CN102129790A - Electronic teaching board - Google Patents
Electronic teaching board Download PDFInfo
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- CN102129790A CN102129790A CN 201110066968 CN201110066968A CN102129790A CN 102129790 A CN102129790 A CN 102129790A CN 201110066968 CN201110066968 CN 201110066968 CN 201110066968 A CN201110066968 A CN 201110066968A CN 102129790 A CN102129790 A CN 102129790A
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Abstract
The invention relates an electronic teaching board. The electronic teaching board is provided with a microprocessor which is connected with a power supply and a memory; the microprocessor is connected with an input part; the microprocessor is connected with a scanning drive circuit of an output part; and the scanning drive circuit is connected with a light-emitting diode (LED) display output device. In the teaching board, teaching information contents are input into the microprocessor through an input key or/and a touch screen input device; the related teaching information contents are displayed through the LED display output device connected with the scanning drive circuit; original handwriting can be stored at any time and stored data can be called out at any time; the handwriting can be modified randomly without corollary equipment such as a projector, a computer and the like; simultaneously LED lamps with different colors and a multi-color LED lamp are adopted for displaying; and the electronic teaching board has the advantages of simple structure, economics, environment friendliness, long service life, and convenience and safety for operation, and is an image device which is suitable for the places such as office meeting, school teaching and the like.
Description
Technical field
The invention belongs to the teaching aid technical field, relate to a kind of with the education informations content by the input button or/and the touch-screen input media is input in the microprocessor, show that by LED that scan drive circuit connected output unit shows the electronic instruction plate of relevant education informations content again.
Background technology
Adopt computer to add projector at present mostly and impart knowledge to students, utilize projector that the represented image of picture signal of input is presented on the screen that is throwed enlargedly.Descend but drop shadow effect can occur after the long-term use of projector, projector equipment costs an arm and a leg simultaneously, and the use place of requirement is big, the failure rate height, and operation and maintenance is all very difficult.
A kind of interactive electric whiteboard is arranged on the existing market, but this interactive electric whiteboard has only single electronic pen writing function, needs stent support during use, support takes up room greatly, influences the attractive in appearance of classroom or meeting room.
Summary of the invention
For overcoming above-mentioned technical disadvantages, the invention provides a kind of environmental protection simple in structure, economic, long service life, easy and safe to operate, can be at any time the data of preservation, the electronic instruction plate that can revise person's handwriting arbitrarily, need not peripheral equipment, adopt the LED lamp of different colours to show are preserved and accessed to former person's handwriting.
The present invention solves the technical method that its technical matters adopts: a kind of electronic instruction plate, one microprocessor that is connected with power supply and storer is arranged, microprocessor is connected with the importation, the scan drive circuit of this microprocessor and output links, and scan drive circuit is connected with LED and shows output unit.
Described importation is for importing button or/and the touch-screen input media.
Described importation is finished by the four-wire ohm touch-screen, and the one, the X coordinate obtains: earlier with the software design signal IO mouth PC1 (X-) of microprocessor U5 is put 0 (low level), PC3 (X+) puts 1 (high level); Make the two ends (X-, X+ port) of touch-screen add 5V voltage, the PC0 mouth is changed to input state, the PC2 mouth is changed to A/D (mould/number) input state, and when touch-screen was touched by external object, the Y+ of touch-screen can pass the PC2 port that a corresponding aanalogvoltage is given microprocessor U5; Microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC2 port then, draws the Y coordinate position after calculation process;
The 2nd, the Y coordinate obtains: earlier with the software design signal IO mouth PC0 (Y-) of microprocessor U5 is put 0 (low level), PC2 (Y+) puts 1 (high level); Make the two ends (Y-, Y+ port) of touch-screen add 5V voltage, the PC1 mouth is changed to input state, the PC3 mouth is changed to A/D (mould/number) input state, and when touch-screen was touched by external object, the X+ of touch-screen can pass the PC3 port that a corresponding aanalogvoltage is given microprocessor U5; Microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC3 port then, draws the X coordinate position after calculation process.
Described output is made up of row, column sweep circuit, driving circuit and LED display circuit:
The one, column scan has 74HC154 (4 lines-16 line code translator), driving circuit Q1 to drive triode, resistance R 65--R125, R92--R111, R82--R85 and LED display circuit to Q32, and the course of work is as follows:
Microprocessor U5 gives address gating signal of 74HC154, allows 74HC154 gating one tunnel, and to drive the LED of respective column luminous by driving triode then; As the IO of microprocessor U5 mouth PD0, PD1, PD2, when PD3 all is high level, four road signals are passed to the address strobe inlet of 74HC154 through R82, R83, R84, R85; When 74HC154 received the address strobe binary signal (1111) of microprocessor U5, it was that low level is effective that 74HC154 is strobed into the 17th pin with address signal, and remaining the 1st to the 11st pin, the 13rd to the 16th pin are that high level is invalid; Low level process R111 is pulled to low level with the base stage of Q31 triode, makes the collector cut-off of Q31, and electric current is added to the Q32 transistor base by R124, R125, makes C, the conducting of the E utmost point of Q32 triode; Make the LED anode of respective column add the 5V power supply;
The 2nd, line scanning is made up of to R64 microprocessor U1, U2, U3, U4 and R1, and (working method of microprocessor U1, U2, U3, U4 is the same, is example explanation circuit theory here with U1, is called the line-scan circuit principle), the course of work is as follows:
When the anode of corresponding certain row LED has all added the 5V power supply, the plus earth that it is corresponding, there then have electric current to flow through LED to be luminous, and R1 is the current-limiting resistance of LED to R16; The LED of respective column went out entirely when the I/O mouth PB0 of U1 was high level to PB7, PD0 to PD7 as can be known by circuit, and respective column LED is bright full during for low level; After microprocessor U5 collects touch screen signal, this moment, the touch-screen touched point was a low level, send I/O mouth PC0, PC1, PC2, the PC3 of U1 to by I/O mouth PD4, PD5, PD6, the PD7 of U5, U1 composes the data message received to the I/O mouth PB0 of U1 to PB7 port and PD0 to the PD7 port by the certain calculation logic then, the level of corresponding port changes, here have only two kinds of high-low levels, height is VCC, and low is 0V;
The VR1 of described power supply is 7805 (three-terminal voltage-stabilizing 5V), and C6 is the filter capacitor of power input, and C5 is a high-pass filtering electric capacity, and C7 is the filter capacitor of input end, and C8, C9, C10, C12, C13, C14 are the high-pass filtering electric capacity of 5V output.
C1, C2, C3, C4, C11 be U1, U2, U3, U4, U5 must the distribution road.
The invention has the beneficial effects as follows: with the education informations content by the input button or/and the touch-screen input media be input in the microprocessor, show that by the LED that scan drive circuit connected output unit shows relevant education informations content again, can preserve and access at any time the data of being preserved to former person's handwriting at any time, can revise person's handwriting arbitrarily, need not support equipments such as projector and computer, adopt the LED lamp and the multi-colored led lamp of different colours to show simultaneously, have simple in structure, economic environmental protection, long service life and advantage easy and safe to operate are the device for image in places such as a kind of suitable office meeting and school instruction.
Description of drawings
Fig. 1 is a frame structure synoptic diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Referring to Fig. 1, a kind of electronic instruction plate has microprocessor, microprocessor is connected with storer, microprocessor is connected with the input button or/and the touch-screen input media, and this microprocessor and scan drive circuit link, and scan drive circuit is connected with LED demonstration output unit.In an embodiment, microprocessor employing U1-U5 model is that the ATmega8L-8AI serial connection forms; LED shows that output unit adopts the P1 to P64 of 17 pin to carry out series, parallel or/and the mode of series-parallel connection combines, and adopts the LED lamp of different colours simultaneously, as white, blue and/or yellow, and multi-colored led lamp, show as 2 looks and/or 3 colored lights.
Referring to Fig. 2, the importation is finished by the four-wire ohm touch-screen, under the concrete course of work:
The one, the X coordinate obtains: earlier with the software design signal IO mouth PC1 (X-) of microprocessor U5 is put 0 (low level), PC3 (X+) puts 1 (high level).Make the two ends (X-, X+ port) of touch-screen add 5V voltage, the PC0 mouth is changed to input state, the PC2 mouth is changed to A/D (mould/number) input state, and when touch-screen was touched by external object, the Y+ of touch-screen can pass the PC2 port that a corresponding aanalogvoltage is given microprocessor U5.Microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC2 port then, draws the Y coordinate position after calculation process.
The 2nd, the Y coordinate obtains: earlier with the software design signal IO mouth PC0 (Y-) of microprocessor U5 is put 0 (low level), PC2 (Y+) puts 1 (high level).Make the two ends (Y-, Y+ port) of touch-screen add 5V voltage, the PC1 mouth is changed to input state, the PC3 mouth is changed to A/D (mould/number) input state, and when touch-screen was touched by external object, the X+ of touch-screen can pass the PC3 port that a corresponding aanalogvoltage is given microprocessor U5.Microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC3 port then, draws the X coordinate position after calculation process.
Output is made up of row, column sweep circuit, driving circuit and LED display circuit:
The one, column scan drives triode by 74HC154 (4 lines-16 line code translator) and driving circuit Q1 to Q32, resistance R 65--R125, and R92--R111, R82--R85 and LED display circuit are formed.The course of work is as follows:
Microprocessor U5 gives address gating signal of 74HC154, allows 74HC154 gating one tunnel, and to drive the LED of respective column luminous by driving triode then.As: as the IO of microprocessor U5 mouth PD0, PD1, PD2, when PD3 all is high level, four road signals are passed to the address strobe inlet of 74HC154 through R82, R83, R84, R85.When 74HC154 received the address strobe binary signal (1111) of microprocessor U5, it was that low level is effective that 74HC154 is strobed into the 17th pin with address signal, and remaining the 1st to the 11st pin, the 13rd to the 16th pin are that high level is invalid.Low level process R111 is pulled to low level with the base stage of Q31 triode, makes the collector cut-off of Q31, and electric current is added to the Q32 transistor base by R124, R125, makes C, the conducting of the E utmost point of Q32 triode.Make the LED anode of respective column add the 5V power supply.
The one, line scanning is formed (working method of microprocessor U1, U2, U3, U4 is the same, is example explanation circuit theory with U1, is called the line-scan circuit principle) by microprocessor U1, U2, U3, U4 and R1 here to R64, and the course of work is as follows:
The anode of supposing corresponding certain row LED has all added the 5V power supply, the plus earth that it is corresponding, and there then have electric current to flow through LED to be luminous, and R1 is the current-limiting resistance of LED to R16.The LED of respective column went out entirely when the I/O mouth PB0 of U1 was high level to PB7, PD0 to PD7 as can be known by circuit, and respective column LED is bright full during for low level.(this moment, the touch-screen touched point was a low level) sent I/O mouth PC0, PC1, PC2, the PC3 of U1 to after microprocessor U5 collected touch screen signal by I/O mouth PD4, PD5, PD6, the PD7 of U5, U1 composes the data message received to the I/O mouth PB0 of U1 to PB7 port and PD0 to the PD7 port by the certain calculation logic then, the level of corresponding port changes and (has only two kinds of high-low levels here, height is VCC, and low is 0V).
Power unit is by shown in the annex 1, and VR1 is 7805 (three-terminal voltage-stabilizing 5V), and C6 is the filter capacitor of power input, and C5 is a high-pass filtering electric capacity, and C7 is the filter capacitor of input end, and C8, C9, C10, C12, C13, C14 are the high-pass filtering electric capacity of 5V output.
C1, C2, C3, C4, C11 be U1, U2, U3, U4, U5 must the distribution road.
The present invention with the education informations content by the input button or/and the touch-screen input media be input in the microprocessor, show that by the LED that scan drive circuit connected output unit shows relevant education informations content again, can preserve and access at any time the data of being preserved to former person's handwriting at any time, can revise person's handwriting arbitrarily, need not support equipments such as projector and computer, adopt the LED lamp and the multi-colored led lamp of different colours to show simultaneously, have simple in structure, economic environmental protection, long service life and advantage easy and safe to operate are the device for image in places such as a kind of suitable office meeting and school instruction.
Claims (5)
1. electronic instruction plate is characterized in that: a microprocessor that is connected with power supply and storer is arranged, and microprocessor is connected with the importation, and the scan drive circuit of this microprocessor and output links, and scan drive circuit is connected with LED and shows output unit.
2. electronic instruction plate as claimed in claim 1 is characterized in that: described importation is for importing button or/and the touch-screen input media.
3. electronic instruction plate as claimed in claim 1 or 2 is characterized in that: described importation is finished by the four-wire ohm touch-screen;
The one, the X coordinate obtains: earlier with the software design signal IO mouth PC1 (X-) of microprocessor U5 is put 0 (low level), PC3 (X+) puts 1 (high level); Make the two ends (X-, X+ port) of touch-screen add 5V voltage, the PC0 mouth is changed to input state, the PC2 mouth is changed to A/D (mould/number) input state, when touch-screen is touched by external object, the Y+ of touch-screen can pass the PC2 port that a corresponding aanalogvoltage is given microprocessor U5, microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC2 port then, draws the Y coordinate position after calculation process;
The 2nd, the Y coordinate obtains: earlier with the software design signal IO mouth PC0 (Y-) of microprocessor U5 is put 0 (low level), PC2 (Y+) puts 1 (high level), make the two ends (Y-, Y+ port) of touch-screen add 5V voltage, the PC1 mouth is changed to input state, the PC3 mouth is changed to A/D (mould/number) input state, when touch-screen is touched by external object, the X+ of touch-screen can pass the PC3 port that a corresponding aanalogvoltage is given microprocessor U5, microprocessor U5 can be converted to numerical information with the aanalogvoltage of PC3 port then, draws the X coordinate position after calculation process.
4. electronic instruction plate as claimed in claim 1 is characterized in that: described output is made up of row, column sweep circuit, driving circuit and LED display circuit:
The one, column scan has 74HC154 (4 lines-16 line code translator), driving circuit Q1 to drive triode, resistance R 65--R125, R92--R111, R82--R85 and LED display circuit to Q32, and the course of work is as follows:
Microprocessor U5 gives address gating signal of 74HC154, allows 74HC154 gating one tunnel, and to drive the LED of respective column luminous by driving triode then; As the IO of microprocessor U5 mouth PD0, PD1, PD2, when PD3 all is high level, four road signals are passed to the address strobe inlet of 74HC154 through R82, R83, R84, R85; When 74HC154 received the address strobe binary signal (1111) of microprocessor U5, it was that low level is effective that 74HC154 is strobed into the 17th pin with address signal, and remaining the 1st to the 11st pin, the 13rd to the 16th pin are that high level is invalid; Low level process R111 is pulled to low level with the base stage of Q31 triode, makes the collector cut-off of Q31, and electric current is added to the Q32 transistor base by R124, R125, makes C, the conducting of the E utmost point of Q32 triode; Make the LED anode of respective column add the 5V power supply;
The 2nd, line scanning is made up of to R64 microprocessor U1, U2, U3, U4 and R1, and the line-scan circuit course of work of U1 is as follows:
When the anode of corresponding certain row LED has all added the 5V power supply, the plus earth that it is corresponding, there then have electric current to flow through LED to be luminous, and R1 is the current-limiting resistance of LED to R16; The LED of respective column went out entirely when the I/O mouth PB0 of U1 was high level to PB7, PD0 to PD7 as can be known by circuit, and respective column LED is bright full during for low level; After microprocessor U5 collects touch screen signal, this moment, the touch-screen touched point was a low level, send I/O mouth PC0, PC1, PC2, the PC3 of U1 to by I/O mouth PD4, PD5, PD6, the PD7 of U5, U1 composes the data message received to the I/O mouth PB0 of U1 to PB7 port and PD0 to the PD7 port by the certain calculation logic then, the level of corresponding port changes, here have only two kinds of high-low levels, height is VCC, and low is 0V.
5. electronic instruction plate as claimed in claim 1, it is characterized in that: the VR1 of described power supply is 7805, and C6 is the filter capacitor of power input, and C5 is a high-pass filtering electric capacity, C7 is the filter capacitor of input end, and C8, C9, C10, C12, C13, C14 are the high-pass filtering electric capacity of 5V output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110066968 CN102129790A (en) | 2011-03-18 | 2011-03-18 | Electronic teaching board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110066968 CN102129790A (en) | 2011-03-18 | 2011-03-18 | Electronic teaching board |
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|---|---|
| CN102129790A true CN102129790A (en) | 2011-07-20 |
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| CN 201110066968 Pending CN102129790A (en) | 2011-03-18 | 2011-03-18 | Electronic teaching board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105511090A (en) * | 2016-01-29 | 2016-04-20 | 南京波长光电科技股份有限公司 | Remotely-controlled laser beam expanding lens equipment and remote driving method thereof |
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| CN2906789Y (en) * | 2006-03-10 | 2007-05-30 | 周文胜 | Electronic copying device |
| US20100248203A1 (en) * | 2009-03-26 | 2010-09-30 | Kuo Hsiing Cho | Portable LED interactive learning device |
| CN201749580U (en) * | 2010-08-27 | 2011-02-16 | 史建华 | Demonstrating apparatus of LED (light emitting diode) display screen |
| CN201993918U (en) * | 2011-03-18 | 2011-09-28 | 张哲� | Electronic teaching board |
-
2011
- 2011-03-18 CN CN 201110066968 patent/CN102129790A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2906789Y (en) * | 2006-03-10 | 2007-05-30 | 周文胜 | Electronic copying device |
| US20100248203A1 (en) * | 2009-03-26 | 2010-09-30 | Kuo Hsiing Cho | Portable LED interactive learning device |
| CN201749580U (en) * | 2010-08-27 | 2011-02-16 | 史建华 | Demonstrating apparatus of LED (light emitting diode) display screen |
| CN201993918U (en) * | 2011-03-18 | 2011-09-28 | 张哲� | Electronic teaching board |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105511090A (en) * | 2016-01-29 | 2016-04-20 | 南京波长光电科技股份有限公司 | Remotely-controlled laser beam expanding lens equipment and remote driving method thereof |
| CN105511090B (en) * | 2016-01-29 | 2018-10-26 | 南京波长光电科技股份有限公司 | A kind of the laser beam expanding mirror device and its remote boot server method of remote control |
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Application publication date: 20110720 |