CN110349557A - A kind of thumb piano auxiliary of Bluetooth communication plays device - Google Patents
A kind of thumb piano auxiliary of Bluetooth communication plays device Download PDFInfo
- Publication number
- CN110349557A CN110349557A CN201910474502.0A CN201910474502A CN110349557A CN 110349557 A CN110349557 A CN 110349557A CN 201910474502 A CN201910474502 A CN 201910474502A CN 110349557 A CN110349557 A CN 110349557A
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- illuminating part
- bluetooth
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- 210000003813 thumb Anatomy 0.000 title claims abstract description 24
- 230000005669 field effect Effects 0.000 claims description 34
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 241001062009 Indigofera Species 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10C—PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS
- G10C3/00—Details or accessories
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10G—REPRESENTATION OF MUSIC; RECORDING MUSIC IN NOTATION FORM; ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR, e.g. SUPPORTS
- G10G1/00—Means for the representation of music
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of thumb piano of Bluetooth communication auxiliary to play device, the bluetooth module and light display module being connected including microprocessor and respectively with the microprocessor, microprocessor are suitable for controlling light display module by the received control signal of bluetooth module institute；Microprocessor is connected with the memory of the encoded information to store melody；Microprocessor, bluetooth module, light display module and memory are respectively connected with same power supply and are powered by the power supply；Light display module includes scan drive circuit and illuminating part group, scan drive circuit is connected with illuminating part group, illuminating part group includes several respectively with the one-to-one illuminating part of each position of piano key in thumb piano, and what scan drive circuit was suitable for receiving the encoded information for the correspondence melody that microprocessor is sent to control each illuminating part in illuminating part group lights sequence.The present invention has the following advantages and effects: the display of light display module can be remotely controlled by bluetooth module, it is very convenient.
Description
Technical field
The present invention relates to thumb piano, in particular to the thumb piano auxiliary of a kind of Bluetooth communication plays device.
Background technique
With the improvement of people's living standards, the promotion of living standard has driven the promotion of spiritual demand, Yi Xiete
Color culture musical instrument has brought the enjoyment of spirit, and thumb piano can play sky as an African traditional instrument, the musical instrument
Spirit, euphony, it is deep to be liked by young man.But layman does not understand music score, or is not desired to see music score, makes very much
Fan hangs back, and is badly in need of a kind of easily guide and plays device, fan is enable to play out interesting to listen to melody easily.
Summary of the invention
The object of the present invention is to provide a kind of thumb piano of Bluetooth communication auxiliary to play device, to solve lacking for the prior art
Point and deficiency.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of thumb piano of Bluetooth communication
Auxiliary plays device, the bluetooth module and light display module being connected including microprocessor and respectively with the microprocessor, described
Microprocessor be suitable for controlling light display module by the bluetooth module received control signal of institute；The microprocessor connects
It is connected to the memory of the encoded information to store melody；Microprocessor, bluetooth module, light display module and the storage
Device is respectively connected with same power supply and is powered by the power supply；The light display module includes scan drive circuit and shines
Part group, the scan drive circuit are connected with illuminating part group, and the illuminating part group includes several respectively and in thumb piano
The one-to-one illuminating part of each position of piano key, the scan drive circuit be suitable for receive microprocessor send correspondence melody
Encoded information light sequence control each illuminating part in illuminating part group.
By using above-mentioned technical proposal, the encoded information of the melody editted in advance is stored in memory, micro process
Device receives the encoded information of corresponding melody and is sent to light display module, the side that light display module is lighted using each illuminating part
Formula presses corresponding key in thumb piano come guidance user step by step, to make user according to the prompt of illuminating part slowly bullet
Complete melody is played out, sound device is played reduces that its is professional as far as possible, and then attracts the interest of fan.In the present invention
In, facilitate user remotely to control by bluetooth, user can be by installing application in mobile device, such as mobile phone thus to switch
Switching melody changes illuminating part and lights speed, lays the foundation for long-range of the invention, technicalization, enhanced convenience is more suitable
Answer high-tech modern society.
Be further arranged to: the power supply includes battery, checks the electric quantity detecting circuit of the battery capacity and to be somebody's turn to do
The charging circuit of battery charging.
By using above-mentioned technical proposal, make user's more convenient to use, electric quantity detecting circuit energy real-time detection battery
Capacity, situation out of power occurs suddenly when facilitating the user to charge battery to avoid using in low battery；Charging circuit can
User is facilitated to charge the battery, it is very convenient without buying new battery again.
Be further arranged to: the electric quantity detecting circuit include resistance R5, field-effect tube Q2, resistance R4, resistance R6,
One end of capacitor C9, triode Q4 and resistance R12, the resistance R5 connect the anode of battery and the source electrode of field-effect tube Q2,
The grid of the other end connection field-effect tube Q2 of resistance R5 and the collector of triode Q4, the drain electrode of field-effect tube Q2 connect resistance
One end of R4, one end, one end of capacitor C9 and the enable end of microprocessor of the other end connection resistance R6 of resistance R4, resistance R6
Other end connection capacitor C9 the other end, which is grounded simultaneously, and the base stage of triode Q4 connects one end of resistance R12, resistance
The enable end of the other end connection microprocessor of R12, the emitter ground connection of triode Q4.
By using above-mentioned technical proposal, resistance R5, field-effect tube Q2, resistance R4, resistance R6, capacitor C9, triode Q4
With the electric quantity detecting circuit of resistance R12 composition battery, microprocessor exports high level, triode Q4 and field-effect by enable end
Pipe Q2 conducting, cell voltage give the enable end of microprocessor after dividing by resistance R4, resistance R6, this of microprocessor is enabled
The analog voltage input port as analog-to-digital conversion is held, the voltage of battery is obtained.
Be further arranged to: the charging circuit includes charging chip U3 and a charging interface, the charging
Mouth is connected to the input terminal of charging chip U3, and the output end of the charging chip U3 is connected with battery.
By using above-mentioned technical proposal, charging interface uses the USB charge port of TYPEC type, and external power supply passes through
The charging interface is powered to battery, and charging chip U3 uses TP4056 chip, which is charging management chip, is used to battery
It charges.
Be further arranged to: the output end of the power supply is connected with a voltage regulator circuit, which includes one steady
The output voltage of pressure chip U2 and several capacitors to filter for being connected to the periphery voltage stabilizing chip U2, the power supply passes through
The burning voltage of 3.3V is generated after the voltage regulator circuit.
By using above-mentioned technical proposal, voltage stabilizing chip U2 uses PTS78233 voltage stabilizing chip, and the chip is to the defeated of battery
Voltage carries out pressure stabilizing out, obtains the regulated power supply of 3.3V, and filter capacitor plays filter action, to be stablized and smooth direct current
3.3V voltage.
Be further arranged to: the bluetooth module includes Bluetooth chip U6, and Bluetooth chip U6 passes through with microprocessor
Serial communication is attached.
By using above-mentioned technical proposal, Bluetooth chip U6 uses JDY-18, and microprocessor passes through serial ports and Bluetooth chip
U6 is communicated, and speed, brightness and the face of illuminating part guidance can be arranged with after mobile phone pairing in Bluetooth chip U6 by mobile phone
Color.
Be further arranged to: it is aobvious with bluetooth module and light respectively to control power supply that the microprocessor is connected with one
Show that the ON-OFF control circuit of power on/off between module, the ON-OFF control circuit include resistance R7, field-effect tube Q3 and resistance
The anode of one end connection power supply of R8, the resistance R7 and the source electrode of field-effect tube Q3, the other end connection field effect of resistance R7
Should the grid of pipe Q3 and one end of resistance R8, resistance R8 the other end connection microprocessor enable end, the leakage of field-effect tube Q3
Pole connects bluetooth module and light display module.
By using above-mentioned technical proposal, resistance R7, field-effect tube Q3 and resistance R8 composition bluetooth module and light are shown
The switch control of module, when the enable end of microprocessor exports high level, field-effect tube Q3 cut-off disconnects bluetooth module and lamp
The power supply of light display module, on the contrary when microprocessor enable end export low level when, field-effect tube Q3 conducting, bluetooth module and
Light display module obtains electric；So as to make bluetooth module and light display module when not working without expending the electricity of battery,
Save the damage of electricity in battery.
Be further arranged to: the scan drive circuit includes scanning drive chip U1, scanning drive chip U1 with
Micro process is attached by serial communication.
By using above-mentioned technical proposal, scanning drive chip U1 uses TM1668 chip, passes through the string with microprocessor
Port communications drive lighting or extinguishing for corresponding illuminating part.
Be further arranged to: each illuminating part in the illuminating part group is three-color LED light.
By using above-mentioned technical proposal, selected by three-color LED light for user, user can be according to different melodies come area
The corresponding color of component selections enriches user experience.
Detailed description of the invention
Fig. 1 is the functional block diagram of embodiment；
Fig. 2 is the circuit diagram of microprocessor in embodiment, bluetooth module, electric quantity detecting circuit and ON-OFF control circuit；
Fig. 3 is the circuit diagram of charging circuit and charging interface in embodiment；
Fig. 4 is the circuit diagram of voltage regulator circuit in embodiment；
Fig. 5 is the circuit diagram of memory in embodiment；
Fig. 6 is the circuit diagram of scan drive circuit and illuminating part group in embodiment；
Fig. 7 is the control flow chart in embodiment.
In figure: 1, microprocessor；21, scan drive circuit；22, illuminating part group；221, illuminating part；3, bluetooth module；4,
Memory；51, battery；52, electric quantity detecting circuit；53, charging circuit；531, charging interface；6, voltage regulator circuit；7, switch control
Circuit.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
With reference to figures 1 through Fig. 6, a kind of thumb piano auxiliary of Bluetooth communication plays device, including microprocessor 1 and respectively with
The microprocessor 1 connected bluetooth module 3 and light display module, microprocessor 1 are suitable for through the received control of 3 institutes of bluetooth module
Signal processed controls light display module；
Microprocessor 1 is connected with the memory 4 of the encoded information to store melody；
Microprocessor 1, bluetooth module 3, light display module and memory 4 are respectively connected with same power supply and are supplied by the power supply
Electricity；
Light display module includes scan drive circuit 21 and illuminating part group 22, scan drive circuit 21 and 22 phase of illuminating part group
Even, illuminating part group 22 include it is several respectively with the one-to-one illuminating part 221 of each position of piano key in thumb piano, turntable driving
Circuit 21 is suitable for receiving the encoded information for the correspondence melody that microprocessor 1 is sent to control each illuminating part 221 in illuminating part group 22
Light sequence.
Power supply includes battery 51, checks the electric quantity detecting circuit 52 of 51 capacity of battery and filling for the battery 51 charging
Circuit 53.
Electric quantity detecting circuit 52 include resistance R5, field-effect tube Q2, resistance R4, resistance R6, capacitor C9, triode Q4 and
The anode of one end connection battery 51 of resistance R12, the resistance R5 and the source electrode of field-effect tube Q2, the other end of resistance R5 connect
Meet the grid of field-effect tube Q2 and the collector of triode Q4, one end of the drain electrode connection resistance R4 of field-effect tube Q2, resistance R4
Other end connection resistance R6 one end, one end of capacitor C9 and the enable end of microprocessor 1, the other end of resistance R6 connects electricity
Hold the other end of C9, which is grounded simultaneously, one end of the base stage connection resistance R12 of triode Q4, the other end connection of resistance R12
The enable end of microprocessor 1, the emitter ground connection of triode Q4.
Charging circuit 53 includes charging chip U3 and a charging interface 531, and charging interface 531 is connected to charging chip U3
Input terminal, the output end of charging chip U3 is connected with battery 51.
The output end of power supply is connected with a voltage regulator circuit 6, which includes a voltage stabilizing chip U2 and be connected to this
Several capacitors to filter of the periphery voltage stabilizing chip U2, the output voltage of power supply generate 3.3V's after the voltage regulator circuit 6
Burning voltage.
Bluetooth module 3 includes Bluetooth chip U6, and Bluetooth chip U6 is attached with microprocessor 1 by serial communication.
Microprocessor 1 is connected with one to control the power supply power on/off between bluetooth module 3 and light display module respectively
ON-OFF control circuit 7, ON-OFF control circuit 7 includes resistance R7, field-effect tube Q3 and resistance R8, and one end of resistance R7 connects electricity
The anode in source and the source electrode of field-effect tube Q3, the grid of the other end connection field-effect tube Q3 of resistance R7 and one end of resistance R8,
The enable end of the other end connection microprocessor 1 of resistance R8, the drain electrode connection bluetooth module 3 and light of field-effect tube Q3 show mould
Block.
Scan drive circuit 21 includes scanning drive chip U1, and scanning drive chip U1 and micro process pass through serial communication
It is attached.
Each illuminating part 221 in illuminating part group 22 is three-color LED light.
In this embodiment, microprocessor 1 is the U4 in attached drawing, uses STC8A4K64S2A12 single-chip microcontroller for master control core
Piece, the chip have the flash memory 4 of 64KB, 4,2 serial ports of data storage of 4KB, and 12 A/D are converted, and socket P2 is
Serial communication interface.
Bluetooth chip U6 uses JDY-18, and microprocessor 1 is communicated by serial ports with Bluetooth chip U6, Bluetooth chip U6
After mobile phone pairing, speed, brightness and the color of the guidance of illuminating part 221 can be set by mobile phone, by way of bluetooth
It is undoubtedly more convenient, so that user can remotely operate.
Resistance R5, field-effect tube Q2, resistance R4, resistance R6, capacitor C9, triode Q4 and resistance R12 form battery 51
Electric quantity detecting circuit 52, microprocessor 1 export high level, triode Q4 and field-effect tube Q2 conducting, 51 electricity of battery by 1 pin
Pressure gives 2 pins of microprocessor 1 after dividing by resistance R4, resistance R6,2 pin of microprocessor 1 is as analog-to-digital conversion
Analog voltage input port, obtain the voltage of battery 51.
The switch control of resistance R7, field-effect tube Q3 and resistance R8 composition bluetooth module 3 and light display module, when micro- place
When managing the 35 feet output high level of device 1, field-effect tube Q3 cut-off disconnects the power supply of bluetooth module 3 and light display module, on the contrary
When the enable end of microprocessor 1 exports low level, field-effect tube Q3 conducting, bluetooth module 3 and light display module obtain electric.
TM1 is 5 foot sockets.
Charging interface 531 is using the USB charge port of TYPEC type, and external power supply is by the charging interface 531 to battery
51 power supplies, charging chip U3 use TP4056 chip, and charging chip U3 is charging management chip, for filling to battery 51
Electricity.D18, Q1 constitute power supply automatic switchover circuit, and when there is power supply power supply in outside, VUSB obtains electric, Q1 cut-off, D18 conducting, subsequent electricity
External power supply power supply is routed, when outside is provided without power supply, VUSB is powered by battery 51 to subsequent conditioning circuit without electricity, Q1 conducting.
Voltage stabilizing chip U2 uses PTS78233 voltage stabilizing chip, which carries out pressure stabilizing to the output voltage of battery 51, obtain
The regulated power supply of 3.3V, filter capacitor play filter action, to be stablized and smooth direct current 3.3V voltage.C5, C6, C3,
C4 is filter capacitor.
Memory 4 is the U5 in attached drawing, is that AT24C64 storage chip, the chip and microprocessor 1 are carried out using IIC
Communication, R10, R11 are pull-up resistor, and C11 is filter capacitor, which is used to store the encoded information of melody.
Thumb piano has 17 metal strip strings, a corresponding illuminating part 221 above each key, and D1 ~ D17 is 17 and shines
Part 221, quite there are three light emitting diodes to form for each 221 inside of illuminating part, and scanning drive chip U1 is TM1668 chip, is led to
It crosses the chip and display, DIO, CLK, STB tri- of microprocessor 1 and scanning drive chip U1 is scanned to 17 illuminating parts 221
A pin is communicated, and corresponding illuminating part 221 is driven to light or extinguish.C1, C2 are filter capacitor.
In addition, the control flow of the present embodiment refers to attached drawing 7.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (9)
1. a kind of thumb piano auxiliary of Bluetooth communication plays device, it is characterised in that: including microprocessor (1) and micro- with this respectively
Processor (1) connected bluetooth module (3) and light display module, the microprocessor (1) are suitable for passing through bluetooth module (3)
Institute received control signal controls light display module；
The microprocessor (1) is connected with the memory (4) of the encoded information to store melody；
Microprocessor (1), bluetooth module (3), light display module and the memory (4) be respectively connected with same power supply and by
The power supply is powered；
The light display module includes scan drive circuit (21) and illuminating part group (22), the scan drive circuit
(21) be connected with illuminating part group (22), the illuminating part group (22) include it is several respectively with each position of piano key in thumb piano
One-to-one illuminating part (221), the scan drive circuit (21) are suitable for receiving the correspondence melody that microprocessor (1) is sent
Encoded information light sequence control each illuminating part (221) in illuminating part group (22).
2. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: the electricity
Source includes battery (51), checks the electric quantity detecting circuit (52) of battery (51) capacity and the charging for the battery (51) charging
Circuit (53).
3. a kind of thumb piano auxiliary of Bluetooth communication according to claim 2 plays device, it is characterised in that: the electricity
Amount detection circuit (52) includes resistance R5, field-effect tube Q2, resistance R4, resistance R6, capacitor C9, triode Q4 and resistance R12,
The anode of one end connection battery (51) of the resistance R5 and the source electrode of field-effect tube Q2, the other end connection field effect of resistance R5
Should the grid of pipe Q2 and the collector of triode Q4, field-effect tube Q2 drain electrode connection resistance R4 one end, resistance R4's is another
One end, one end of capacitor C9 and the enable end of microprocessor (1) of end connection resistance R6, the other end of resistance R6 connect capacitor C9
The other end, which is grounded simultaneously, and one end of the base stage connection resistance R12 of triode Q4, the other end of resistance R12 connects micro- place
Manage the enable end of device (1), the emitter ground connection of triode Q4.
4. a kind of thumb piano auxiliary of Bluetooth communication according to claim 2 plays device, it is characterised in that: described fills
Circuit (53) includes charging chip U3 and a charging interface (531), and the charging interface (531) is connected to charging chip
The output end of the input terminal of U3, the charging chip U3 is connected with battery (51).
5. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: the electricity
The output end in source is connected with a voltage regulator circuit (6), which includes a voltage stabilizing chip U2 and be connected to the pressure stabilizing core
Several capacitors to filter of the periphery piece U2, the output voltage of the power supply generate 3.3V after the voltage regulator circuit (6)
Burning voltage.
6. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: the indigo plant
Tooth module (3) includes Bluetooth chip U6, and Bluetooth chip U6 is attached with microprocessor (1) by serial communication.
7. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: described is micro-
Processor (1) be connected with one to control power supply respectively between bluetooth module (3) and light display module power on/off switch
Control circuit (7), the ON-OFF control circuit (7) include resistance R7, field-effect tube Q3 and resistance R8, the resistance R7's
One end connects the anode of power supply and the source electrode of field-effect tube Q3, the grid and resistance of the other end connection field-effect tube Q3 of resistance R7
The drain electrode of one end of R8, the enable end of other end connection microprocessor (1) of resistance R8, field-effect tube Q3 connects bluetooth module
(3) and light display module.
8. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: described sweeps
Retouching driving circuit (21) includes scanning drive chip U1, and scanning drive chip U1 is connected with micro process by serial communication
It connects.
9. a kind of thumb piano auxiliary of Bluetooth communication according to claim 1 plays device, it is characterised in that: the hair
Each illuminating part (221) in light part group (22) is three-color LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910474502.0A CN110349557A (en) | 2019-06-03 | 2019-06-03 | A kind of thumb piano auxiliary of Bluetooth communication plays device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910474502.0A CN110349557A (en) | 2019-06-03 | 2019-06-03 | A kind of thumb piano auxiliary of Bluetooth communication plays device |
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| Publication Number | Publication Date |
|---|---|
| CN110349557A true CN110349557A (en) | 2019-10-18 |
Family
ID=68174153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910474502.0A Pending CN110349557A (en) | 2019-06-03 | 2019-06-03 | A kind of thumb piano auxiliary of Bluetooth communication plays device |
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| Country | Link |
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| CN (1) | CN110349557A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111739481A (en) * | 2020-07-21 | 2020-10-02 | 周伟荣 | A kalimba playing aid device |
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| CN109637273A (en) * | 2019-02-01 | 2019-04-16 | 赵屹帆 | Optical signal prompts equipment, portable finger position exercising keyboard and piano |
| CN210223537U (en) * | 2019-06-03 | 2020-03-31 | 温州共响三帝电子科技有限公司 | Bluetooth communication's supplementary device of playing of thumb musical instrument |
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| US20040263494A1 (en) * | 2001-04-30 | 2004-12-30 | Poor Kyle W. | Location sensitive display device, system, and method of providing animation sequences |
| US8901405B1 (en) * | 2013-08-22 | 2014-12-02 | McCarthy Music Corp. | Electronic piano training device |
| WO2016045335A1 (en) * | 2014-09-22 | 2016-03-31 | 北京趣乐科技有限公司 | Intelligent string instrument and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111739481A (en) * | 2020-07-21 | 2020-10-02 | 周伟荣 | A kalimba playing aid device |
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