CN103338062A - Mobile phone host terminal for controlling display system wirelessly based on Bluetooth - Google Patents
Mobile phone host terminal for controlling display system wirelessly based on Bluetooth Download PDFInfo
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Abstract
The invention discloses a mobile phone host terminal for controlling a display system wirelessly based on Bluetooth. The mobile phone host terminal comprises an interaction control interface, a dynamic detector and a camera module, and is used for acquiring pictures or character operating instructions, thereby realizing control for a display terminal. The mobile phone host terminal for controlling the display system based on a Bluetooth module is mainly advantageous in low cost, high reliability, strong portability and wide universality.
Description
Technical field
The present invention relates to the Bluetooth control field, relate in particular to the wireless demonstration of Bluetooth control field.
Background technology
Bluetooth technology has just formed standard as far back as 1999, it begins most is to be the purpose short-range communication protocols in order to substitute wire cable, is intended to replace individual PC, printer, and mobile phone, fax, wired on the equipment such as earphone, its working frequency range is ISM2.4GHz.Though it has numerous advantages, for example networking is convenient, and frequency hopping is used in the support voice transmission, before 2006, because price reasons all fails to be popularized in a large number.
Since 2009, along with a large amount of of smart mobile phone popularize, bluetooth module has become the standard configuration of mobile phone, and along with the further of agreement improved and reinforcement, current to 4.0 versions, support more kinds of application scenarioss (profile).Android, iOS, the extensive application of operating systems such as WM makes that the software development of intelligent machine is more and more simpler and rapid, this just makes bluetooth can be applied in more environment.
In addition, existing display system volume is very much not portable, connects complexity, and needs external cable just can carry out content update, makes existing display system content update very not convenient.
Summary of the invention
Problem based on prior art exists the present invention proposes a kind of LED display system of using Bluetooth control, and it has low in energy consumption, wireless connections are easy to use, and need not cable is renewable contents, advantages such as quick customization, be applicable to outdoor advertising, safety indication, a plurality of fields such as information gathering output.
Description of drawings
Fig. 1 is system construction drawing of the present invention;
Fig. 2 is bluetooth module of the present invention and control system connection layout;
Fig. 3 is display module of the present invention and control system connection layout;
Fig. 4 is the present invention's topology diagram of powering;
Fig. 5 is external memory storage structure chart of the present invention;
Fig. 6 is display end software flow pattern of the present invention;
Fig. 7 is logical layered architecture figure of the present invention;
Fig. 8 is the overtime testing process figure of the present invention.
Embodiment
Hereinafter describe the preferred embodiments of the present invention with reference to the accompanying drawings in detail, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure that reaches technique effect can fully understand and implements according to this.
Need to prove that if do not conflict, each feature among the embodiment of the invention and the embodiment can mutually combine, all within protection scope of the present invention.In addition, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, though there is shown logical order in flow process, but can the technical solution problem not under the situation of influence technique effect at some, can carry out step shown or that describe with the order that is different from herein.
Fig. 1 is the structure chart of diagram whole system of the present invention.Whole system comprises two parts: hand-set host end and LED display client are designated hereinafter simply as mobile phone end and display end.The mobile phone end is mainly finished following function: generate pattern or character, reading displayed end state is also controlled; The display end major function is display pattern, gathers self (perhaps environment) state and feeds back to the mobile phone end.
Below introduce scheme and the design at two ends in detail:
The design of LED display end system
The LED display end needs following components to realize according to requirement of system design: control section, wireless transmission, display part, power unit, state acquisition part.
Control MCU
Because the function that need finish is few, and less demanding for autgmentability, and for stability, low-power consumption is had relatively high expectations, so control section the present invention does not adopt popular arm controller, but adopt 8 ATmega644PA system single-chip microcomputers of AVR company.Its major advantage is as follows:
System's dominant frequency is up to 20MHz, and instruction execution speed can reach 20MIPS;
There is multiple low power pattern to switch;
Integrated 8 path 10bit ADC, integrated two-way UART, TWI, multiple peripheral hardware such as SPI
The DRQFN encapsulation can fully reduce the space;
These characteristics have all fully satisfied the requirement of whole system.
Wireless transport module
What wireless transport module used is the HC-06 bluetooth module of wavesen company, and its key property comprises
Support bluetooth 2.0 versions
Meet mark HCI port (UART)
Low-cost
This bluetooth module uses UART to be connected with system, supports baud rate up to 115200bps, and it is connected as shown in Figure 2 with control system.
BT_RXD/BT_TXD is bluetooth and system communication serial ports, and BT_nRST is the bluetooth module reseting port, and BT_Status when it is in the pairing state, is output as the square wave of 50ms for the indication of bluetooth module state; When it is in connection status, be output as lasting high level.
It is before the connection of Bluetooth of mobile phone module is finished, and itself and single-chip microcomputer interactive interface are the AT pattern; And when its with Bluetooth pairing and be connected after, its function just is equivalent to transparent serial ports, can carry out data communication with the mobile phone end and disconnect up to link.When bluetooth module was in standby mode, the mobile phone that had matched can be directly sends picture to bluetooth module, and unpaired mobile phone need match earlier, and input correct PIN code (namely match password) can be matched.The appearance factory PIN code of this bluetooth module is " 1234 ", and its PIN code can be made amendment by send the AT instruction to bluetooth module.
Display module
Traditional dot matrix display, employing be the rank scanning mode.Under the smaller situation of screen, can adopt driving chips such as 74HC595 to finish control; But when the ranks number was many, for example 16x32 may need nearly tens to 20 driving control chips.This will produce several problems, and cabling can more complicated cause circuit reliability not high, and chip and cost of manufacture can uprise, and have increased the weight of the burden of singlechip control chip, and are unfavorable for the design of miniaturization and portability.In order to overcome above shortcoming, what the present invention selected for use is the AS1130LED dot matrix driving chip of Austrian Microtronic A/S (AMS).The Cross-Plexing mode that it adopts on type of drive can reduce the number of control line widely.Its basic principle is exactly on a line forward and oppositely and connect two LED lamps, and when the output forward voltage, the LED lamp of forward is bright, and when the output reverse voltage, reverse LED lamp is bright.The dot matrix of such 11x12 only needs 12 control lines and 1 control chip.And it can be finished such as flicker under the situation that does not take the mcu time, moves to left, and function such as move to right.
The present invention uses two AS1130 to form the 11x24 LED dot matrix demonstration of totally 264 points.Itself and MCU johning knot composition are as shown in Figure 3.The drive current of each LEDs can arrange separately, and being divided into from 0-30mA is 256 grades (8bit), and this makes.Single-chip microcomputer by the I2C interface with communicate.
Power-supply system
Whole system has 264 LEDs, but the lamp that moment lights simultaneously has only 22, and every LED lamp maximum drive current is 30mA, so its maximum current is about 660mA.Following table has been listed the general power consumption of each module:
System's power consumption is estimated
| Sequence number | Module | Power consumption (VDD=3.3V) |
| 1 | ATmega64 | 20mA |
[0042]?
| 2 | Bluetooth module | 50mA is in the |
| 3 | AS1130 | 340mA×2＝ |
| 4 | EEPROM | 2mA |
| ? | Amount to: | 700mA |
According to above estimation, the present invention only needs the Buck type DC to DC converter about 1A just can meet the demands.That the present invention selects is the AAT1145 of Analogic Tech company, and maximum output current is 1.5A, and outside needs a 22uFMLCC electric capacity.
During the design switch converters, because the current ratio of whole system is bigger, this electric current that just makes power supply ground (PGND) reflux is very big.Therefore need separate power supply ground (PGND) and simulation ground (AGND), then at system power supply input one point earth.
The power supply topological structure of system as shown in Figure 4.BT3V3 is the power supply for the HC-06 module for power supply, because bluetooth module when making amendment Password Operations, needs complete power down, to reach the purpose that empties memory internal.
Other hardware devices
External memory storage
Though ATmega644PA is the integrated inner EEPROM of 2Kbit, in order to improve character library and picture-storage capacity and follow-up code upgrade requirement, the present invention has still added the EEPROM of 64Kbit in the outside.That the present invention selects for use is the CAT24C64 of ON Semiconductor company, as shown in Figure 5.It uses the I2C interface to be connected with single-chip microcomputer, and maximum clock speed reaches 1MHz, and its chips A0, A2, A3 pin are I2C address choice pin.
Temperature and battery electric quantity collection
In order to detect ambient temperature, the present invention has added thermistor and has used MCU to carry ADC and carry out temperature acquisition; Simultaneously in order to guarantee cell voltage energy operate as normal and calculate dump energy that mcu uses bleeder circuit to detect cell voltage.
The GPS module
The longitude and latitude that the GPS module directly needs by serial ports output.Baud rate is 9600bps.
The display end Design of System Software
The software of display end is mainly finished following function:
System initialization
Communicate by letter with the mobile phone end
LED shows control
External status monitoring and control
The system initialization content of ATMega644PA mainly comprises: 1) system clock initialization, select the outer 16MHz clock of sheet; 2) external pin configuration: configuration PD2～PD3 is that UART interface and bluetooth module communicate, and PC0～PC1 is that the I2C interface is communicated by letter with AS1130; Related register initialization such as 3) interruption, timer/counter and FLASH.4) bluetooth module initialization is placed into the wait connection status to bluetooth module.
Fig. 6 shows the systems soft ware flow process.System is with the data that initiatively read in the inner specified address area of EEPROM after the initialization, and data are copied in the 4k internal memory, then these data are written among the AS1130, and then AS1130 gives LED dot matrix screen with dot array data and control dot matrix screen shows data.
Under common operating state, bluetooth module is in the pairing wait state.When Bluetooth of mobile phone initiatively matched, mobile phone just can successfully match after having only the input correct PIN code.After the successful matching, mobile phone uses software to send image data to bluetooth, and bluetooth module will receive data and write the EEPROM correspondence position by the I2C interface.MCU can be shown to the more new data that obtains on the LED dot matrix screen by AS1130 afterwards.
Because system not only needs to finish the function that shows the single width picture, and to finish and for example increase picture, the deletion picture, on/the following picture that turns over, mobile picture, functions such as flicker demonstration, this just need add the number order bag can realize above function in communication process.
When the data that send when the mobile phone end are not the picture bag, single-chip microcomputer receives data, be flag bit " 0x05 " if recognize the start bit of valid data, what this data packet transmission will be thought by system so is control command, namely controls brightness, speed, moving direction that LED shows.The form of control command can independently define.For example " 0x05 0x10 0x08 0x01 ", the meaning of representative is: " 0x05 " is the control flag bit, " 0x10 " control brightness (the brightness controlled range is 0x00-0xFF, and the 0x00 representative is extinguished, and the 0xFF representative is the brightest, and the more big brightness of numerical value is more high); " 0x08 " is used for controlling flash speed (control range 0x00-0x09, numeral is more big flash speed more slow); " 0x01 " is direction control bit (0x01 is moving direction to moving to left, and the 0x02 representative moves right, and the 0x00 representative stops).If the start bit of valid data is not " 0x05 ", will give tacit consent to this secondary data so is that LED shows the new picture that will show, system will deposit data in the eeprom address scope of appointment in order.
On this external communication protocol, display end is supported mobile phone end inquiry current state, current which width of cloth that is shown as for example, Current Temperatures, current battery electric quantity and current location etc.
Owing to the transmission unsteadiness of bluetooth, whole system is not unidirectional transmission system, needs display end to feed back contents such as state information in addition.This just needs the present invention to need to add more bag to guarantee stable transmission in transmission course.
Below be the communication protocol in the transmission course of the present invention:
Each transmission is all initiated by the mobile phone end, and communication data is paired " asking-reply " pattern.Replying overtime is 1 second.
The request bag thes contents are as follows:
【Re-sync】+【Type】+【Length】+【Rand】+＊＊＊Type?specific?data＊＊＊＊+【EOP】+【Rand】；
The LED display end is replied:
【ACK】+【Length/ESC】+＊＊＊Short?Data?if?Length≠0＊＊＊+【EOP】+【Rand】；
It is as follows to be equipped with the paragraph format implication in the bag:
[Re-sync] initiates bag for request, is a fixing bit pattern;
[EOP] represents the end of transmission for transmission ends bag;
[ACK] replys packet header for the LED display end;
Data length between [Length]=* * * is no more than 254
[Rand]=consistent in single is mutual, and for the random number of distinguishing distinct interaction
[Type]=[IMG] imports picture (static state or animation depend on frame number) into; Returning length is zero.
[SET] arranges parameter or modification information; Returning length is zero.
[GET] gets parms or configuration information; It is non-vanishing to return length.
Single is mutual when imperfect, is presented as the overtime of mobile phone end, will be dropped alternately and be initiated by mobile phone again.
The design of mobile phone end
The mobile phone end mainly is responsible for display end communication and user interface is provided, and the software of mobile phone end is mainly finished following function:
Pattern obtains and generates
Response user operation, the operation interface that display end is controlled
Other expansion modules
The protocol layer of communicating by letter with display end according to agreement
Function according to different levels is carried out layering logic layers when realizing, as shown in Figure 7.
Mobile phone end pattern obtains and generates
The pattern that display end shows can obtain from many aspects, get access to the pattern content in a different manner after, can show the preview effect and by operation pattern is sent to display end at the mobile phone end to show;
The calling mobile phone system interface obtains picture from cell phone multimedia message, network, local storage, what the modes such as multimedia message, network or local storage card by the mobile phone end got access to generally is the picture file of reference formats such as BMP, JPG, PNG, the user can be by scaling, cut out etc. and to form after the edit operation and LED shows dot matrix picture of the same size, the pixel value of corresponding points on the picture of reference format is reorganized into according to protocol format to meet the data that display end receives protocol format then;
Allow the manual input of character string of user, according to font file character string is changed into the height dot matrix BMP image highly identical with display end LED then, then the BMP image transitions that obtains is become to meet the data of display end reception protocol format;
Utilize handset touch panel, place the LED dot matrix screen of " simulation " at screen, the user can operate with finger and light or extinguish different LED points: when the LED of " simulation " dot matrix screen is in " drafting " state, the user points picture and crosses all of LED dot matrix of " simulation " and name a person for a particular job and light, when the LED of " simulation " dot matrix screen was in " wiping " state, the user pointed picture and crosses all of LED dot matrix of " simulation " and name a person for a particular job and extinguish; So just, can generate pattern easily;
Otherwise generate pattern, for example generate the data that meet display end reception protocol format in advance and preserve into corresponding form, after the mobile phone end is opened, can directly send to display end and show;
The control of mobile phone end interface alternation
The mobile phone end is controlled the display effect that interface energy makes things convenient for the user to carry out operations and control display end and can strengthen display end alternately;
Operate display end easily by gesture operation efficiently; Can define a series of gesture operation control display end, display pattern is sent to display end show as upwards pushing away, sliding left at the mobile phone end then makes display end show that pattern is moved to the left animation, and the display end that slides is to the right then showed the pattern animation that moves right; Double-click then display end and show flash animation etc.;
Strengthen the display effect of display end by mobile phone end interface, support left and right sides translation and flash animation as display end, support the switching between different images, but directly do not support frame animation, can make a series of continuous pattern sequences, in order each pattern is set to display end continuously then, continuous just the switching can show continuous animation effect between different images then;
Utilize the aspect sensor of mobile phone the inside and the motion state that acceleration transducer is known the user, the pattern that when the user goes ahead, shows " moving ahead ", show the left and right pattern that turns round when turning round when the user is left and right, when the user stops, show to stop pattern;
Utilizing mobile phone cam to detect user face also controls display end automatically automatically, the user can be chosen in when using mobile phone end control display end and open camera and aim at user face, camera is judged user's expression after detecting face, when winking one's left eye, the user shows pattern left, when blinking right eye, the user shows pattern to the right, when the user smiles, show the smile pattern, when the user frowns, show to stop pattern.
Other expansion modules
The mobile phone end communicates and can send different instructions to display end with display end, arranges to show image and different parameters, and can obtain data from display end; For example show the wide height of LED dot matrix, electric weight etc., because display end and mobile phone end adopt bluetooth to communicate, can send various types of data, when increasing other modules, display end also can obtain data by identical communication protocol exchange, as add the high accurate GPS module at display end, can read current latitude and longitude information from display end when being connected to the mobile phone end and navigate;
Mobile phone end protocol layer is realized
The mobile phone end is communicated by letter with display end and mainly comprised to display end and send instruction and receive the information that display end returns, and mainly is divided into: instruction sends, mobile phone end monitoring reception display end data and overtime detection;
The instruction process of transmitting is that all kinds of instructions are encapsulated, and when upper strata mobile phone end sends instruction to display end, records current system time during command execution, uses for follow-up overtime detection;
Overtime detection detects all, and whether the instruction of return data is not overtime, the time of record compares when sending according to current time of system and instruction during detection, if overtime, then upwards sends time-out information, otherwise carry out overtime detection next time, idiographic flow such as Fig. 8 illustrate;
Whether the mobile phone end is applied in opens background thread after the bluetooth successful connection and monitors display end always and have data to send over; Restart to wrap the data parsing if receive data that do not have [ACK] instruction of escape then receive before abandoning, form a complete respond packet if receive data, then send message to the upper strata and notify, flow process such as Fig. 8 illustrate.
Claims (10)
1. hand-set host end that is used for based on blue teeth wireless control display system, described blue teeth wireless control display system also comprises the LED display client, it is characterized in that: described hand-set host end generates picture or character, send to described display client by hand-set host end bluetooth module, and the state that reads described display client feedback is further controlled realizing to display client.
2. hand-set host end as claimed in claim 1, described display client comprises control module, wireless transport module, display module, power module, state acquisition module, external memory storage, GPS module; Particularly, described control module adopts 8 single-chip microcomputers of low-power consumption; Described wireless transport module adopts bluetooth module; Described display module adopts the LED dot matrix that drives in the Cross-Plexing mode to drive chip; It is the power module of 1.5A that described power module adopts maximum output current; Described state acquisition module is used for gathering described LED display client state in order to feed back to described hand-set host end, and this state acquisition module comprises thermistor and bleeder circuit; Wherein, described thermistor is used for carrying out temperature acquisition; Described bleeder circuit is for detection of cell voltage; Described external memory storage adopts the EEPROM of 64Kbit; Described GPS module is used for the output longitude and latitude to realize the location.
3. hand-set host end as claimed in claim 2, further comprise, under common operating state, the bluetooth module of described display client is in the pairing wait state, when the bluetooth module of described hand-set host end initiatively matched, described hand-set host end could successfully match after having only the input correct PIN code; After the successful matching, described display client writes described external memory storage correspondence position with data by the I2C interface after described hand-set host termination is received multi-medium data, and described control module is shown to these data on the LED dot matrix screen by described display module.
4. hand-set host end as claimed in claim 3, described system can also realize control LED display brightness, display speed, moving direction by self-defined control command form; And the increase picture, the deletion picture, on/turn over picture down, flicker shows.
5. hand-set host end as claimed in claim 2, the communication data in the described system is paired request-answer-mode, replying overtime is 1 second; Wherein, the request bag of hand-set host end is:
[Re-sync]+[Type]+[Length]+[Rand]+* * * Type specific data***+[EOP]+[Rand]; The response packet of LED display client is:
【ACK】+【Length/ESC】+***Short?Data?if?Length≠0***+【EOP】+【Rand】：
Each paragraph format implication is as follows in the bag:
[Re-sync] initiates bag for request, is a fixing bit value;
[EOP] represents the end of transmission for transmitting by bag;
[ACK] replys packet header for the LED display end;
[Length] is the data length between the * * *, is no more than 254;
[Rand] is consistent in single is mutual, and is used for distinguishing the random number of distinct interaction;
When [Type] is [IMG], import picture into, static state or animation depend on frame number, and returning length is zero;
When [Type] is [SET], parameter or modification information are set; Returning length is zero;
When [Type] is [GET], get parms or configuration information; It is non-vanishing to return length;
[ESC] is 0xFF, and when comprising [Re-sync] in the data, this moment, cell-phone customer terminal will adjust accordingly length, namely deducted [ESC];
Single is mutual when imperfect, is presented as the overtime of hand-set host end, will be dropped alternately and be initiated by mobile phone again.
6. hand-set host end as claimed in claim 1, described hand-set host end comprises that mutual control connects face, the user can utilize efficiently gesture operation operation display client by this mutual control interface; Particularly, upwards push away and display pattern is sent to display client show; Slide left and make display client show that pattern is moved to the left animation; Slide to the right and make display client show the pattern animation that moves right; Double-click makes display client show flash animation.
7. hand-set host end as claimed in claim 1, described hand-set host end comprises aspect sensor and acceleration transducer, it all for perception user's motion state, shows the relational pattern that moves ahead when the user goes ahead; When a user left side/turning right shows a left side/curved relational pattern of turning right when bending; When the user stops, showing and stop relational pattern; And the hand-set host end sends to display client with these relational pattern automatically.
8. hand-set host end as claimed in claim 1, described hand-set host end comprises photographing module, described photographing module is for detection of user face and automatically described display client is controlled; Particularly, the user opens photographing module and aims at face, and described photographing module is judged user's expression after detecting face, shows relational pattern left when the user winks one's left eye; When blinking right eye, the user shows relational pattern to the right; When smiling, the user shows the smile relational pattern; When the user frowns, show and stop relational pattern; And the hand-set host end sends to display client with these relational pattern automatically.
9. hand-set host end as claimed in claim 6, described hand-set host end can also allow the user manually import picture or character string except obtaining picture or the character string from network or local storage; Particularly, utilize described mutual control interface at the hand-set host end, the LED dot matrix screen of a simulation display client display screen is set at described mutual control interface, the user lights with finger manipulation or extinguishes the different LED point to generate picture or character string.
10. hand-set host end as claimed in claim 2, described hand-set host end can obtain the current latitude and longitude information of display client step of going forward side by side from the display client that has connected and navigate.
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| CN106488395B (en) * | 2016-11-28 | 2019-09-27 | 石狮市森科智能科技有限公司 | A kind of LED display methods based on Bluetooth transmission protocol |
| CN110446189A (en) * | 2018-05-04 | 2019-11-12 | 深圳市冠旭电子股份有限公司 | Bluetooth equipment shows control method, device and the terminal device of state |
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