CN2607625Y - Mathematical calculator for student - Google Patents
Mathematical calculator for student Download PDFInfo
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- CN2607625Y CN2607625Y CN 03223557 CN03223557U CN2607625Y CN 2607625 Y CN2607625 Y CN 2607625Y CN 03223557 CN03223557 CN 03223557 CN 03223557 U CN03223557 U CN 03223557U CN 2607625 Y CN2607625 Y CN 2607625Y
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- microprocessor
- key
- student
- mathematics
- lcd
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Abstract
The utility model relates to a student-used mathematic calculator consists of a microprocessor (5) and a keyboard connected with the microprocessor (5), a reset circuit (2), a LCD (3) and a bias circuit (4). The microprocessor (5) is operated according to the primary control program (P) and consists of an operational controller (51), a RAM (52) , a ROM (53), an I/O interface (54), a LCD driver (55) and a timer (56). The RAM (52),the ROM(53) and the I/O interface(54) are connected with the operational controller (51) in a bidirectional way.The LCD driver(55) and the timer(56) are connected in a unidirectional way. The utility model covers the total mathematics teaching contents in the current primary schools, especially covers the fractional transformation, the reduction of fraction, the operation of division, the special constant pai and the percentage operation; and also adds the functions of automatically and manually setting the test-paper and enhances the learning interest for the students after school.
Description
Technical field
The utility model relates to a kind of computing electronics, the mathematical computations device that the education of particularly a kind of and primary school mathematics is relevant.
Background technology
As everyone knows, utilize the ordinary electronic counter can accelerate the arithmetic speed and the precision of numeral; Utilize so-called function calculator can carry out the computing of trigonometric function, exponential function, logarithmic function, the mathematics conversion that can also carry out different systems that has and mathematical statistics computing etc.The former is too simple for the pupil, though latter's function is various, be again a kind of waste for the pupil, and some can not realize dividing exactly in the primary school mathematics and the computing of mark abbreviation, and main is that they all can not be flashed intuitively.
Summary of the invention
The technical problems to be solved in the utility model is student's mathematics counter that a kind of suitable student of design uses.
For achieving the above object, student's mathematics counter of the present utility model comprises microprocessor and the keyboard, reset circuit, LCD and the bias circuit that are connected with microprocessor; Described microprocessor is pressed primary control program P work, comprising: arithmetic and control unit with the LCD driver and the timer of the two-way random access memory ram that is connected of this arithmetic and control unit, read only memory ROM, I/O mouth and unidirectional connection.
Described microprocessor, reset circuit and bias circuit are installed in the housing inner chamber, and described keyboard and LCD are fixed on the upper surface of housing, and protecting cover is arranged on it, and housing is connected at limit, left side loose-leaf with protecting cover.
Described keyboard comprises: mark enter key " a ",
Mark and decimal shift key " F D ", mixed number and improper fraction shift key
Mark abbreviation key " Simp ", percentage sign enter key " % ", percentage shift key " → % ", wherein " → % " final result can be expressed as the form of percentage, also comprise constant key " π ", question mark key "? ", logical relation symbolic key "＜", "＞", the key of setting a question " * ", function key " Mode ", divide exactly key " Int ÷ ".
It is the microprocessor of Winbond W536 that described microprocessor adopts model, order that microprocessor is all and calculating, the intermediate operations variable, expression formula storer etc. all leaves among the RAM of microprocessor, and all programs all leave in the program memory ROM of microprocessor.
It is the LCD of TSC1445 that described LCD adopts model, and its pin is connected with the LCD driver output pin of microprocessor.
Described reset circuit links to each other with the reset pin RST of microprocessor; When more renewing battery or during by reset key, the voltage on the reset pin becomes electronegative potential by noble potential.
Compared with prior art, student's mathematics counter of the present utility model, its function contains the full content of present primary school mathematics education, and mark adopts that duplicate rows is directly perceived to be shown and mark input mode intuitively, and adds the percentage conversion, divides function keys such as number conversion, constant π; The more important thing is,, added the automatic problem building function and the function of manually setting a question in order to improve the interest of the extracurricular study of student.
The drawing explanation
Fig. 1 is the functional-block diagram of the utility model student mathematics counter;
Fig. 2 is the internal circuit diagram of described microprocessor;
Fig. 3 is the external circuit figure of the used microprocessor of the utility model;
Fig. 4 is the basic circuit diagram of reset circuit 2 and bias circuit 4;
Fig. 5 is the public line graph of the used LCD of the utility model;
Fig. 6 is described liquid crystal display signal line graph;
Fig. 7 is the workflow diagram of the master routine P of the utility model mathematical computations device;
Fig. 8 is the utility model student mathematics counter surface structure synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in more detail.
As shown in Figure 1, described student's mathematics counter comprises microprocessor 5 and the keyboard 1, reset circuit 2, LCD 3 and the bias circuit 4 that are connected with microprocessor 5; Described microprocessor 5 is pressed primary control program P work (Fig. 7), comprising: arithmetic and control unit 51 with the LCD driver 55 and the timer 56 (Fig. 2) of these arithmetic and control unit 51 two-way random access memory that are connected (RAM) 52, ROM (read-only memory) (ROM) 53, I/O mouth 54 and unidirectional connection.
Fig. 8 is the utility model student mathematics counter surface structure synoptic diagram, and described microprocessor 5, reset circuit 2 and bias circuit 4 are installed in the inner chamber of housing, and keyboard 1 and LCD 3 are fixed on the upper surface of housing.Above described keyboard 1 and the LCD 3 protecting cover is arranged, housing is connected at limit, left side loose-leaf with protecting cover.
The duplicate rows that described LCD 3 is full dot matrix shows, is used for the demonstration directly perceived of mark.
As shown in Figure 8, described keyboard 1 has 43 buttons, comprising: be used for mark input directly perceived mark enter key " a ",
Be used for mark and little number conversion mark and decimal shift key " F D ", be used for the mixed number and the improper fraction shift key of the conversion of mixed number and improper fraction
Be used for mark reduction of a fraction mark abbreviation key " Simp ", be used to import percentage percentage sign enter key " % ", be used for operation result convert that percentage shows to percentage shift key " → % " and will divide exactly the result and divide exactly key " Int ÷ " with what the form of quotient and the remainder showed.
Also comprise in addition with the relevant key " * " of setting a question, "＜", "＞", "? " after entering the function of setting a question, the pattern that can select to set a question is for manually setting a question or automatic problem building, and the exercise question that is gone out can be preserved nearest 50 automatically, conveniently browses and checks.
Also contain the four direction key in addition, the user can edit the expression formula of input easily.
Also contain calculation keys commonly used such as " π ", " (", ") ", " √ ", " ^ ", " (-) ", "+", "-", " * ", " ÷ " simultaneously.
As shown in Figure 3, counter of the present utility model adopts Winbond W536 microprocessor 5 as calculating and the core component of controlling, and it partly is made up of arithmetic and control unit 51, random access memory (RAM) 52, ROM (read-only memory) (ROM) 53, input/output port 54, LCD driver 55 and timer 56 etc.LCD 3, bias circuit 4, reset circuit 2, keyboard 1 all directly link to each other (Fig. 3 and Fig. 4) with W536 microprocessor 5.Microprocessor 5 is handled all order and calculating, and intermediate operations variable, expression formula etc. all are stored in the random access memory (RAM) 52 of microprocessor 5, and all programs all leave in the ROM (read-only memory) (ROM) 53 of microprocessor 5.
The pin of LCD 3 is connected (Fig. 5) with LCD driver 55 output pins of W536 microprocessor 5, the pin type has two kinds of public and signals, the definite point that will show in the intersection of two types of lead-in wires, described liquid crystal display signal line as shown in Figure 6.
The character brightness that shows on bias circuit 4 and the LCD 3 is relevant, can change brightness by the bias value that changes on the bias circuit 4.Because LCD driver 55 is integrated in the microprocessor 5, so bias circuit 4 directly links to each other with microprocessor 5 (seeing Fig. 3 and Fig. 4).
Reset circuit 2 link to each other with the reset pin (RST) of microprocessor 5 (Fig. 3 and Fig. 4).When more renewing battery or user and press reset key, the voltage on the reset pin changes to electronegative potential by noble potential, becomes noble potential again.When this thing happens, microprocessor 5 was reset program pointer and stack pointer, and program brings into operation from original state.
Keyboard circuit connects the I/O mouth 54 of microprocessor 5.The pin of each button all is connected with two lead-in wires.When button was pressed, these two lines were connected.Microprocessor 5 when operate as normal per 20 milliseconds to button inquiry once.When the voltage on leaded becomes electronegative potential by noble potential, illustrated that key presses.Arithmetic and control unit 51 in the microprocessor 5 is handled and computing accordingly according to the function and the implication of button.
Student's mathematics counter of the present utility model contains distinctive function and the mark Presentation Function intuitively of setting a question, and is more suitable for the student and uses.Can automatic problem building under the state of setting a question or manually set a question by user oneself, and can store 50 nearest exercise questions automatically, automatically or manually after setting a question, system begins to resolve exercise question, and provide correct answer prompting, if the user has imported wrong answer, system also can provide prompting, system provides correct answer after three times, and enters next problem purpose answer.Can select the type of setting a question, the difficulty of setting a question.The user can browse.Distinctive mark function can help the pupil to grasp characteristics such as proper fraction, improper fraction, mixed number, reduction of a fraction, mark and decimal conversion easily.The distinctive function of setting a question can study voluntarily under the situation that does not have the head of a family and teacher to instruct.
Critical component such as following table that student's mathematics counter of the present utility model is adopted:
| Sequence number | Title | Model | Supplier |
| 1 | Microprocessor | Winbond?W536 | Shenzhen Hua Bang Microtronics A/ |
| 2 | LCD | TSC1445 | Sharp Electronics Factory is believed in the Shanwei |
Claims (9)
1, a kind of student's mathematics counter comprises: microprocessor (5) and the keyboard (1), reset circuit (2), LCD (3) and the bias circuit (4) that are connected with microprocessor (5); It is characterized in that: described microprocessor (5) is pressed primary control program P work, comprising: arithmetic and control unit (51) with the LCD driver (55) and the timer (56) of the two-way random access memory that is connected of this arithmetic and control unit (51) (RAM) (52), ROM (read-only memory) (ROM) (53), I/O mouth (54) and unidirectional connection.
2, student's mathematics counter according to claim 1, it is characterized in that: described microprocessor (5), reset circuit (2) and bias circuit (4) are installed in the housing inner chamber, described keyboard (1) and LCD (3) are fixed on the upper surface of housing, protecting cover is arranged on it, and housing is connected at limit, left side loose-leaf with protecting cover.
3, student's mathematics counter according to claim 1 and 2, it is characterized in that: described keyboard (1) comprising: mark enter key " a ",
Mark and decimal shift key " F D ", mixed number and improper fraction shift key
Mark abbreviation key " Simp ".
4, student's mathematics counter according to claim 1 and 2, it is characterized in that: described keyboard (1) also comprises: percentage sign enter key " % ", percentage shift key " → % ", wherein " → % " final result can be expressed as the form of percentage, also comprise constant key " π ", question mark key "? "
5, student's mathematics counter according to claim 1 and 2, it is characterized in that: described keyboard (1) also comprises: logical relation symbolic key "＜", "＞", the key of setting a question " * ", function key " Mode ", divide exactly key " Int ÷ ".
6, student's mathematics counter according to claim 1 and 2, it is characterized in that: it is the microprocessor of Winbond W536 that described microprocessor (5) adopts model, order and calculating that microprocessor (5) is all, the intermediate operations variable, expression formula storer etc. all leaves among the RAM of microprocessor, and all programs all leave in the program memory ROM of microprocessor (5).
7, student's mathematics counter according to claim 1 and 2 is characterized in that: it is the LCD of TSC1445 that described LCD (3) adopts model, and its pin is connected with the LCD driver output pin of microprocessor (5).
8, student's mathematics counter according to claim 1 and 2, it is characterized in that: described keyboard (1) contains 43 buttons, connects the I/O mouth of microprocessor (5); The pin of each button all is connected with two lead-in wires; Button is pressed, and these two lead-in wires are connected.
9, student's mathematics counter according to claim 1 and 2 is characterized in that: described reset circuit (2) links to each other with the reset pin RST of microprocessor (5); More renew battery or by reset key, the voltage on the reset pin becomes electronegative potential by noble potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03223557 CN2607625Y (en) | 2003-02-08 | 2003-02-08 | Mathematical calculator for student |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03223557 CN2607625Y (en) | 2003-02-08 | 2003-02-08 | Mathematical calculator for student |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2607625Y true CN2607625Y (en) | 2004-03-24 |
Family
ID=34162872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03223557 Expired - Fee Related CN2607625Y (en) | 2003-02-08 | 2003-02-08 | Mathematical calculator for student |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2607625Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813448A (en) * | 2009-03-05 | 2010-08-25 | 北京燕化正邦设备检修有限公司 | Method for aligning and centering coupler of rotating machinery and special calculator thereof |
| CN101071408B (en) * | 2005-12-22 | 2011-07-20 | 卡西欧计算机株式会社 | Device for calculating fraction and method for displaying fraction |
| CN104035911A (en) * | 2014-06-20 | 2014-09-10 | 米勇龙 | Novel calculator |
| CN108564847A (en) * | 2018-05-02 | 2018-09-21 | 王亮 | Teaching virtual computing device |
-
2003
- 2003-02-08 CN CN 03223557 patent/CN2607625Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071408B (en) * | 2005-12-22 | 2011-07-20 | 卡西欧计算机株式会社 | Device for calculating fraction and method for displaying fraction |
| CN102184156B (en) * | 2005-12-22 | 2013-07-24 | 卡西欧计算机株式会社 | Device for calculating fraction and method for displaying fraction |
| CN101813448A (en) * | 2009-03-05 | 2010-08-25 | 北京燕化正邦设备检修有限公司 | Method for aligning and centering coupler of rotating machinery and special calculator thereof |
| CN104035911A (en) * | 2014-06-20 | 2014-09-10 | 米勇龙 | Novel calculator |
| CN108564847A (en) * | 2018-05-02 | 2018-09-21 | 王亮 | Teaching virtual computing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |