CN108873095A - Piano key acts self-adapting detecting circuit - Google Patents
Piano key acts self-adapting detecting circuit Download PDFInfo
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- CN108873095A CN108873095A CN201810836741.1A CN201810836741A CN108873095A CN 108873095 A CN108873095 A CN 108873095A CN 201810836741 A CN201810836741 A CN 201810836741A CN 108873095 A CN108873095 A CN 108873095A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
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Abstract
The invention discloses a kind of piano keys to act self-adapting detecting circuit, including control module, power module, white key detection module, black key detection module, wireless communication module and LED drive module, it power module, white key detection module, black key detection module and is connect with control module with LED drive module, white key detection module is also connect with black key detection module, wireless communication module is connect with LED drive module, and the number of white key detection module and the number of black key detection module are multiple；White key detection module includes the 5th reflection infrared sensor, the 5th thermistor, the 5th conventional, electric-resistance and the 25th resistance, and black key detection module includes the 11st infrared emission sensor, the 11st infrared receiver sensor, the 4th thermistor, eleventh resistor and the 31st resistance.Implement piano key movement self-adapting detecting circuit of the invention, has the advantages that：Movement when can play key white-black key is precisely detected.
Description
Technical field
The present invention relates to key motion detection field, in particular to a kind of piano key acts self-adapting detecting circuit.
Background technique
Traditional key detection device is can only to detect different keys, cannot identify dynamics when performance.And piano is drilled
Not requiring nothing more than each key when playing will play correctly, should also bullet to the weight (dynamics when playing) of each sound.Due to passing
The key detection device of system can only identify different keys, cannot identify dynamics when performance, therefore cannot be to key white-black key
Movement when performance is precisely detected, and there are deviations for the detection of movement when causing to the performance of key white-black key.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, provide it is a kind of can be black to key
The piano key movement self-adapting detecting circuit that movement when white key is played precisely is detected.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of piano key movement self-adapting detecting
Circuit, including control module, power module, white key detection module, black key detection module, wireless communication module and LED drive mould
Block, the power module, white key detection module, black key detection module and connect with the control module with LED drive module,
The white key detection module is also connect with the black key detection module, and the wireless communication module and the LED drive module connect
It connects, the number of the white key detection module and the number of black key detection module are multiple；
One of them described white key detection module includes the 5th reflection infrared sensor, the 5th thermistor, the 5th general
Be powered resistance and the 25th resistance, and the first pin and the 4th pin of the 5th reflection infrared sensor are all connected with the first electricity
Pressure, the second pin of the 5th reflection infrared sensor are connect with one end of the 5th thermistor, and the described 5th is anti-
The third pin for penetrating formula infrared sensor is connect with one end of one end of the 25th resistance and the 5th conventional, electric-resistance respectively,
The other end of 5th thermistor and the other end of the 5th conventional, electric-resistance are grounded, the other end of the 25th resistance
It is connect with the control module；
One of them described black key detection module includes the 11st infrared emission sensor, the 11st infrared receiver sensing
Device, the 4th thermistor, eleventh resistor and the 31st resistance, the anode and the tenth of the 11st infrared emission sensor
The collector of one infrared receiver sensor is connect with the first voltage, the cathode of the 11st infrared emission sensor with
One end of 4th thermistor connects, and the emitter of the 11st infrared receiver sensor is electric with the described 11st respectively
One end of resistance is connected with one end of the 31st resistance, the other end of the 4th thermistor and the other end of eleventh resistor
It is grounded, the other end of the 31st resistance is connect with the control module.
In piano key of the present invention movement self-adapting detecting circuit, the power module includes the first direct current
Source, the second DC power supply, the second electrolytic capacitor, third capacitor, dc-dc boost chip, the 5th electrolytic capacitor and the 6th electricity
Hold, first DC power supply respectively with the anode of second electrolytic capacitor, one end of third capacitor, dc-dc boost
First pin of chip is connected with third pin, the cathode of second electrolytic capacitor and the dc-dc boost chip
Second pin connection, the third capacitor the other end ground connection, the 5th pin of the dc-dc boost chip respectively with institute
One end of the anode, the 6th capacitor of stating the 5th electrolytic capacitor is connected with the second DC power supply, the cathode of the 5th electrolytic capacitor
It is grounded with the other end of the 6th capacitor.
Piano key of the present invention movement self-adapting detecting circuit in, the control module include microprocessor,
First capacitor, the first light emitting diode, the 18th resistance, the first slot and the 5th DC power supply, the 8th of the microprocessor the
One end of pin and first capacitor is all connected with second voltage, and the other end of the first capacitor and the tenth pin of microprocessor are equal
Ground connection, the 12nd pin of the microprocessor connect with one end of the third pin of first slot and the 18th resistance respectively
It connects, the other end of the 18th resistance is connect with the cathode of first light emitting diode, first light emitting diode
Anode connects the second voltage, and the 5th DC power supply is connect with the first pin of first slot.
In piano key of the present invention movement self-adapting detecting circuit, the wireless communication module is bluetooth mould
Block, WIFI module, gsm module, GPRS module, CDMA module, CDMA2000 module, WCDMA module, TD-SCDMA module,
Zigbee module or LoRa module.
Piano key of the present invention movement self-adapting detecting circuit in, the bluetooth module include Bluetooth chip,
Bluetooth antenna, Bluetooth antenna processing circuit and crystal oscillator, the Bluetooth antenna processing circuit include the 20th capacitor, the 21st electricity
Appearance, the second inductance, third inductance, the 22nd capacitor, the 23rd capacitor, the 4th inductance, the 5th inductance and the 25th electricity
Hold, the 25th pin of the Bluetooth chip passes through the 20th capacitor one end and second with second inductance respectively
One end of 11 capacitors connects, and the other end ground connection of second inductance, the 26th pin of the Bluetooth chip passes through institute
It states the 22nd capacitor to connect with one end of one end of the 23rd capacitor and third inductance respectively, the 23rd electricity
The other end of appearance is grounded, the other end of the 21st capacitor respectively with the other end of the third inductance and the 4th inductance
One end connection, the other end of the 4th inductance connect with one end of the 25th capacitor and one end of the 5th inductance respectively
It connects, the other end ground connection of the 25th capacitor, the other end of the 5th inductance is connect with the Bluetooth antenna, the crystalline substance
First pin of vibration is connect with the 23rd pin of the Bluetooth chip, the third pin and the Bluetooth chip of the crystal oscillator
The 22nd pin connection, the second pin of the crystal oscillator and the 4th pin are grounded.
In piano key of the present invention movement self-adapting detecting circuit, the LED drive module includes the first electricity
Solve capacitor, LED drive chip, third electrolytic capacitor, the 4th capacitor, the first inductance, the 12nd capacitor and the 33rd direct current
Source, the anode of first electrolytic capacitor, the first pin of LED drive chip and third pin with the 5th DC power supply
Connection, the cathode of first electrolytic capacitor and the second pin of LED drive chip be grounded, and the of the LED drive chip
Five pins are connect with the anode of the third electrolytic capacitor, one end of the 4th capacitor and one end of the first inductance respectively, and described
The other end of the cathode of three electrolytic capacitors and the 4th capacitor is grounded, and the other end of first inductance is respectively with the described 12nd
One end of capacitor is connected with the 33rd DC power supply, the other end ground connection of the 12nd capacitor.
It further include the first signal amplification circuit, the in piano key of the present invention movement self-adapting detecting circuit
One filter circuit, second signal amplifying circuit and the second filter circuit, the white key detection module pass sequentially through first letter
Number amplifying circuit and the first filter circuit are connect with the port AD of the microprocessor, and the black key detection module passes sequentially through institute
Second signal amplifying circuit and the second filter circuit is stated to connect with the port AD of the microprocessor.
Implement piano key movement self-adapting detecting circuit of the invention, has the advantages that：Due to being equipped with control
Module, power module, white key detection module, black key detection module, wireless communication module and LED drive module, white key detect mould
Block includes the 5th reflection infrared sensor, the 5th thermistor, the 5th conventional, electric-resistance and the 25th resistance, and black key detects mould
Block includes the 11st infrared emission sensor, the 11st infrared receiver sensor, the 4th thermistor, eleventh resistor and third
11 resistance, when powering on, control module can each key current location of automatic collection to should voltage value, and save as first
Initial value；When key moves (press or lift), key surface is changed with a distance from infrared sensor, to show as
The output voltage of infrared sensor is different, and each position corresponds to different voltage, and control module is corresponding by constantly acquisition key
AD voltage value, to know whether key is pressed or lifted；Since reflectance of the black key to infrared ray is lower, thus black key is adopted
With the infrared sensor of correlation, when black key is pressed or is lifted, receiving sensor can export different voltage values, control module
By continually scanning for the output voltage values of receiving sensor, the movement of key is just learnt；The present invention can play key white-black key
When movement precisely detected.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram in piano key of the present invention movement self-adapting detecting circuit one embodiment；
Fig. 2 is the circuit diagram of white key detection module and black key detection module in the embodiment；
Fig. 3 is the circuit diagram of power module in the embodiment；
Fig. 4 is the circuit diagram of control module in the embodiment；
Fig. 5 is the circuit diagram of bluetooth module in the embodiment；
Fig. 6 is the circuit diagram of LED drive module in the embodiment；
Fig. 7 is the flow chart of piano key motion detection in the embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In piano key of the present invention movement self-adapting detecting circuit embodiments, which acts self-adapting detecting electricity
The structural schematic diagram on road is as shown in Figure 1.In Fig. 1, it includes control module 1, power supply which, which acts self-adapting detecting circuit,
Module 2, white key detection module 3, black key detection module 4, wireless communication module 5 and LED drive module 6, wherein power module 2,
It white key detection module 3, black key detection module 4 and is connect with control module 1 with LED drive module 6, white key detection module 3 is also
It is connect with black key detection module 4, wireless communication module 5 is connect with LED drive module 6, the number and black key of white key detection module 3
The number of detection module 4 be it is multiple, in the present embodiment, the number of white key detection module 3 is 52, black key detection module 4
Number is 36.
Fig. 2 is the circuit diagram of white key detection module and black key detection module in the present embodiment, in Fig. 2, one of them
White key detection module 3 includes the 5th reflection infrared sensor L5A, the 5th thermistor T5, the 5th conventional, electric-resistance R5 and second
15 resistance R25, wherein the first pin and the 4th pin of the 5th reflection infrared sensor L5 is all connected with first voltage V1,
The second pin of 5th reflection infrared sensor L5 is connect with one end of the 5th thermistor T5, the 5th reflective infrared sensing
The third pin of device L5 is connect with one end of one end of the 25th resistance R25 and the 5th conventional, electric-resistance R5 respectively, the 5th temperature-sensitive
The other end of the other end of resistance T5 and the 5th conventional, electric-resistance R5 are grounded, the other end and control mould of the 25th resistance R25
Block 1 connects.
One of black key detection module 4 includes the 11st infrared emission sensor L11A, the 11st infrared receiver sensing
Device L11B, the 4th thermistor T4, eleventh resistor R11 and the 31st resistance R31, the 11st infrared emission sensor L11A
Anode and the collector of the 11st infrared receiver sensor L11B connect with first voltage V1, the 11st infrared emission sensing
The cathode of device L11A is connect with one end of the 4th thermistor T4, the emitter of the 11st infrared receiver sensor L11B respectively with
One end of eleventh resistor R11 is connected with one end of the 31st resistance R31, the other end and the 11st of the 4th thermistor T4
The other end of resistance R11 is grounded, and the other end of the 31st resistance R31 is connect with control module 1.
The circuit diagram of part several white key detection modules and black key detection module is only shown in Fig. 2,52 white
Key detection module 3 and 36 black key detection module 4 can be two or several sensor series or acquisition in parallel, acquisition and can be
While or acquisition time.
In the present embodiment, when powering on, control module 1 can the current position of each key of automatic collection to should voltage
Value, and save as initial value；When key moves (press or lift), key surface has occurred with a distance from infrared sensor
Variation, so that the output voltage for showing as infrared sensor is different, each position corresponds to different voltage, and control module 1 passes through
The constantly corresponding AD voltage value of acquisition key, to know whether key is pressed or lifted.Since black key is to the luminosity of infrared ray
It is lower, thus black key uses the infrared sensor of correlation, when black key is pressed or is lifted, infrared receiver sensor can be exported not
With voltage value, control module 1 just learns the movement of key by continually scanning for the output voltage values of infrared receiver sensor.
It is noted that in the present embodiment, by pasting reflective sheeting on black key, can also using white key detection module 3 come
Detect the movement of black key；The corresponding voltage value in position by constantly acquiring each key can acquire two when key movement
The time difference of a location point, to calculate the speed V=f (t) of each key movement, wherein V is the speed of key movement, t
For the time difference of two location points of key, a time difference t when key is pressed by two positions point is measured, then passes through two positions
The time difference t of point is converted into dynamics value.
Fig. 3 is the circuit diagram of power module in the present embodiment, and in Fig. 3, which includes the first DC power supply
VCC1, the second DC power supply VCC2, the second electrolytic capacitor C2, third capacitor C3, dc-dc boost chip U2, the 5th electrolysis
Capacitor C5 and the 6th capacitor C6, wherein the first DC power supply VCC1 respectively with the anode of the second electrolytic capacitor C2, third capacitor C3
One end, dc-dc boost chip U2 the first pin connected with third pin, the cathode of the second electrolytic capacitor C2 and straight
The connection of stream-DC decompression chip U2 second pin, the other end ground connection of third capacitor C3, dc-dc boost chip U2's
5th pin is connect with the anode of the 5th electrolytic capacitor C5, one end of the 6th capacitor C6 and the second DC power supply VCC2 respectively, the
The cathode of five electrolytic capacitor C5 and the other end of the 6th capacitor C6 are grounded.First DC power supply VCC1 as power input,
For second electrolytic capacitor C2 and third capacitor C3 as filter capacitor, dc-dc boost chip U2 can be by the first DC power supply
VCC1 drops to the second DC power supply VCC2, the 5th electrolytic capacitor C5 and the 6th capacitor C6 as filter capacitor, so that the power supply mould
Block 2 exports stable DC source.
Fig. 4 is the circuit diagram of control module in the present embodiment, in Fig. 4, the control module 1 include microprocessor U1,
First capacitor C1, the first Light-emitting diode LED 1, the 18th resistance R18, the first slot P1 and the 5th DC power supply VCC5,
In, the 8th pin of microprocessor U1 and one end of first capacitor C1 are all connected with second voltage V2, the other end of first capacitor C1
It is grounded with the tenth pin of microprocessor U1, the 12nd pin of the microprocessor U1 third pin with the first slot P1 respectively
It is connected with one end of the 18th resistance R18, the cathode of the other end of the 18th resistance R18 and the first Light-emitting diode LED 1 connects
It connects, the anode of the first light emitting diode R18 connects second voltage V2, and the 5th DC power supply VCC5 draws with the first of the first slot P1
Foot connection.First capacitor C1 is filter capacitor, microprocessor U1, first capacitor C1, the first Light-emitting diode LED 1 and the 18th
Resistance R18 forms portable lamp indicating circuit.
It is noted that in the present embodiment, it, can be in white key detection module 3 and microprocessor U1 since signal is smaller
Between increase signal amplification circuit and filter circuit, increase signal amplification electricity between black key detection module 4 and microprocessor U1
Road and filter circuit, specifically, piano key movement self-adapting detecting circuit further includes the first signal amplification circuit, first
Filter circuit, second signal amplifying circuit and the second filter circuit (not shown), wherein white key detection module 3 successively leads to
It crosses the first signal amplification circuit and the first filter circuit to connect with AD (modulus) port of microprocessor U1, black key detection module 4
Second signal amplifying circuit and the second filter circuit is passed sequentially through to connect with the port AD of microprocessor U1.
In the present embodiment, above-mentioned wireless communication module 5 can be bluetooth module, WIFI module, gsm module, GPRS module,
CDMA module, CDMA2000 module, WCDMA module, TD-SCDMA module, Zigbee module or LoRa module etc..Pass through setting
Various wireless communication mode can satisfy the demand of different user and different occasions, increase the flexibility of communication mode.Especially
When using LoRa module, farther out, and communication performance is relatively stable for communication distance, is suitable for the higher field of QoS requirement
It closes.
When wireless communication module 5 is using bluetooth module, the circuit diagram of the bluetooth module is as shown in Figure 5.In Fig. 5,
Bluetooth module includes Bluetooth chip U6, Bluetooth antenna ANT, Bluetooth antenna processing circuit and crystal oscillator Y1, wherein Bluetooth antenna processing
Circuit include the 20th capacitor C12, the 21st capacitor C11, the second inductance L2, third inductance L3, the 22nd capacitor C22,
23rd capacitor C23, the 4th inductance L4, the 5th inductance L5 and the 25th capacitor C25, the 25th of Bluetooth chip U6 are drawn
Foot is connect with one end of one end of the second inductance L2 and the 21st capacitor C21 respectively by the 20th capacitor C20, the second inductance
The other end of L2 is grounded, the 26th pin of Bluetooth chip U6 by the 22nd capacitor C22 respectively with the 23rd capacitor
One end of C23 is connected with one end of third inductance L3, the other end ground connection of the 23rd capacitor C23, the 21st capacitor C21's
The other end is connect with one end of the other end of third inductance L3 and the 4th inductance L4 respectively, the other end of the 4th inductance L4 respectively with
One end of 25th capacitor C25 is connected with one end of the 5th inductance L5, the other end ground connection of the 25th capacitor C25, and the 5th
The other end of inductance L5 is connect with Bluetooth antenna ANT, and the first pin of crystal oscillator Y1 and the 23rd pin of Bluetooth chip U6 connect
It connects, the third pin of crystal oscillator Y1 is connect with the 22nd pin of Bluetooth chip U6, the second pin of crystal oscillator Y1 and the 4th pin
It is grounded.
Fig. 7 is the flow chart of piano key motion detection in the present embodiment, and in Fig. 7, which includes first
Electrolytic capacitor C1, LED drive chip U5, third electrolytic capacitor C3, the 4th capacitor C4, the first inductance L1, the 12nd capacitor C12 and
33rd DC power supply VCC33, wherein the anode of the first electrolytic capacitor C1, the first pin of LED drive chip U5 and third
Pin connects VCC5 with the 5th DC power supply and connects, and the cathode of the first electrolytic capacitor C1 and the second pin of LED drive chip U5 are equal
Ground connection, the 5th pin of LED drive chip U5 one end and first with the anode of third electrolytic capacitor C3, the 4th capacitor C4 respectively
One end of inductance L1 connects, and the cathode of third electrolytic capacitor C3 and the other end of the 4th capacitor C4 are grounded, the first inductance L1's
The other end is connect with one end of the 12nd capacitor C12 and the 33rd DC power supply VCC33 respectively, and the 12nd capacitor C12's is another
One end ground connection.
Working principle of the present invention is as follows：Piano key movement self-adapting detecting circuit is placed on piano (including all
Keyboard instrument) key on, the piano key movement self-adapting detecting circuit can be placed under each key inside piano
Face, for detecting the movement of each key；External power adapter in several seconds after connecing power supply, is put in qin to system power supply
Control module 1 below key can constantly acquire the corresponding position voltage value of 88 keys by I/O port；When being put in above key,
It acquires the corresponding light sensation amount of 52 white keys and 36 black keys and converts it into voltage value, be saved as initial value；It presses
When each key, corresponding LED light is lighted；Connect the APP of mobile phone or tablet computer by bluetooth module, when playing piano
The information of each key can be sent to host computer, for functional applications such as teaching or game.Fig. 7 is piano key in the present embodiment
The flow chart of motion detection.
In short, being detected with infrared sensor (reflective or correlation) to key movement, in the present embodiment due to qin
Key pressing or when lifting, key surface (or key bottom) can change at a distance from infrared sensor surface, according to difference
Apart from when, the received light intensity of infrared sensor is different, so that the electric current by resistance is different, just produces on resistance different
Pressure drop passes through the continuous collection voltages of microprocessor U1, so that it may judge whether key is pressed or lifted, that is, judge to be under which
Key (note).During pressing, acquisition key can be converted by the time difference between two positions point by V=f (t)
Obtain pressing dynamics when key.It is very weak to the reflection of infrared ray since black key is black if be placed on above key, it can
To use two methods, the first is to paste one layer of reflective sheeting on black key surface, using the testing principle as white key；Second
It is using correlation infrared sensor.The present invention can identify different keys, can also identify dynamics when performance, energy simultaneously
Movement when playing key white-black key is precisely detected.
A voltage comparator circuit, the electricity can also be connect respectively after white key detection module 3 and black key detection module 4
Pressing includes voltage comparator in comparison circuit, such as：LM339, the difference of the voltage of different location, thus when exporting key movement
Two position switch information, and microprocessor U1 directly acquires the corresponding switching value information in key depressed position in control module 1,
The size of keystroke dynamics can be calculated with f (t) again.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of piano key acts self-adapting detecting circuit, which is characterized in that including control module, power module, white key inspection
Survey module, black key detection module, wireless communication module and LED drive module, the power module, white key detection module, black key
It detection module and is connect with the control module with LED drive module, the white key detection module is also detected with the black key
Module connection, the wireless communication module are connect with the LED drive module, number and the black key inspection of the white key detection module
It is multiple for surveying the number of module；
One of them described white key detection module includes the 5th reflection infrared sensor, the 5th thermistor, the 5th common electricity
Resistance and the 25th resistance, the first pin and the 4th pin of the 5th reflection infrared sensor are all connected with first voltage,
The second pin of 5th reflection infrared sensor is connect with one end of the 5th thermistor, and the described 5th is reflective
The third pin of infrared sensor is connect with one end of one end of the 25th resistance and the 5th conventional, electric-resistance respectively, described
The other end of 5th thermistor and the other end of the 5th conventional, electric-resistance are grounded, the other end of the 25th resistance and institute
State control module connection；
One of them described black key detection module includes the 11st infrared emission sensor, the 11st infrared receiver sensor, the
Four thermistors, eleventh resistor and the 31st resistance, the anode of the 11st infrared emission sensor and the 11st red
The collector of outer receiving sensor is connect with the first voltage, the cathode of the 11st infrared emission sensor with it is described
One end of 4th thermistor connects, the emitter of the 11st infrared receiver sensor respectively with the eleventh resistor
One end is connected with one end of the 31st resistance, and the other end of the 4th thermistor and the other end of eleventh resistor connect
The other end on ground, the 31st resistance is connect with the control module.
2. piano key according to claim 1 acts self-adapting detecting circuit, which is characterized in that the power module packet
Include the first DC power supply, the second DC power supply, the second electrolytic capacitor, third capacitor, dc-dc boost chip, the 5th electrolysis
Capacitor and the 6th capacitor, first DC power supply one end, straight with the anode of second electrolytic capacitor, third capacitor respectively
The first pin of stream-DC decompression chip is connected with third pin, the cathode of second electrolytic capacitor and the DC-DC
It is depressured the second pin connection of chip, the other end ground connection of the third capacitor, the 5th of the dc-dc boost chip draws
Foot is connect with the anode of the 5th electrolytic capacitor, one end of the 6th capacitor and the second DC power supply respectively, the 5th electrolysis
The other end of the cathode of capacitor and the 6th capacitor is grounded.
3. piano key according to claim 2 acts self-adapting detecting circuit, which is characterized in that the control module packet
Include microprocessor, first capacitor, the first light emitting diode, the 18th resistance, the first slot and the 5th DC power supply, micro- place
One end of the 8th pin and first capacitor of managing device is all connected with second voltage, the other end of the first capacitor and microprocessor
Tenth pin is grounded, and the 12nd pin of the microprocessor is electric with the third pin of first slot and the 18th respectively
One end of resistance connects, and the other end of the 18th resistance is connect with the cathode of first light emitting diode, first hair
The anode of optical diode connects the second voltage, and the 5th DC power supply is connect with the first pin of first slot.
4. acting self-adapting detecting circuit to piano key described in 3 any one according to claim 1, which is characterized in that institute
State wireless communication module be bluetooth module, WIFI module, gsm module, GPRS module, CDMA module, CDMA2000 module,
WCDMA module, TD-SCDMA module, Zigbee module or LoRa module.
5. piano key according to claim 3 acts self-adapting detecting circuit, which is characterized in that the bluetooth module packet
Bluetooth chip, Bluetooth antenna, Bluetooth antenna processing circuit and crystal oscillator are included, the Bluetooth antenna processing circuit includes the 20th electricity
Appearance, the 21st capacitor, the second inductance, third inductance, the 22nd capacitor, the 23rd capacitor, the 4th inductance, the 5th inductance
With the 25th capacitor, the 25th pin of the Bluetooth chip by the 20th capacitor respectively with second inductance
One end connected with one end of the 21st capacitor, the other end of second inductance ground connection, the 20th of the Bluetooth chip the
Six pins are connect with one end of one end of the 23rd capacitor and third inductance respectively by the 22nd capacitor, institute
State the other end ground connection of the 23rd capacitor, the other end of the 21st capacitor other end with the third inductance respectively
It is connected with one end of the 4th inductance, the other end of the 4th inductance is electric with one end of the 25th capacitor and the 5th respectively
One end of sense connects, the other end ground connection of the 25th capacitor, the other end and the Bluetooth antenna of the 5th inductance
Connection, the first pin of the crystal oscillator connect with the 23rd pin of the Bluetooth chip, the third pin of the crystal oscillator and
22nd pin of the Bluetooth chip connects, and the second pin of the crystal oscillator and the 4th pin are grounded.
6. piano key according to claim 5 acts self-adapting detecting circuit, which is characterized in that the LED drives mould
Block includes the first electrolytic capacitor, LED drive chip, third electrolytic capacitor, the 4th capacitor, the first inductance, the 12nd capacitor and the
33 DC power supplies, the anode of first electrolytic capacitor, the first pin of LED drive chip and third pin with it is described
The connection of 5th DC power supply, the cathode of first electrolytic capacitor and the second pin of LED drive chip are grounded, the LED
5th pin of driving chip respectively with the anode of the third electrolytic capacitor, one end of the 4th capacitor and one end of the first inductance
Connection, the cathode of the third electrolytic capacitor and the other end of the 4th capacitor are grounded, the other end difference of first inductance
It is connect with one end of the 12nd capacitor and the 33rd DC power supply, the other end ground connection of the 12nd capacitor.
7. piano key according to claim 3 acts self-adapting detecting circuit, which is characterized in that further include the first signal
Amplifying circuit, the first filter circuit, second signal amplifying circuit and the second filter circuit, the white key detection module pass sequentially through
First signal amplification circuit and the first filter circuit are connect with the port AD of the microprocessor, the black key detection module
The second signal amplifying circuit and the second filter circuit is passed sequentially through to connect with the port AD of the microprocessor.
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| CN201810836741.1A CN108873095A (en) | 2018-07-26 | 2018-07-26 | Piano key acts self-adapting detecting circuit |
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| CN113671590A (en) * | 2021-07-01 | 2021-11-19 | 浙江大华技术股份有限公司 | Infrared sensor and infrared sensing system |
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Application publication date: 20181123 |