CN203455958U

CN203455958U - Decimal point shifting demonstration device

Info

Publication number: CN203455958U
Application number: CN201320618665.XU
Authority: CN
Inventors: 陈爱红; 薛晓红
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-26
Filing date: 2013-09-26
Publication date: 2014-02-26
Anticipated expiration: 2023-09-26

Abstract

The utility model discloses a decimal point shifting demonstration device and belongs to mathematics demonstration teaching tools. The demonstration device comprises a substrate, a single-chip microcomputer module, a stepping motor drive circuit, and multiple seven-segment digital tubes located on the front surface of the substrate. A stepping motor, a fixed pulley, and a haulage rope mounted between the stepping motor and the fixed pulley are arranged below the multiple seven-segment digital tubes. The haulage rope is provided with a decimal point model. The top part of the substrate is also provided with a first button and a second button. The device can help teachers to visually demonstrate the decimal point shifting process and effectively improve the classroom teaching effect.

Description

A kind of radix point shift indicator

Technical field

The utility model relates to a kind of radix point shift indicator, belongs to maths demonstration teaching aid.

Background technology

On mathematics class, teacher need to teach the impact that the displacement of student's radix point produces decimal size.Traditional teaching method is that decimal is write on the blackboard, and the mode of then getting ready by chalk is simulated the process of radix point displacement, yet traditional teaching method effect is unsatisfactory, and student is difficult to the open-and-shut process of seeing radix point displacement clearly.

Utility model content

The utility model, for the problem in background technology, proposes a kind of radix point shift indicator.

The utility model, for overcoming the above problems, adopts following technical scheme:

A radix point shift indicator, several seven segment digital tubes that comprise substrate, one-chip computer module, stepper motor driving circuit and be positioned at substrate front side; The below of described several seven segment digital tubes be provided with stepper motor, fixed pulley and be arranged on stepper motor and fixed pulley between traction rope; Described traction rope is provided with a radix point model; The top of described substrate is also provided with the first button and the second button; Described one-chip computer module is by stepper motor driving circuit control step machine operation; Described several seven segment digital tubes are connected with the output terminal of one-chip computer module respectively; Described the first button is connected with the signal input part of one-chip computer module respectively with the second button.

Further, the quantity of described seven segment digital tubes is 4-8.

Technique effect:

1, the utility model can help teacher to demonstrate out the shifting process of radix point intuitively, has effectively improved the teaching efficiency in classroom.

2, the utlity model has certain interest, can improve student's learning interest.

3, the utility model design is ingenious, simple to operate, is convenient to promote in each school.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is circuit structure block diagram of the present utility model.

Label title in Fig. 1: 1, substrate; 2, seven segment digital tubes; 3, stepper motor; 4, fixed pulley; 5, traction rope; 6, radix point model; 7, the first button; 8, the second button.

Embodiment

Below in conjunction with accompanying drawing, the technical solution of the utility model is done in further detail and is introduced:

Structure of the present utility model as shown in Figure 1, several seven segment digital tubes 2 that comprise substrate 1, one-chip computer module, stepper motor driving circuit and be positioned at substrate 1 front; The below of described several seven segment digital tubes 2 be provided with stepper motor 3, fixed pulley 4 and be arranged on stepper motor 3 and fixed pulley 4 between traction rope 5; Described traction rope 5 is provided with a radix point model 6; The top of described substrate 1 is also provided with the first button 7 and the second button 8.

As shown in Figure 2, described one-chip computer module, by 3 work of stepper motor driving circuit control step motor, can drive radix point model 6 to move left and right by traction rope 5 during stepper motor 3 work to circuit structure of the present utility model; Described several seven segment digital tubes 2 are connected with the output terminal of one-chip computer module respectively; Described the first button 7 is connected with the signal input part of one-chip computer module respectively with the second button 8.

The quantity of described seven segment digital tubes 2 is 4-8, for realizing digital displaying function; The MSP430F5438A microcontroller of the main YouTI of described one-chip computer module company forms, and it has nearly 87 I/O mouths, is enough to meet the nearly demand for control of 8 seven segment digital tubes; The L298N doube bridge driver of the main YouST of described stepper motor driving circuit company forms, for realize stepper motor 3 forward, reverse and stop; Described radix point model 6 can adopt red round plastic sheet, for representing radix point.

During use, teacher can be placed on substrate 1 on dais, and after switching on power, one-chip computer module can be controlled described numeral of several seven segment digital tubes 2 random displays.Teacher can control radix point model 6 by the first button 7 and the second button 8 and move left and right: be a teacher while pressing the first button 7, one-chip computer module meeting control step motor 3 forwards, so that radix point model 6 is moved to the left; Be a teacher while pressing the second button 8, one-chip computer module can reverse by control step motor 3, so that radix point model 6 moves right; Be a teacher while unclamping two buttons, one-chip computer module can stop by control step motor 3, the position needing radix point model 6 is parked in to teacher.

Claims

1. a radix point shift indicator, is characterized in that: comprise substrate (1), one-chip computer module, stepper motor driving circuit and be positioned at positive several seven segment digital tubes (2) of substrate (1); The below of described several seven segment digital tubes (2) be provided with stepper motor (3), fixed pulley (4) and be arranged on stepper motor (3) and fixed pulley (4) between traction rope (5); Described traction rope (5) is provided with a radix point model (6); The top of described substrate (1) is also provided with the first button (7) and the second button (8); Described one-chip computer module is by stepper motor driving circuit control step motor (3) work; Described several seven segment digital tubes (2) are connected with the output terminal of one-chip computer module respectively; Described the first button (7) is connected with the signal input part of one-chip computer module respectively with the second button (8).

2. a kind of radix point shift indicator according to claim 1, is characterized in that: the quantity of described seven segment digital tubes (2) is 4-8.