CN203786940U - Piano key indicating circuit - Google Patents
Piano key indicating circuit Download PDFInfo
- Publication number
- CN203786940U CN203786940U CN201420218266.9U CN201420218266U CN203786940U CN 203786940 U CN203786940 U CN 203786940U CN 201420218266 U CN201420218266 U CN 201420218266U CN 203786940 U CN203786940 U CN 203786940U
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- CN
- China
- Prior art keywords
- circuit
- triode
- control chip
- piano key
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a piano key indicating circuit which mainly resolves problems of boring and complicated piano learning and unsatisfied people demands in the prior art. The piano key indicating circuit comprises a power circuit, a charging circuit, a DC-DC voltage converting circuit, a switch circuit, a MCU master control circuit, a Bluetooth transmission circuit, an LED driving circuit, and an LED display array. The charging circuit and the DC-DC voltage converting circuit are connected with the power circuit. The switch circuit is connected between the DC-DC voltage converting circuit and the power circuit. The MCU master control circuit is connected with the DC-DC voltage converting circuit. The Bluetooth transmission circuit and the LED driving circuit are connected with the MCU master control circuit. The LED display array is connected with the LED driving circuit. By means of the above scheme, the piano key indicating circuit achieves purposes of good extendibility and interest and has high practical value and promotional value.
Description
Technical field
The utility model relates to a kind of indicating circuit, specifically, relates to a kind of piano key indicating circuit.
Background technology
Along with social progress, people's living standard improves day by day, piano progresses into the people visual field as a kind of popular musical instrument, increasing people takes time and energy goes study, but the study of musical instrument is very uninteresting, also need a large amount of time, traditional mode that repeats exercise cannot meet people's demand.
Utility model content
The purpose of this utility model is to provide a kind of piano key indicating circuit, and the study that mainly solves the piano existing in prior art is very uninteresting, complicated, cannot meet the problem of people's demand.
To achieve these goals, the technical solution adopted in the utility model is as follows:
Piano key indicating circuit, comprise power circuit, the charging circuit being all connected with power circuit and DC-DC voltage conversion circuit, be connected in the on-off circuit between DC-DC voltage conversion circuit and power circuit, the MCU governor circuit being connected with DC-DC voltage conversion circuit, the Bluetooth transmission circuit and the LED drive circuit that are connected with MCU governor circuit respectively, the LED array of display being connected with LED drive circuit.
Specifically, described MCU governor circuit comprises main control chip IC5, be parallel to the crystal oscillator X between two pins of main control chip IC5, be connected to capacitor C 1 and capacitor C 2 between crystal oscillator X two ends and ground, described DC-DC voltage conversion circuit, LED drive circuit and Bluetooth transmission circuit are all connected with main control chip IC5.
Further, described LED drive circuit comprises that base stage is connected with main control chip IC5 respectively, collector is all connected with LED array of display and emitter is all connected with DC-DC voltage conversion circuit with main control chip IC5 after interconnecting triode Q1, triode Q2, triode Q3, triode Q4, triode Q5, triode Q6 and triode Q7.
Further, described power circuit comprises power management chip IC3, after series connection, be connected in STBY pin and the light emitting diode D1 between VCC pin and the resistance R 2 of power management chip IC3, one end is connected with the CHRG pin of power management chip IC3, the other end is connected in light emitting diode D1 and resistance R 2 between light emitting diode D2, between the BAT pin of this power management chip IC3 and CHRG pin, be in series with resistance R 3 and resistance R 4, described charging circuit is all connected with power management chip IC3 with DC-DC voltage conversion circuit.
As preferably, the MINIUSB interface circuit of described charging circuit for being connected with the VCC pin of power management chip IC3 by resistance R 1.
In the utility model, described DC-DC voltage conversion circuit comprises the control chip IC4 that BAT pin is connected with the BAT pin of power management chip IC3, and the VCC pin of this control chip IC4 is connected with emitter, main control chip IC5 and the Bluetooth transmission circuit of triode Q1 respectively with inductance L 1 by the resistance R 5 of series connection mutually.
Compared with prior art, the utlity model has following beneficial effect:
(1) in the utility model, provide a kind of design circuit framework cleverly, according to this circuit framework, by simple Function Extension, just can realize the indication to piano key, thereby effectively improve the interest of study, design very ingeniously, cost performance is higher, is applicable to large-scale promotion application.
Accompanying drawing explanation
Fig. 1 is system chart of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and embodiment of the present utility model includes but not limited to the following example.
Embodiment
Very uninteresting, complicated for solving the study of the piano existing in prior art, cannot meet the problem of people's demand, as shown in Figure 1 and Figure 2, the utility model discloses a kind of piano key indicating circuit, this indicating circuit mainly comprises charging circuit, power circuit, DC-DC voltage conversion circuit, MCU governor circuit, LED drive circuit, LED array of display, Bluetooth transmission circuit and on-off circuit.
Wherein, adopt MINI usb circuit as USB charging inlet, provide 5V to power to power circuit, power circuit adopts tp4057 as power management chip IC3, coupled light emitting diode D1, light emitting diode D2 carry out charged state indication, and during charging, light emitting diode D1 Chang Liang, light emitting diode D2 extinguish; While being full of, light emitting diode D2 Chang Liang, light emitting diode D1 extinguish.DC-DC voltage conversion circuit adopts HM-11 chip as main control chip IC2, provide subsequent conditioning circuit needed 3.3V voltage, whether between itself and power circuit, be connected with an on-off circuit (toggle switch) and control to circuit supply, when Power supply, light emitting diode D3 is bright.MCU governor circuit and LED drive circuit are the control sections of whole product, and MCU governor circuit mainly adopts main control chip STC89LE52 to realize this function.Bluetooth transmission circuit adopts HM06 as transmission unit, its can receive from the indication of the built-in relevant APP such as mobile phone, PC, TV (control the light on and off of LED lamp in LED array, meanwhile, also can sending and receiving some other control command); Fingerboard LED array of display, requires the relevant control being received by Bluetooth transmission circuit to show by the light on and off of corresponding LED.
As shown in Figure 2, above-mentioned in, MCU governor circuit comprises main control chip IC5, is parallel to the crystal oscillator X between two pins of main control chip IC5, is connected to capacitor C 1 and capacitor C 2 between crystal oscillator X two ends and ground; LED drive circuit comprises that base stage is connected with main control chip IC5 respectively, collector is all connected with LED array of display and emitter is all connected with DC-DC voltage conversion circuit with main control chip IC5 after interconnecting triode Q1, triode Q2, triode Q3, triode Q4, triode Q5, triode Q6 and triode Q7; Power circuit comprises power management chip IC3, after series connection, be connected in STBY pin and the light emitting diode D1 between VCC pin and the resistance R 2 of power management chip IC3, one end is connected with the CHRG pin of power management chip IC3, the other end is connected in light emitting diode D1 and resistance R 2 between light emitting diode D2, between the BAT pin of this power management chip IC3 and CHRG pin, be in series with resistance R 3 and resistance R 4; The MINIUSB interface circuit of charging circuit for being connected with the VCC pin of power management chip IC3 by resistance R 1; DC-DC voltage conversion circuit comprises the control chip IC4 that BAT pin is connected with the BAT pin of power management chip IC3, in the present embodiment, select bl8021, the VCC pin of this control chip IC4 is connected with emitter, main control chip IC5 and the Bluetooth transmission circuit of triode Q1 respectively with inductance L 1 by the resistance R 5 of series connection mutually.
On the basis of foregoing circuit, the present embodiment is also connected with part auxiliary element and line, and for guaranteeing the normal operation of circuit, the use of these auxiliary elements belongs to the circuit application custom of industry universal, does not repeat them here.
Based on this piano indicating circuit, can be connected as smart mobile phone, intelligent television, intelligent PAD etc. by Bluetooth communication and smart machine, musical notes in smart machine can be by the pilot lamp corresponding demonstration one by one of piano indicator, thereby guiding piano practice person play with bullet, reduces learning cost and difficulty.
According to above-described embodiment, just can realize well the utility model.
Claims (6)
1. piano key indicating circuit, it is characterized in that, comprise power circuit, the charging circuit being all connected with power circuit and DC-DC voltage conversion circuit, be connected in the on-off circuit between DC-DC voltage conversion circuit and power circuit, the MCU governor circuit being connected with DC-DC voltage conversion circuit, the Bluetooth transmission circuit and the LED drive circuit that are connected with MCU governor circuit respectively, the LED array of display being connected with LED drive circuit.
2. piano key indicating circuit according to claim 1, it is characterized in that, described MCU governor circuit comprises main control chip IC5, be parallel to the crystal oscillator X between two pins of main control chip IC5, be connected to capacitor C 1 and capacitor C 2 between crystal oscillator X two ends and ground, described DC-DC voltage conversion circuit, LED drive circuit and Bluetooth transmission circuit are all connected with main control chip IC5.
3. piano key indicating circuit according to claim 2, it is characterized in that described LED drive circuit comprises that base stage is connected with main control chip IC5 respectively, collector is all connected with LED array of display and emitter is all connected with DC-DC voltage conversion circuit with main control chip IC5 after interconnecting triode Q1, triode Q2, triode Q3, triode Q4, triode Q5, triode Q6 and triode Q7.
4. piano key indicating circuit according to claim 3, it is characterized in that, described power circuit comprises power management chip IC3, after series connection, be connected in STBY pin and the light emitting diode D1 between VCC pin and the resistance R 2 of power management chip IC3, one end is connected with the CHRG pin of power management chip IC3, the other end is connected in the light emitting diode D2 between light emitting diode D1 and resistance R 2, between the BAT pin of this power management chip IC3 and CHRG pin, be in series with resistance R 3 and resistance R 4, described charging circuit is all connected with power management chip IC3 with DC-DC voltage conversion circuit.
5. piano key indicating circuit according to claim 4, is characterized in that, the MINIUSB interface circuit of described charging circuit for being connected with the VCC pin of power management chip IC3 by resistance R 1.
6. piano key indicating circuit according to claim 5, it is characterized in that, described DC-DC voltage conversion circuit comprises the control chip IC4 that BAT pin is connected with the BAT pin of power management chip IC3, and the VCC pin of this control chip IC4 is connected with emitter, main control chip IC5 and the Bluetooth transmission circuit of triode Q1 respectively with inductance L 1 by the resistance R 5 of series connection mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420218266.9U CN203786940U (en) | 2014-04-30 | 2014-04-30 | Piano key indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420218266.9U CN203786940U (en) | 2014-04-30 | 2014-04-30 | Piano key indicating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203786940U true CN203786940U (en) | 2014-08-20 |
Family
ID=51323101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420218266.9U Expired - Fee Related CN203786940U (en) | 2014-04-30 | 2014-04-30 | Piano key indicating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203786940U (en) |
-
2014
- 2014-04-30 CN CN201420218266.9U patent/CN203786940U/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: 20140820 Termination date: 20200430 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |