right ultrasonic signal, and the left ultrasonic signal and the right ultrasonic signal are respectively After being processed by the multi-stage amplifying circuit and the shaping circuit, it is sent to the DSP processor, and the DSP processor delays and extracts the left-channel ultrasonic signal and the right-channel ultrasonic signal and then transmits it to the A signal processing module; the infrared signal is transmitted to the DSP processor after passing through the shaping circuit, and the DSP processor performs delayed extraction on the infrared signal and then transmits it to the signal processing module.

Further, the signal processing module includes an ARM processor, a power supply and its reset circuit, an SM501 display circuit, an audio unit, a clock unit, and a network card unit; the power supply and its reset circuit, the SM501 display circuit, and the audio unit , the clock unit and the network card unit are electrically connected to the ARM processor, and the ARM processor receives the delayed ultrasonic signal and infrared signal of the information acquisition module through a main USB interface; through the SM501 circuit, it is displayed in real time In an LCD display, the LCD display is arranged in a display panel.

Further, the signal processing module further includes SDRAM, Nand Flash, and a slave USB interface, and the SDRAM, the Nand Flash, and the slave USB interface are electrically connected to the ARM processor.

The utility model method has the following advantages:

The electronic whiteboard system of the utility model adopts the ARM processor as the core device, integrates multiple functions such as data storage, network communication, audio, and video playback, and can realize the electronic whiteboard function efficiently, conveniently and economically, and can better Used in study, work and leisure activities.

Description of drawings

Fig. 1 is a block diagram of the structure module of the electronic whiteboard system of the present utility model.

Fig. 2 is a schematic diagram of the composition and structure of the electronic whiteboard system of the present invention.

Fig. 3 is a structural block diagram of the signal transmitting module in the electronic whiteboard system of the present invention.

Fig. 4 is a structural block diagram of the signal acquisition module in the electronic whiteboard system of the present invention.

Fig. 5 is a structural block diagram of the signal processing module in the electronic whiteboard system of the present invention.

Fig. 6 is a schematic diagram of the positioning principle of the electronic whiteboard system of the present invention.

Among them, 10-display panel, 20-projector, 30-ARM processor, 40-controller, 50-signal pen, 60-signal receiver.

detailed description

The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

Example 1

As shown in Figures 1 and 2, an ARM-based electronic whiteboard system includes a signal transmitting module, a signal acquisition module, and a signal processing module. The signal transmitting module is arranged in the signal pen 50 to generate infrared signals and ultrasonic signals. The signal acquisition module is arranged in the signal receiver 60 on the display panel 10 to collect the infrared signal and the ultrasonic signal generated by the signal transmission module, and the signal processing module is integrated in an ARM processor 30, and the ARM The processor 30 is connected to the signal receiver 60 through a controller 40 , and the ARM processor 30 receives and processes the infrared signal and the ultrasonic signal, and presents them on the display panel 10 through a projector.

Further, the signal transmitting module includes a signal generating circuit, a driving circuit, an ultrasonic emitting sensor and an infrared emitting sensor, and the signal generating circuit controls the periodic generation of the ultrasonic emitting sensor and the infrared emitting sensor through the driving circuit. Infrared signal and ultrasonic signal.

As shown in Figure 3, the signal transmitting module is set in the signal pen. When writing, the pressure between the pen tip and the writing board turns on the power in the pen; the signal pen starts to emit ultrasonic and infrared signals with a cycle of 17ms. When the writing is stopped, the nib is disconnected from the writing board, the power supply in the pen is disconnected, and the signal pen stops working.

As shown in Figure 4, the signal acquisition module includes a multistage amplifying circuit, a shaping circuit and a DSP processor, the ultrasonic signal includes a left ultrasonic signal and a right ultrasonic signal, and the left ultrasonic signal and the right ultrasonic signal The ultrasonic signals are respectively processed by the multi-stage amplifying circuit and the shaping circuit and then sent to the DSP processor, and the DSP processor delays and extracts the left-channel ultrasonic signal and the right-channel ultrasonic signal before transmitting to the signal processing module; the infrared signal is transmitted to the DSP processor after passing through the shaping circuit, and the DSP processor delays and extracts the infrared signal and then transmits it to the signal processing module.

As shown in Figure 5, the signal processing module includes an ARM processor, a power supply and a reset circuit thereof, an SM501 display circuit, an audio unit, a clock unit and a network card unit; the power supply and a reset circuit thereof, the SM501 display circuit, the The audio unit, the clock unit and the network card unit are electrically connected to the ARM processor, and the ARM processor receives an information acquisition module delay ultrasonic signal and an infrared signal through a main USB interface; through the SM501 circuit The real-time display is on the LCD display, which is set in the display panel.

