CN103247263A - Key input LED (Light-Emitting Diode) Chinese character display system having wireless communication function - Google Patents

Abstract

The invention discloses a key input LED (Light-Emitting Diode) Chinese character display system having a wireless communication function based on an ATmega16 singlechip, belonging to an industrial automatic product. The key input LED Chinese character display system mainly comprises a 4*4 key input circuit, a wireless communication transmitting end control circuit, a wireless communication transmitting circuit, a wireless communication receiving circuit, a Chinese character display control circuit, a driving circuit and a 16*16 LED display screen. Zone bit codes of Chinese characters required to be displayed are input via 4*4 key, and wireless communication is performed; and meanwhile, corresponding Chinese character font codes are computed under the action of the control circuit, and are further displayed on the 16*16 LED display screen. Due to the adoption of the system, the defects that contents displayed by the LED display screen can only be changed by writing and downloading programs in the prior art are overcome, the displayed Chinese characters can be changed at any time, the flexibility of each part of the system is enhanced greatly, the complexity and difficulty of wiring and maintenance by operating personnel are lowered, the operating personnel is prevented from entering a dangerous operating environment, and the safety of the operating personnel is guaranteed.

Description

A kind of button input LED Chinese-character display system with radio communication function

Technical field

The present invention is based on the monolithic processor controlled LED Chinese-character display system that has the button input function and can carry out radio communication of ATmega16 of atmel corp, belongs to the industrial automation product.

Background technology

Present most of LED Chinese-character display system is the real-time input system of Chinese character that needs can not be shown, mainly the Hanzi font sign indicating number is programmed in the program, rely on data line that program is downloaded to control chip, this mode time and effort consuming, not only need the download equipment of specialty, and require the user to have higher computer program to write ability.In addition, input equipment had both needed to be connected with LED display by lead, needed to be each LED display assembly information input equipment again, and the dirigibility that has reduced system's each several part has also caused the waste of resource.Simultaneously, some LED display is placed on higher or comparatively remote place, position, and the programming personnel need bear bigger life danger when operating.

Summary of the invention

Goal of the invention:

Purpose of the present invention mainly contains three: one, make the LED Chinese-character display system can realize information input freely, technology with the advanced person substitutes out-of-date manually-operated, not only save human resources greatly, and allowed more user to show Chinese character in LED display as required; Two, the situation of avoiding operating personnel to operate to the danger position scene, protection personnel's life security; Three, make an information input equipment can control a plurality of LED display, economize on resources, reduce the investment of equipment and the dirigibility of increase system each several part.

Technical scheme of the present invention is achieved in that

Total system comprises 4 * 4 button inputting circuits, radio communication transmitting terminal control circuit, radio communication transtation mission circuit, radio communication receiving circuit, Chinese character display control circuit, driving circuit, 16 * 16LED display screen and related software composition.Wherein constitute button input and radio communication transmission subsystem by 4 * 4 button inputting circuits, radio communication transmitting terminal control circuit, radio communication transtation mission circuit three parts, constitute radio communication by radio communication receiving circuit, Chinese character display control circuit, driving circuit, 16 * 16LED display screen, four parts and receive and the Chinese character display subsystem.4 * 4 button inputting circuits by 4 row, 4 row totally 16 buttons constitute, can be when having button to press the key information of relevant position be outputed in the radio communication transmitting terminal control circuit, realize the function of input Hanzi section-position code in the system.Radio communication transmitting terminal control circuit is made of ATmega16 single-chip microcomputer and clock, peripheral circuit such as reset, and is the core that button input and radio communication send subsystem, can judge whether that button presses by the mode of continuous inquiry.When button was pressed, the ATmega16 single-chip microcomputer was eliminated dithering process by the information to 4 * 4 button inputting circuits output, and whether judge be that effective button is pressed.When determining that effective button is pressed, the ATmega16 single-chip microcomputer calculates corresponding button value, is about to that it corresponds to 0,1,2,3,4,5,6,7,8,9, A, B, C, D, E numerical value.The ATmega16 single-chip microcomputer outputs to the radio communication transtation mission circuit by the SPI serial communication interface with the button value data that obtain then.The radio communication transtation mission circuit constitutes based on the nRF24L01+ chip, and the data that radio communication transmitting terminal control circuit can be sent by the SPI serial communication send by radio communication.The radio communication receiving circuit also is based on the nRF24L01+ chip and constitutes, and can receive the button value data of radio communication transtation mission circuit emission, and this signal is delivered in the Chinese character display control circuit by the SPI serial communication interface.The Chinese character display control circuit still is based on the ATmega16 single-chip microcomputer and constitutes, and have clock, peripheral circuit such as reset, it is the core of radio communication reception and Chinese character display subsystem, can make corresponding processing according to the key assignments data that receive: if key assignments is in 0,1,2,3,4,5,6,7,8,9 any one, the ATmega16 single-chip microcomputer is recorded in the level Four data with current key value and receives in the buffer memory storehouse; If key assignments is the B(cls), ATmega16 single-chip microcomputer output data make 16 * 16LED display screen not show any content; If key assignments is among C, D, the E any one, the ATmega16 single-chip microcomputer is considered as it invalid and ignores this data; Stop if key assignments is A() or the level Four data of single-chip microcomputer receive the buffer memory storehouse and overflow, the ATmega16 single-chip microcomputer goes out the font sign indicating number of corresponding Chinese character and outputs to driving circuit by the SPI serial communication according to the data computation that the level Four data receive in the buffer memory storehouse, and the Chinese character of control 16 * 16LED display screen shows.Driving circuit constitutes based on the 74HC595 chip, and the serial font code data with the output of ATmega16 single-chip microcomputer converts the parallel signal that can control the LED demonstration on the one hand, offers the required electric energy of LED display operate as normal in addition on the one hand.Four 74HC595 chip cascades together, row or the LED of delegation that its each parallel output pin is connecting 16 * 16LED display screen controlling the opening and turn-offing of LED of the corresponding row or column of 16 * 16LED display screen.

In order to take chip pin less as far as possible, when showing, adopt the mode of dynamic scan, only control opening and turn-offing of a row LED at every turn, the output pin of the 74HC595 of respective column is high level at this moment, the 74HC595 chip pin output that is connected each row LED shows the font sign indicating number of this column information, show next column after time-delay a period of time, show Chinese character by column scan like this.Utilize human eye to exist of short duration vision to stop, when showing, pass through the interruption of the timer generation of ATmega16 single-chip microcomputer inside sweep frequency is controlled at 25Hz.

Native system is writing of the relative program finished under the AVR Studio programmed environment of atmel corp exploitation, makes system have by radio communication and demonstrates the ability of corresponding Chinese character according to the region-position code of button input.

Owing to take technique scheme, make the present invention replace to change by software programming the mode of the Chinese character of LED display demonstration fully in the past, not only greatly reduce working strength of workers, also reduced the injury that the operator may be subjected to the programming of the LED display that is positioned over hazardous environment the time.Simultaneously, expanded the writing style that can be presented at the Chinese character on the LED greatly.In addition, carry out the transmission of data owing to use radio communication, greatly improved the dirigibility of system's each several part, can use the input of button and the radio communication to send a plurality of LED display of subsystem controls, reduced system at line and the complexity when safeguarding in economize on resources, cut the waste.

Description of drawings

Fig. 1 is one-piece construction synoptic diagram of the present invention

Fig. 2 is that button input of the present invention and radio communication send the subsystem structure synoptic diagram

Fig. 3 is that radio communication of the present invention receives and Chinese character subsystem configuration synoptic diagram

Fig. 4 is 4 * 4 button inputting circuits figure of the present invention

Fig. 5 is 16 * 16LED display screen circuit diagram of the present invention

Fig. 6 is ATmega16 single-chip microcomputer clocking scheme of the present invention

Fig. 7 is ATmega16 reset circuit of SCM figure of the present invention

Fig. 8 is nRF24L01+ chip power circuit diagram of the present invention

Mark: 1-1,4 * 4 button inputting circuits; 1-2, based on the radio communication transmitting terminal control circuit of ATmega16 single-chip microcomputer; 1-3, based on the radio communication transtation mission circuit of nRF24L01+ chip; 1-4, based on the radio communication receiving circuit of nRF24L01+ chip; 1-5, based on the Chinese character display control circuit of ATmega16 single-chip microcomputer; 1-6, based on the driving circuit of 74HC595 chip; 1-7,16 * 16LED display screen; 6-1,12MHz crystal oscillator; 8-1, LM1117-3.3 voltage stabilizing chip.

Embodiment

Total system comprises 4 * 4 button inputting circuits (1-1), radio communication transmitting terminal control circuit (1-2), radio communication transtation mission circuit (1-3), radio communication receiving circuit (1-4), Chinese character display control circuit (1-5), driving circuit (1-6), 16 * 16LED display screen (1-7), eight parts composition.Wherein constitute button input and radio communication transmission subsystem by 4 * 4 button inputting circuits, radio communication transmitting terminal control circuit, radio communication transtation mission circuit three parts, constitute radio communication by radio communication receiving circuit, Chinese character display control circuit, driving circuit, 16 * 16LED display screen, four parts and receive and the Chinese character display subsystem.ATmega16 single-chip microcomputer in radio communication transmitting terminal control circuit (1-2), the Chinese character display control circuit (1-5) also need to be correlated with peripheral circuit---clock circuit and reset circuit guarantee its operate as normal.NRF24L01+ chip in radio communication transtation mission circuit (1-3), the radio communication receiving circuit (1-4) needs LM1117-3.3 chip general+5V voltage transitions one-tenth+3.3V power supply to guarantee its operate as normal when work.Simultaneously, because ATmega16 single-chip microcomputer pin output voltage is+5V to damage the 2k Ω resistance of connecting respectively in order the nRF24L01+ chip not to be produced when line.

4 * 4 button inputting circuits are made of 4 row, 4 row buttons, each row or each row link together by lead and are connected with the PA mouth of ATmega16 single-chip microcomputer in the radio communication transmitting terminal control circuit respectively, can be when having button to press the key information of relevant position be outputed in the radio communication transmitting terminal control circuit, realize the function of input Hanzi section-position code in the system.The ATmega16 single-chip microcomputer is constantly exported high level to each row button (H1, H2, H3, H4) of 4 * 4 button inputting circuits successively, constantly inquire about the input voltage situation of each row (L1, L2, L3, L4) simultaneously, when importing, high level then judges have button to press, after eliminating dithering process, can calculate corresponding button value according to high level in situation of each row and each row, be about to that it corresponds to 0,1,2,3,4,5,6,7,8,9, A, B, C, D, E, F numerical value.Radio communication transmitting terminal control circuit mainly is made of ATmega16 single-chip microcomputer and clock, peripheral circuit such as reset, it is the core that button input and radio communication send subsystem, key assignments when the working condition that can constantly inquire about 4 * 4 button inputting circuits judges whether that button is pressed and calculated button and presses outputs to the radio communication transtation mission circuit by the SPI serial communication interface with the button value data then.The radio communication transtation mission circuit constitutes based on the nRF24L01+ chip, and its 3rd, 4,5,2,6,1 pin links to each other with the 8th, 7,6,5,16,4 pins of ATmega16 single-chip microcomputer by 2k Ω resistance with lead respectively.Wherein the clock signal that provides of SPI communication is provided the 8th pin of ATmega16 single-chip microcomputer, and the 5th pin determines when in running order the nRF24L01+ chip is, and the 4th pin determines the mode of operation of nRF24L01+ chip.Will be after the configuration register of nRF24L01+ chip and receiving node address setting be finished after the ATmega16 single-chip microcomputer has obtained effective button value data, corresponding data are passed to the nRF24L01+ chip by SPI communication, set the 4th pin then and be high level and continue 10us with on start emission.The nRF24L01+ chip is according to the difference of the situation of transmission---and whether receive answer signal or repeating transmission number of times and reach the corresponding interruption of maximal value generation, and the response of the 16th pin application by the ATmega16 single-chip microcomputer, the ATmega16 single-chip microcomputer is according to circumstances made corresponding processing.The button value data send successfully back ATmega16 single-chip microcomputer the 4th pin and are set to 0, and the 1st pin of nRF24L01+ chip is dragged down, and make the nRF24L01+ chip enter holding state.The radio communication receiving circuit also is based on the nRF24L01+ chip and constitutes, and can receive the button value data-signal of radio communication transtation mission circuit emission, and these data are delivered in the Chinese character display control circuit by the SPI communication interface.The Chinese character display control circuit still is based on the ATmega16 single-chip microcomputer and constitutes, and have clock, peripheral circuit such as reset.The 3rd, 4,5,2,6,1 pin of radio communication receiving circuit nRF24L01+ chip links to each other with the 8th, 7,6,5,16,4 pins of ATmega16 single-chip microcomputer in the Chinese character display control circuit by 2k Ω resistance with lead respectively.Wherein the clock signal that provides of SPI communication is provided the 8th pin of ATmega16 single-chip microcomputer in the Chinese character display control circuit, and the 5th pin determines when in running order the nRF24L01+ chip is, and the 4th pin determines the mode of operation of nRF24L01+ chip.When using, after ATmega16 single-chip microcomputer in the Chinese character display control circuit is finished the nRF24L01+ chip configuration register of radio communication receiving circuit and address setting by SPI communication, make the 4th pin output 1, the 1st pin of radio communication receiving circuit nRF24L01+ chip is drawn high, started the receiving mode of nRF24L01+ chip.Behind the time-delay 130us, the nRF24L01+ chip begins to detect air information.The nRF24L01+ chip stores data in the corresponding register into after receiving the active data bag, and its 6th pin dragged down, the 16th pin application by ATmega16 single-chip microcomputer in the Chinese character display control circuit is interrupted, and meanwhile sends automatic confirmation signal.At first drag down the 1st pin of nRF24L01+ chip during underway disconnected handle of Chinese character display control circuit ATmega16 single-chip microcomputer by the 4th pin output 0, make it work in standby mode I, read the button value data that receive by the SPI serial line interface then, and make the nRF24L01+ chip be ready to enter again receiving mode.The Chinese character display control circuit is made corresponding processing after receiving effective button value data: if key assignments is in 0,1,2,3,4,5,6,7,8,9 any one, the ATmega16 single-chip microcomputer is recorded in the level Four data with current key value and receives in the buffer memory storehouse; If key assignments is the B(cls), ATmega16 single-chip microcomputer output data make 16 * 16LED display screen not show any content; If key assignments is among C, D, E, the F any one, the ATmega16 single-chip microcomputer is considered as it invalid and ignores this data; Stop if key assignments is A() or the level Four data of single-chip microcomputer receive the buffer memory storehouse and overflow, the ATmega16 single-chip microcomputer goes out the font sign indicating number of corresponding Chinese character and outputs to driving circuit by the SPI serial communication according to the data computation that the level Four data receive in the buffer memory storehouse, and the Chinese character of control 16 * 16LED display screen shows.Driving circuit constitutes based on the 74HC595 chip, and the serial font code data with the output of ATmega16 single-chip microcomputer converts the parallel signal that can control 16 * 16LED demonstration on the one hand, offers the required electric energy of 16 * 16LED display screen operate as normal in addition on the one hand.Four 74HC595 chip cascades together, row or the LED of delegation that its each parallel output pin is connecting 16 * 16LED display screen controlling the opening and turn-offing of LED of the corresponding row or column of 16 * 16LED display screen.The 11st, 12,13,10 pins of four 74HC595 chips all are connected with the 1st, 39,38,37 pins of ATmega16 single-chip microcomputer respectively.Directly receive from the 14th pin of the 74HC595 chip of ATmega16 single-chip microcomputer serial data and the 15th pin of ATmega16 single-chip microcomputer and be connected, and with other three 74HC595 chips by its serial delivery outlet namely the 9th pin carry out cascade.The ATmega16 single-chip microcomputer is by the 15th pin serial output data, by the 1st pin output synchronous clock.Under the control of synchronous clock, data are shifted in the 74HC595 chip.After data sent and to finish, the ATmega16 single-chip microcomputer produced the electrical level rising edge by the 39th pin, makes the data in the 74HC595 chip latch shift register and it is reflected on the parallel output pin.Thereby the 38th pin of ATmega16 single-chip microcomputer output 0 makes the 74HC595 chip normally export data.During operate as normal, the 37th pin of ATmega16 single-chip microcomputer output high level.When needs reset to the 74HC595 chip, the 37th pin of ATmega16 single-chip microcomputer output high level.

In order to take chip pin less as far as possible, when showing, adopt the mode of dynamic scan, only control opening and turn-offing of a row LED at every turn, the parallel output pin of the 74HC595 of respective column is high level at this moment, the parallel output pin of 74HC595 chip that is connected each row LED shows the font sign indicating number of this column information, show next column after time-delay a period of time, show Chinese character by column scan like this.16 * 16LED display screen is lighted the LED of relevant position after the parallel control information that receives driving circuit.Utilize human eye to exist of short duration vision to stop, when showing, pass through the interruption of the timer generation of ATmega16 single-chip microcomputer inside sweep frequency is controlled at 25Hz.

Beneficial effect:

The present invention can be placed on the exposed to contact place of operator with button input and the radio communication transmission subsystem that is made of 4 * 4 button inputting circuits (1-1), radio communication transmitting terminal control circuit (1-2), radio communication transtation mission circuit (1-3) three parts when practical application, can make operating personnel show required Chinese character as required at any time and do not need to revise program in the single-chip microcomputer, greatly simplify operating process and labour intensity.Need be placed under the situation higher or comparatively dangerous place of position in LED display, this operator scheme can avoid making operating personnel to enter dangerous operating environment, the possibility that the minimizing personnel come to harm.Simultaneously, the present invention can use a button input and radio communication to send subsystem and control a plurality of LED display, has greatly increased the dirigibility of each several part in the system, has reduced the investment to equipment, has saved resource.In addition, the use of communication has greatly reduced complexity and the degree of difficulty of system wiring and maintenance, is convenient to using and managing of operating personnel more.

Claims (7)

1. the button with radio communication function is imported the LED Chinese-character display system, comprise 4 * 4 button inputting circuits, radio communication transmitting terminal control circuit, radio communication transtation mission circuit, radio communication receiving circuit, Chinese character display control circuit, driving circuit, seven parts of 16 * 16LED display screen, it is characterized in that: described 4 * 4 button inputting circuits, radio communication transmitting terminal control circuit, three parts of radio communication transtation mission circuit have been formed the button input and radio communication sends subsystem; Radio communication receiving circuit, Chinese character display control circuit, driving circuit, 16 * 16LED display screen, four parts have been formed radio communication and have been received and the Chinese character display subsystem.

2. a kind of button with radio communication function according to claim 1 is imported the LED Chinese-character display system, it is characterized in that: described 4 * 4 button inputting circuits by 4 the row, 4 row totally 16 buttons constitute, can be when having button to press the key information of relevant position be outputed in the radio communication transmitting terminal control circuit, realize the function of input Hanzi section-position code in the system; Radio communication transmitting terminal control circuit constitutes based on the ATmega16 single-chip microcomputer, can eliminate dithering process to the information of 4 * 4 button inputting circuits output, and after effectively button is pressed, calculate corresponding button value, and then output to the radio communication transtation mission circuit by the SPI serial communication; The radio communication transtation mission circuit constitutes based on the nRF24L01+ chip, the button value from the input of radio communication transmitting terminal control circuit can be sent by electromagnetic wave; The radio communication receiving circuit also is based on the nRF24L01+ chip and constitutes, and can receive the button value that the radio communication transtation mission circuit sends, and sends in the Chinese character display control circuit by the SPI serial communication; The Chinese character display control circuit still constitutes based on the ATmega16 single-chip microcomputer, can after handling accordingly from the button value of radio communication receiving circuit the Hanzi font code data that calculates be sent to driving circuit by synchronous serial communication; Driving circuit constitutes based on the 74HC595 chip, can convert the serial font code data of Chinese character display control circuit output to drive 16 * 16LED display screen parallel data; 16 * 16LED display screen is listed as by 16 row, 16, and totally 256 LED form.

3. a kind of button with radio communication function according to claim 1 is imported the LED Chinese-character display system, it is characterized in that: described radio communication transmitting terminal control circuit, Chinese character display control circuit all are based on the digital processing system of ATmega16 single-chip microcomputer, need external clock circuit and reset circuit when work.

4. a kind of button with radio communication function according to claim 1 is imported the LED Chinese-character display system, it is characterized in that: the anode of each row LED of 16 * 16LED display screen is connected by lead with the parallel output pin of the 74HC595 chip of driving circuit respectively, and 16 row need two 74HC595 chips altogether; The negative electrode of each row LED is connected by lead with the parallel output pin of the 74HC595 chip of driving circuit respectively, and 16 row need two 74HC595 chips altogether.

5. a kind of button with radio communication function according to claim 1 is imported the LED Chinese-character display system, it is characterized in that: the Chinese character display control circuit by the 15th pin serial output data of ATmega16 single-chip microcomputer, is exported synchronizing clock signals by the 1st pin to driving circuit synchronous serial output data the time.

6. a kind of button input LED Chinese-character display system with radio communication function according to claim 1 is characterized in that: the SPI serial communication interface that uses the ATmega16 single-chip microcomputer when communicating between described radio communication transmitting terminal control circuit and radio communication transtation mission circuit, Chinese character display control circuit and the radio communication receiving circuit.

7. a kind of button input LED Chinese-character display system with radio communication function according to claim 1 is characterized in that: described radio communication transtation mission circuit, radio communication receiving circuit need by by LM1117-3.3 chip general+5V voltage transitions for+3.3V voltage and electric energy is provided.

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