Interphone for STEM education demonstration

Abstract

The invention provides an interphone for STEM education demonstration, which is characterized in that the interphone comprises two circular handle heads, two circular handle head cover plates and a battery box, the two circular handle heads are buckled together to form a circular space, and a loudspeaker module, a power management module, a key module and a radio frequency transceiver module are arranged in the circular space; a groove is formed between the two circular handle heads, and the battery box is inserted into the groove; the circular handle head cover plates are installed on the edges of the two circular handle heads through screws respectively. The power management module is used for providing power for the radio frequency transceiver module; and the key module is used for switching the transmitting mode and the receiving mode of the interphone. According to the technical scheme provided by the invention, FM / ASK modulation and demodulation are adopted, the anti-interference capability is strong, the signal transmission is stable, and a long-distance talkback call function can be realized.

Description

Technical Field

[0001] This document relates to the field of intercom technology, and more particularly to an intercom for STEM education presentations. Background Art

[0002] In recent years, STEM education has received widespread attention and development around the world. STEM education is an educational concept that focuses on interdisciplinary, practical, innovative and situational aspects, and aims to cultivate talents with STEM literacy. With the development of science and technology, walkie-talkies are needed for teaching in the process of STEM education demonstrations. Traditional walkie-talkies are large in size, complex in operation, and high in cost, making them difficult to be directly applied to teaching aids and toys. Existing toy walkie-talkies mostly use analog signals to achieve sound transmission, with poor signal quality, short intercom distance, and are easily interfered by the surrounding environment, resulting in a very poor experience.

[0003] Traditional commercial walkie-talkies are difficult to be directly applied to teaching aids and toys due to their large size, complicated operation, and high cost. Existing toy walkie-talkies mostly use coils to receive wireless signals, amplify the signals through transistors, and then drive speakers to make sounds. This method uses analog signals to achieve sound transmission. This method has poor signal quality, short intercom distance, and is easily interfered by the surrounding environment.

[0004] Therefore, it is necessary to provide a highly integrated, low-power, and easily programmable intercom. Summary of the invention

[0005] The present invention provides an intercom for STEM education demonstration, aiming to solve the above problems.

[0006] According to an embodiment of the present invention, there is provided an intercom for STEM education demonstration, comprising:

[0007] Two circular handle heads, two circular handle head covers and a battery box, the two circular handle heads are buckled together to form a circular space, the circular space is provided with a speaker module, a power management module, a button module and a radio frequency transceiver module; a groove is provided between the two circular handle heads, the battery box is inserted into the groove;

[0008] The circular handle head cover plates are respectively installed on the edges of the two circular handle heads using screws;

[0009] The power management module is used to provide power to the radio frequency transceiver module;

[0010] The button module is used to switch the transmitting and receiving modes of the intercom.

[0011] The intercom for STEM education demonstration provided by the embodiment of the present invention can be used for teaching demonstration, and can also be used as a toy that can talk over long distances. The BK4802N chip is used to achieve low cost and high communication efficiency. The intercom uses an external key module for sending and receiving switching; 3PIN lines are used to connect the modules; FM / ASK modulation is used for sending and receiving signals. It has the characteristics of high integration, low power consumption, easy programming, etc., and provides a solid foundation for the development of miniaturized and digital DIY intercoms. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a structural schematic diagram of an intercom for STEM education demonstration according to an embodiment of the present invention;

[0014] Figure 2 is a circuit diagram of a chip U1 according to an embodiment of the present invention;

[0015] Figure 3 is a circuit diagram of a chip U2 according to an embodiment of the present invention;

[0016] Figure 4 A circuit diagram of a P2 interface connected to a key module according to an embodiment of the present invention;

[0017] Figure 5 is a circuit diagram of the antenna interface E1 according to an embodiment of the present invention;

[0018] Figure 6 is a schematic diagram of a radio frequency transceiver module according to an embodiment of the present invention;

[0019] Description of the drawings: 1-battery box, 2-round handle head, 3-speaker module, 4-round handle head cover seat, 5-power management module, 6-RF transceiver module, 7-button module. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will be combined with the drawings in one or more embodiments of this specification to clearly and completely describe the technical solutions in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0021] According to an embodiment of the present invention, a walkie-talkie for STEM education demonstration is provided. Figure 1 FIG. 1 is a schematic diagram of the structure of an intercom for STEM education demonstration according to an embodiment of the present invention. Figure 1 As shown, the intercom for STEM education demonstration according to the embodiment of the present invention specifically includes:

[0022] Two circular handle heads 2, two circular handle head covers 4 and a battery box 1, the two circular handle heads 2 are buckled together to form a circular space, and a speaker module 3, a power management module 5, a button module 7 and a radio frequency transceiver module 6 are arranged in the circular space; a groove is arranged between the two circular handle heads 2, and the battery box 1 is inserted into the groove;

[0023] The circular handle head cover plate 4 is respectively installed on the edges of the two circular handle heads 2 using screws;

[0024] The power management module 5 is used to provide power to the radio frequency transceiver module 6;

[0025] The button module 7 is used to switch the transmission and reception modes of the intercom.

[0026] The RF transceiver module 6 specifically includes: a RF transceiver chip, an antenna, a microphone, a power interface, a button interface and a speaker interface;

[0027] The RF transceiver chip has built-in RF switch, low noise amplifier, mixer, intermediate frequency amplifier / filter, analog-to-digital converter, FM / ASK demodulation, frequency synthesizer, RF power amplifier, microphone amplifier, and audio power amplifier;

[0028] The radio frequency switch is used to complete the path switching of the radio frequency signal according to the transmission and reception mode of the intercom;

[0029] The low noise amplifier is used to amplify the radio frequency signal;

[0030] The frequency synthesizer is used to generate a local oscillator signal;

[0031] The mixer is used to mix the amplified radio frequency signal with the local oscillator signal to generate an intermediate frequency signal;

[0032] An intermediate frequency amplifier / filter, used to amplify and filter the intermediate frequency signal;

[0033] The analog-to-digital converter is used to convert the analog signal into a digital signal;

[0034] The FM / ASK demodulation is used to provide two signal demodulation modes: frequency modulation and amplitude keying;

[0035] The radio frequency power amplifier is used to amplify the power of the radio frequency signal;

[0036] The microphone amplifier is used to amplify the audio signal output by the microphone;

[0037] The audio power amplifier is used to drive the speaker module to produce sound;

[0038] The antenna receives the FM / ASK demodulated audio signal in the receiving mode, and sends the FM / ASK demodulated audio signal output by the microphone in the transmitting mode;

[0039] A power interface, used to connect to the power management module;

[0040] A button interface, used for connecting with the button module;

[0041] The speaker interface is used to connect to the speaker module.

[0042] The radio frequency transceiver chip adopts CMOS technology, operates in the frequency band of 19MHz to 530MHz, has half-duplex transceiver capability, and supports FM / ASK modulation and demodulation modes.

[0043] The battery box is in the shape of a rectangular parallelepiped, and contains three No. 7 batteries with an output voltage of 4.5V.

[0044] The two circular handle heads are fixed to the battery box via screws and nuts.

[0045] The power management module is connected to the power interface of the radio frequency transceiver chip via a 3PIN line.

[0046] The output interface of the key module is connected to the key interface of the radio frequency transceiver chip through a 3PIN line.

[0047] The speaker module is connected to the speaker interface of the radio frequency transceiver chip through a 3PIN interface.

[0048] The two circular handle heads, the two circular handle head cover plates and the battery box are all made by injection molding technology.

[0049] according to Figure 1 It can be seen that the two circular handle heads 2 of the embodiment of the present invention are buckled together, the battery box 1 is inserted into the groove between the two circular handle heads and fixed by screws and nuts, the speaker module 3 and the power management module 5 are installed on the front of the circular handle heads with screws, the button module 7 and the RF transceiver module 6 are installed on the back of the circular handle heads with screws, and the circular handle head cover plate 4 is installed on the edges of the two circular handle heads with screws. The power output interface of the battery box is connected to the input interface on the side of the power management module through a 3PIN line, the 5V output interface of the power management module is connected to the power interface of the RF transceiver module through a 3PIN line, the output interface of the button module is connected to the button interface on the side of the RF transceiver module through a 3PIN line, and the speaker is connected to the speaker interface of the RF transceiver module through a 3PIN interface.

[0050] The radio frequency transceiver chip in the embodiment of the present invention adopts the BK4802 chip, and the BK4802N chip is responsible for the modulation and demodulation of the signal, channel selection, power control and other functions, realizing low-cost and high-efficiency digital communication functions. The chip supports the 19MHz to 530MHz frequency band, has half-duplex transceiver capability, supports FM / ASK modulation and demodulation mode and multiple advanced functions. With its high integration, low power consumption, easy programming and other characteristics, it provides a solid foundation for the development of miniaturized and digital DIY walkie-talkies.

[0051] Figure 2-Figure 6 is a circuit diagram of an embodiment of the present invention, according to Figure 2-Figure 6 It can be seen that the 4.5V power supply is input from the P3 interface, and after being stepped down to 3.3V by U2, it powers the chip BK4802 and lights up the power indicator D2. E1 is the antenna interface, and the P2 interface is connected to a button module to switch the transmission and reception modes. When the external button is pressed, the intercom is in the transmission mode, and the sound is converted into an electrical signal through the microphone MK1 and transmitted to the chip U1. U1 samples the signal and then modulates it through FM / ASK. The modulated signal is sent out from the ANT pin and sent out from the antenna E1 through the LC resonant circuit. When the button is released, the intercom is in the reception mode. When the external button is released, the FM / ASK modulated signal received by the antenna is selected by the LC resonant circuit and input to the chip U1 through the ANT pin. The chip demodulates the signal to obtain the sound sampling data, and then U1 drives the speaker connected to the P1 interface to make a sound based on the sampling data.

[0052] The power supply voltage of this solution is only 4.5V, which is a safe voltage specified in the national standard. The walkie-talkie's receiving and transmitting modes are switched by pressing a button. The walkie-talkie's transmitting and receiving signals use FM / ASK modulation and demodulation, which has strong anti-interference ability and stable signal transmission, and can realize long-distance intercom call function.

[0053] By adopting the embodiments of the present invention, the following beneficial effects are achieved:

[0054] The walkie-talkie for STEM education demonstration provided by the embodiment of the present invention can be used for teaching demonstration, and can also be used as a toy that can talk over long distances. The BK4802N chip is used to achieve low cost and high communication efficiency. The walkie-talkie uses an external key module for sending and receiving switching; 3PIN lines are used to connect the modules; FM / ASK modulation is used for sending and receiving signals. It has the characteristics of high integration, low power consumption, easy programming, etc., and provides a solid foundation for the development of miniaturized and digital DIY walkie-talkies.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A walkie-talkie for STEM education demonstration, characterized in that include: Two circular handle heads, two circular handle head covers and a battery box, the two circular handle heads are buckled together to form a circular space, the circular space is provided with a speaker module, a power management module, a button module and a radio frequency transceiver module; a groove is provided between the two circular handle heads, the battery box is inserted into the groove; The circular handle head cover plates are respectively installed on the edges of the two circular handle heads using screws; The power management module is used to provide power to the radio frequency transceiver module; The button module is used to switch the transmitting and receiving modes of the intercom.

2. The intercom for STEM education demonstration according to claim 1, characterized in that: The radio frequency transceiver module specifically includes: a radio frequency transceiver chip, an antenna, a microphone, a power interface, a button interface and a speaker interface; The RF transceiver chip works in a transmitting and receiving mode. When working in the transmitting mode, it is used to send the audio signal received by the microphone through the antenna. When working in the receiving mode, it is used to send the audio signal received by the antenna through the speaker module. The antenna receives the FM / ASK demodulated audio signal in the receiving mode, and sends the FM / ASK demodulated audio signal output by the microphone in the transmitting mode; The power interface is connected to the power management module; The key interface is connected to the key module; The speaker interface is connected to the speaker module.

3. The intercom for STEM education demonstration according to claim 2, characterized in that: The radio frequency transceiver chip adopts CMOS technology.

4. The intercom for STEM education demonstration according to claim 2, characterized in that: The RF transceiver chip operates in the 19MHz to 530MHz frequency band, has half-duplex transceiver capability, and supports FM / ASK modulation and demodulation modes.

5. The intercom for STEM education demonstration according to claim 1, characterized in that: The battery box is in the shape of a rectangular parallelepiped, and contains three No. 7 batteries with an output voltage of 4.5V.

6. The intercom for STEM education demonstration according to claim 1, characterized in that: The two circular handle heads are fixed to the battery box via screws and nuts.

7. The intercom for STEM education demonstration according to claim 2, characterized in that: The power management module is connected to the power interface of the radio frequency transceiver module via a 3PIN line.

8. The intercom for STEM education demonstration according to claim 2, characterized in that: The output interface of the key module is connected to the key interface of the radio frequency transceiver module through a 3PIN line.

9. The intercom for STEM education demonstration according to claim 2, characterized in that: The speaker module is connected to the speaker interface of the radio frequency transceiver module through a 3PIN interface.

10. The intercom for STEM education demonstration according to claim 1, characterized in that: The two circular handle heads, the two circular handle head cover plates and the battery box are all made by injection molding technology.

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