Wherein, the signal processing module further includes SDRAM, Nand Flash, and a slave USB interface, and the SDRAM, the Nand Flash, and the slave USB interface are electrically connected to the ARM processor.

The transmission speed of infrared signals in the air is the speed of light, and the transmission speed of ultrasonic signals in air is 340 m/s. Compared with ultrasonic signals, the time required for infrared transmission within the range of whiteboards can be ignored, so infrared The signal is used as a reference signal, and the position of the writing pen can be precisely positioned by calculating the time required for the ultrasonic signal to travel from the signal pen to the ultrasonic signal receiver.

Wherein, the ARM processor is the S3C2440X produced by South Korea's Samsung Company, which adopts the 16/32-bit ARM920T processor core of the ARM Company, and has a maximum operating frequency of 533MHZ. The S3C2440X is composed of three parts: ARMTDMI, memory management unit (MMU) and cache , where the MMU is used to manage virtual memory, and the cache consists of a 16KB instruction Cache and a 16KB data Cached. There are also two internal coprocessors: CP14 and CP15, CP14 is used for debugging control, CP15 is used for storage system control and test control.

As shown in Figure 6, the signal pen emits an infrared signal, and the signal acquisition module is responsible for collecting the time required for the ultrasonic signal from the signal pen to the ultrasonic receiving sensor (the infrared signal is used as the reference time for ultrasonic signal timing, when the infrared signal reaches the receiving sensor, Ultrasonic sensor starts timing), which is composed of left receiving sensor A, right receiving sensor B and DSP processor located in the upper left corner of the display panel of the electronic whiteboard. The distance between the two ultrasonic receivers is a fixed value D, and the left receiver A receives The signal sent by the signal pen is used to measure the distance between the signal pen P and the ultrasonic receiver A, and the right ultrasonic receiver B receives the signal sent by the signal pen to measure the distance between the signal pen P and the receiver B. And processed by the DSP processor into delayed data, plus the color of the signal pen and the information of lifting and lowering the pen and sending it to the ARM processor.

Although the utility model has been described in detail with general description and specific examples above, some modifications or improvements can be made on the basis of the utility model, which will be obvious to those skilled in the art. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the utility model all belong to the protection scope of the utility model.

Claims (5)

1. a kind of electric whiteboard system based on ARM, it is characterised in that：Including signal emission module, signal acquisition module and Signal processing module, the signal emission module is arranged in sign pen, produces infrared signal and ultrasonic signal, and the signal is adopted Collect module to set in signal receiver on a display panel, gather infrared signal produced by the signal emission module and super Acoustical signal, the signal processing module is integrally disposed in an arm processor, and the arm processor passes through a controller and institute State signal receiver connection, the arm processor receive and handle infrared signal and ultrasonic signal after, by a projector in institute State and presented on display panel.

2. a kind of electric whiteboard system based on ARM according to claim 1, it is characterised in that：The signal launches mould Block includes signal generating circuit, drive circuit and ultrasonic wave emission sensor and infrared emitting sensor, the signal production Raw circuit controls the ultrasonic wave emission sensor and the infrared emitting cycle sensor by the drive circuit Produce infrared signal and ultrasonic signal.

3. a kind of electric whiteboard system based on ARM according to claim 1, it is characterised in that：The signal acquisition mould Block includes multistage amplifier circuit, shaping circuit and DSP Processor, and the ultrasonic signal includes left ultrasonic signal and right wing is super Acoustical signal, the left ultrasonic signal and the right wing ultrasonic signal pass through the multistage amplifier circuit, shaping electricity respectively The DSP Processor is sent to after the processing of road, the DSP Processor is to the left ultrasonic signal and the right wing ultrasonic signal Enter after line delay is extracted and be sent to the signal processing module；The infrared signal is described by being sent to after the shaping circuit DSP Processor, the DSP Processor, which enters to the infrared signal after line delay is extracted, is sent to the signal processing module.

4. a kind of electric whiteboard system based on ARM according to claim 1, it is characterised in that：The signal transacting mould Block includes arm processor, power supply and its reset circuit, SM501 display circuits, audio unit, clock unit and network interface card unit； The power supply and its reset circuit, the SM501 display circuits, the audio unit, the clock unit and the network interface card list First to be electrically connected with the arm processor, the arm processor is delayed super by a main USB interface receive information acquisition module Acoustical signal and infrared signal；By SM501 circuits display in real time, in a lcd display, the LCD display is arranged on aobvious Show in panel.

5. a kind of electric whiteboard system based on ARM according to claim 4, it is characterised in that：The signal transacting mould Block also includes SDRAM, Nand Flash, from USB interface, the SDRAM, the Nand Flash, described from USB interface and institute State arm processor electric connection.