CN204496905U - A kind of without keying electronic upright piano - Google Patents
A kind of without keying electronic upright piano Download PDFInfo
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- CN204496905U CN204496905U CN201520123846.4U CN201520123846U CN204496905U CN 204496905 U CN204496905 U CN 204496905U CN 201520123846 U CN201520123846 U CN 201520123846U CN 204496905 U CN204496905 U CN 204496905U
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- main control
- control chip
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- upright piano
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Abstract
The utility model discloses a kind of without keying electronic upright piano, its object is to provide a kind of low cost, by force recreational, the single-chip microcomputer of stable performance is without keying electronic upright piano, user just can carry out freely playing without the need to using button, playing effect is dazzled extremely, and music playing can be learnt according to the scale pilot lamp in the music play and listen to the song be recorded in advance in single-chip microcomputer, described upright piano comprises mainboard, described mainboard comprises main control chip, described main control chip is connected with the infrared human body induction module being positioned at described mainboard front end, the hummer of described main control chip side and the LED running lamp of described mainboard rear end, described main control chip is by quartz crystal oscillator additional electric capacity construction system clock circuit, for described main control chip provides external clock, described main control chip is also connected with the audio interface be positioned on described mainboard, described main control chip is connected with USB interface by a CH340 chip, communicate for system power supply or by described CH340 chip with described main control chip.
Description
Technical field
The utility model relates to toy for children field, particularly relates to a kind of without keying electronic upright piano.
Background technology
Existing Toy electronics upright piano has reached higher level on playing effect and product amusement function, but performance is all undertaken playing by fixing button, inadequate freedom and flexibility, and the fragile control circuit of complexity that needs of button realizes, cost of products is remained high, is unfavorable for the development of the marketization.Meanwhile, the outward appearance of the electronics upright piano of current toys and man-machine interaction also need new element injection badly wherein, no matter be commercially that key indicator lamp designs or button design all exists larger deficiency.
Summary of the invention
For these drawbacks of existing electronics upright piano, the purpose of this utility model be to develop a kind of low cost, recreational strong, stable performance single-chip microcomputer without keying electronic upright piano, user just can carry out freely playing without the need to using button, playing effect is dazzled extremely, and can learn music playing according to the scale pilot lamp in the music play and listen to the song be recorded in advance in single-chip microcomputer.
To achieve these objectives, the utility model is a kind of without keying electronic upright piano, described upright piano comprises mainboard, described mainboard comprises main control chip, described main control chip is connected with the infrared human body induction module being positioned at described mainboard front end, the hummer of described main control chip side and the LED running lamp of described mainboard rear end, described main control chip is by quartz crystal oscillator additional electric capacity construction system clock circuit, for described main control chip provides external clock, described main control chip is also connected with the audio interface be positioned on described mainboard, described main control chip is connected with USB interface by a CH340 chip, communicate for system power supply or by described CH340 chip with described main control chip.
Wherein said main control chip is STC89C51 single-chip microcomputer.
Wherein said LED running lamp is the pilot lamp of corresponding 7 the infrared human body sensors of light emitting diode as scale that row have red, green, yellow three kinds of colors.
Wherein said electric capacity is two 33P electric capacity.
Wherein said infrared human body induction module comprises pyroelectric infrared human body sensor.
The utility model forms primarily of main control chip peripheral circuit, power module, infrared human body induction module, data memory module, pilot lamp drive control module, passive hummer drive control module, USB serial communication modular without keying electronic upright piano.Adopt STC89C51 as main control chip, one row have corresponding 7 the pyroelectric infrared human body sensors of light emitting diode of red, green, yellow three kinds of colors as scale pilot lamp, utilize the human body infrared signal that pyroelectric infrared human body sensor collects, drive hummer and running lamp carry out scale performance and show current played scale position by AD conversion.Consider that the infrared radiation scope of human body integral is larger, pyroelectric infrared sensor induction range is also more extensive, so regulate the induction range of sensor by controlling corresponding hardware circuit, and induction range being contracted on system board, realizing the accurate induction to each finger.In system work process, user can utilize audio interface realization audio amplifier synchronously to play played music, or by music that single-chip microcomputer in earphone listening system records.
The utility model compared with prior art has following advantage: (1) the utility model adopts STC89C51 single-chip microcomputer as main control chip, use the method that timer internal calculates, accurately realize the accurate conversion to each scale frequency, compared with the mellotron on market, the accuracy of scale, tone color greatly increases, the music type that can play is more, and content is also abundanter.
(2) the utility model adopts pyroelectric infrared human body sensor, replace machine-made button in the past, this sensor sensing is accurate, long service life, without the need to finger touching so spoilage is low, compensate for the flimsy weak point of button, simultaneously compared with button, cost of manufacture is lower, packs without the need to plastic casing.
(3) the utility model uses gorgeous colorful running lamp as pilot lamp, along with flickering effect of quivering appears in playing of scale.
(4) the utility model adopts passive hummer as music player, and the level utilizing the height needed for its drive principle alternately constantly to change strengthens the sounding effect of scale, and the scale sound of generation is melodious clear and melodious, ensure that the melody playing out is undistorted.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model without keying electronic upright piano;
Fig. 2 is that the utility model is without keying electronic upright piano workflow block diagram;
Fig. 3 is the circuit diagram of the utility model without the infrared human body sensor of keying electronic upright piano;
Fig. 4 is that the utility model is without keying electronic upright piano LED running lamp and hummer control circuit figure.
Description of reference numerals: 101-pyroelectric infrared human body sensor, 102-quartz crystal oscillator, 103-STC89C51 single-chip microcomputer, the passive hummer of 104-, 105-mainboard, 106-audio interface, 107-LED running lamp, 108-CH340 chip, 109-USB interface.
Embodiment
Below in conjunction with drawings and Examples, to above-mentioned being described in more detail with other technical characteristic and advantage of the utility model.
As Figure 1-4, the utility model is a kind of without keying electronic upright piano, described upright piano comprises mainboard 105, mainboard 105 comprises employing STC89C51 single-chip microcomputer 103 as main control chip, described main control chip is connected with the pyroelectric infrared human body sensor 101 being positioned at mainboard 105 front end, the passive hummer 104 of described main control chip side and the LED running lamp 107 of mainboard 105 rear end, described main control chip is by additional two the electric capacity construction system clock circuits of quartz crystal oscillator 102, for described main control chip provides external clock, described main control chip is also connected with the audio interface 106 be positioned on mainboard 105, described main control chip is connected with usb 1 09 by a CH340 chip 108, communicate for system power supply or by CH340 chip 108 with described main control chip.
As shown in Figure 1, the optical filter sensitive surface of pyroelectric infrared human body sensor 101 to be vertically positioned on mainboard 105 and firm welding, by the infrared human body sensor circuit in Fig. 3, induction range is narrowed down on mainboard 105, be convenient to finger be positioned over mainboard 105 carries out playing and be unlikely to point unsettled easy generation sense of fatigue.Additional two the 33P electric capacity construction system clock circuits of quartz crystal oscillator 102, for main control singlechip 103 provides external clock, ensure that the normal work of single-chip microcomputer.As shown in Figure 2, pyroelectric infrared human body sensor 101 by the infrared signal that collects after Chip Microcomputer A/D conversion, the scale frequency codes that single-chip microcomputer is stored by the binary code that the mode of scanning obtains current infrared human body sensor according to level signal in data-carrier store, then drive hummer 104 to send the sound by timer internal and external interrupt, the LED running lamp 107 simultaneously has also been lit.Buzzer drive circuit as shown in Figure 4, sends the clear and melodious scale sound after the level replaced by height is amplified by triode.
Audio interface 106 is mainly used for expansion earphone and listens to the function of music and carry out the function of music with public address equipments such as audio amplifiers.Usb 1 09 is common USB interface, as long as the USB data line of a smart mobile phone just can by CH340 chip 108 to system power supply or utilize PC to carry out download online.Also+5V voltage can be provided to be that main control chip STC89C51 and related device are powered by power module mu balanced circuit.In addition, user can play by the infrared sensor triggering music playing function the music recorded in advance in single-chip microcomputer.USB data line can be utilized in system work process to realize the communication of PC machine and microcontroller serial port, realized the replacement of information in data-carrier store by IAP online programming.
The utility model is without low, recreational strong, the stable performance of keying electronic upright piano cost, user just can carry out freely playing without the need to using button, playing effect is dazzled extremely, and can learn music playing according to the scale pilot lamp in the music play and listen to the song be recorded in advance in single-chip microcomputer.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (5)
1. one kind without keying electronic upright piano, it is characterized in that: described upright piano comprises mainboard, described mainboard comprises main control chip, described main control chip is connected with the infrared human body induction module being positioned at described mainboard front end, the hummer of described main control chip side and the LED running lamp of described mainboard rear end, described main control chip is by quartz crystal oscillator additional electric capacity construction system clock circuit, for described main control chip provides external clock, described main control chip is also connected with the audio interface be positioned on described mainboard, described main control chip is connected with USB interface by a CH340 chip, communicate for system power supply or by described CH340 chip with described main control chip.
2. according to claim 1 a kind of without keying electronic upright piano, it is characterized in that: described main control chip is STC89C51 single-chip microcomputer.
3. according to claim 1 a kind of without keying electronic upright piano, it is characterized in that: described LED running lamp is the pilot lamp of corresponding 7 the infrared human body sensors of light emitting diode as scale that row have red, green, yellow three kinds of colors.
4. according to claim 1 a kind of without keying electronic upright piano, it is characterized in that: described electric capacity is two 33P electric capacity.
5. according to claim 1 a kind of without keying electronic upright piano, it is characterized in that: described infrared human body induction module comprises pyroelectric infrared human body sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520123846.4U CN204496905U (en) | 2015-03-04 | 2015-03-04 | A kind of without keying electronic upright piano |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520123846.4U CN204496905U (en) | 2015-03-04 | 2015-03-04 | A kind of without keying electronic upright piano |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204496905U true CN204496905U (en) | 2015-07-22 |
Family
ID=53576201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520123846.4U Expired - Fee Related CN204496905U (en) | 2015-03-04 | 2015-03-04 | A kind of without keying electronic upright piano |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204496905U (en) |
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2015
- 2015-03-04 CN CN201520123846.4U patent/CN204496905U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20180304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |