CN106556297B

CN106556297B - Can turn into intelligent tape measure of shoes sign indicating number value with measuring length

Info

Publication number: CN106556297B
Application number: CN201510633040.4A
Authority: CN
Inventors: 李向良
Original assignee: Chit Wing Technology Group Co Ltd
Current assignee: Chit Wing Technology Group Co Ltd
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2020-02-14
Anticipated expiration: 2035-09-30
Also published as: CN106556297A

Abstract

The invention discloses an intelligent measuring tape capable of converting the measured length into a shoe code value. And after the measurement is finished, the measurement reading of the length of the foot plate and the converted shoe size value can be kept in the intelligent measuring tape, so that a user can check the shoe size value at any time, and convenience is brought to the user. Meanwhile, the gray codes are directly arranged on the tape tapes and are repeatedly arranged according to the designated period, and each gray code in one period has a black code or a white code with a certain width, so that the gray codes on the tape tapes can be read through the reading device, the traditional scale reading mode is replaced, and the reading stability is enhanced.

Description

Can turn into intelligent tape measure of shoes sign indicating number value with measuring length

Technical Field

The invention relates to the technical field of intelligent measuring tapes, in particular to an intelligent measuring tape capable of converting the measured length into a shoe code value.

Background

The gray code belongs to reliable coding and is a coding mode with minimized errors. Because, although the natural binary code can be converted directly to an analog signal by a digital-to-analog converter, in some cases, for example, every digit of the binary code changes from 3 to 4 decimal digits, a large spike current pulse can be generated by the digital circuit. Gray code does not have this disadvantage, and only one bit changes when it transitions between adjacent bits. It greatly reduces the confusion of logic from one state to the next. Since only one bit is different between two adjacent code groups in the code, in the conversion of linear displacement amount to digital amount for direction, when the linear displacement amount is slightly changed (and the digital amount is possibly changed, the gray code is changed by only one bit, which is more reliable than the case of simultaneously changing two or more bits in other codes, i.e. the possibility of error is reduced.

Gray code disks are mostly adopted for detection or counting in the prior art, and the phenomenon of brush jumping or brush leakage often occurs when the Gray code disks are read by a coder or an electric brush device, namely, the phenomenon of counting error is caused because the electric brush device bounces over a certain Gray code due to the fact that the rotating speed of the electric brush device is too high, and the Gray code is not beneficial to use. Meanwhile, the Gray code disc is arranged in the intelligent tape measure body, and occupies a large internal space, so that the device is large in size.

In the prior art, after the length of the foot plate is measured by the flexible rule, the shoe code value can be obtained only after the length-shoe code conversion table is manually inquired, but the shoe code value cannot be directly obtained, so that inconvenience is brought to a user.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide an intelligent measuring tape capable of converting the measured length into a shoe code value, and aims to overcome the defect that the shoe code value cannot be directly obtained after the length of a sole plate is measured by the flexible measuring tape and a length-shoe code conversion table needs to be manually inquired in the prior art.

The technical scheme of the invention is as follows:

an intelligent tape capable of converting measured length into shoe code values comprises an intelligent tape body and a tape which is arranged in the intelligent tape body and can be drawn out, wherein the front side and the back side of the tape are respectively provided with at least one Gray code channel, and Gray codes in the Gray code channels are repeatedly arranged according to a specified period; the intelligent tape measure body is also internally provided with infrared receiving and transmitting devices which correspond to the Gray code channels one by one and are used for reading Gray codes in the Gray code channels; the intelligent measuring tape is characterized in that a shoe code measuring switching button used for switching a measuring mode of the intelligent measuring tape to a shoe code measuring mode is further arranged on the intelligent measuring tape body, a shoe code conversion calculation circuit used for converting a length value measured by the intelligent measuring tape into a shoe code value is further arranged in the intelligent measuring tape body, and the shoe code measuring switching button is electrically connected with the shoe code conversion calculation circuit.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that a switch device used for controlling the infrared receiving and transmitting device to be turned on or off is further arranged in the intelligent measuring tape body, and the switch device is electrically connected with the infrared receiving and transmitting device.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that the front and the back of the measuring tape are respectively provided with 3 Gray code channels from bottom to top.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that a lower three-position Gray code channel is arranged on the front surface of the measuring tape and is respectively a first position Gray code channel, a second position Gray code channel and a third position Gray code channel.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that 3 infrared receiving and transmitting devices are arranged on one side, opposite to the front side of the measuring tape, in the intelligent measuring tape body, and are respectively a first infrared receiving and transmitting device, a second infrared receiving and transmitting device and a third infrared receiving and transmitting device; the first infrared transceiver is over against the first gray code channel, the second infrared transceiver is over against the second gray code channel, and the third infrared transceiver is over against the third gray code channel.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that a third-position Gray code channel is arranged on the back surface of the tape, namely a fourth Gray code channel, a fifth Gray code channel and a sixth Gray code channel.

The intelligent measuring tape capable of converting the measured length into the shoe code value is characterized in that 3 infrared receiving and transmitting devices are arranged on one side, opposite to the back of the measuring tape, in the intelligent measuring tape body, and are a fourth infrared receiving and transmitting device, a fifth infrared receiving and transmitting device and a sixth infrared receiving and transmitting device respectively; the fourth infrared transceiver is over against the fourth gray code channel, the fifth infrared transceiver is over against the fifth gray code channel, and the sixth infrared transceiver is over against the sixth gray code channel.

Has the advantages that: according to the intelligent measuring tape capable of converting the measured length into the shoe code value, when a user needs to measure the length of the foot plate and convert the length into the shoe code value, the measuring mode of the intelligent measuring tape is switched to the code measuring mode, and the measuring tape can be taken out from the intelligent measuring tape body to finish measurement. And after the measurement is finished, the measurement reading of the length of the foot plate and the converted shoe size value can be kept in the intelligent measuring tape, so that a user can check the shoe size value at any time, and convenience is brought to the user. Meanwhile, the gray codes are directly arranged on the tape tapes and are repeatedly arranged according to the designated period, and each gray code in one period has a black code or a white code with a certain width, so that the gray codes on the tape tapes can be read through the reading device, the traditional scale reading mode is replaced, and the reading stability is enhanced.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the intelligent tape measure of the present invention that converts a measured length into a shoe code value.

FIG. 2 is an exploded view of a preferred embodiment of the smart tape measure of the present invention that converts the measured length into shoe code values.

FIG. 3 is a front view of the tape in the preferred embodiment of the intelligent tape measure of the present invention that converts the measured length to shoe code values.

FIG. 4 is a schematic view of the back of the tape in the preferred embodiment of the intelligent tape measure of the present invention which converts the measured length to shoe code values.

Detailed Description

The invention provides an intelligent measuring tape capable of converting the measured length into a shoe code value, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 2, fig. 1 is a schematic structural diagram of a preferred embodiment of an intelligent tape measure capable of converting a measured length into a shoe code value according to the present invention, fig. 2 is an exploded view of a preferred embodiment of an intelligent tape measure capable of converting a measured length into a shoe code value according to the present invention, the intelligent tape measure capable of converting a measured length into a shoe code value comprises an intelligent tape measure body 100 and a tape 200 that is disposed in the intelligent tape measure body 100 and can be drawn out, at least one gray track is disposed on each of a front surface and a back surface of the tape 200, and gray codes in the gray tracks are repeatedly disposed according to a designated cycle; the intelligent tape measure body 100 is also internally provided with infrared receiving and transmitting devices 300 which correspond to the Gray code channels one by one and are used for reading Gray codes in the Gray code channels; the intelligent measuring tape comprises an intelligent measuring tape body 100 and is characterized in that a shoe size measuring switching button 110 used for switching a measuring mode of the intelligent measuring tape to a shoe size measuring mode is further arranged on the intelligent measuring tape body 100, a shoe size conversion calculation circuit (not marked in the figure) for converting a length value measured by the intelligent measuring tape into a shoe size value is further arranged in the intelligent measuring tape body, and the shoe size measuring switching button 110 is electrically connected with the shoe size conversion calculation circuit.

When a user needs to measure the shoe size value, the user only needs to press the shoe size measuring switching button 110 on the intelligent tape body 100 to switch the measuring mode of the intelligent tape to the shoe size measuring mode. Then, the tape 200 is pulled out of the intelligent tape 100 and is tightly attached to the foot plate to be measured. When the tape 200 stops twitching (i.e., becomes a static state), the infrared transceiver 300 reads the gray code on the tape 200 and converts the gray code into a length value, and then the length value is converted into a shoe code value by the shoe code conversion calculation circuit.

In specific implementation, the shoe size conversion calculation circuit is pre-stored with a length value-Chinese shoe size corresponding table, a length value-American shoe size corresponding table, a length value-European shoe size corresponding table and other length value-shoe size corresponding tables, and the shoe size measurement switching button can be operated to select the length value to be converted into the shoe size standard of each country.

In specific implementation, the intelligent tape body 100 is further provided with a display screen for displaying real-time reading and status of the intelligent tape; the intelligent measuring tape body 100 is also internally provided with a wireless transceiving module for transmitting data of the intelligent measuring tape to the mobile terminal or receiving data transmitted by the mobile terminal; a power supply for supplying power is also arranged in the intelligent tape measure body 100. More specifically, the display screen is an E-ink display screen, a TN display screen, an STN display screen or a TFT display screen; the wireless transceiver module is a Bluetooth module.

Further, as shown in fig. 2, a switch device for controlling the infrared transceiver to turn on or off is further disposed in the intelligent tape measure body 100, and the switch device is electrically connected to the infrared transceiver 300. The switch device comprises a code wheel arranged on the PCB 400 in the intelligent tape measure body 100 and an electric brush 410 contacted with the code wheel. When the tape 200 is pulled, the brush 410 is driven to rotate, when the brush 410 rotates, different contact pieces in the code disc are not contacted continuously, pulses (namely, switch trigger signals) are generated, and at the moment, the infrared transceiver 300 is started to read the gray codes on the tape 200. When the brush 410 stops rotating, the ir transceiver 300 enters a standby power saving state or an off state. Therefore, the infrared reading device is not always started, but is started under the control of the switch device, and the electric energy is effectively saved.

In specific implementation, the infrared transceiver 300 is an infrared transceiver, and the infrared transceiver includes an infrared transmitting module and an infrared receiving module, the infrared transmitting module is connected to the infrared receiving module, and the infrared receiving module is connected to an MCU control chip in the intelligent tape measure.

Further, as shown in fig. 3 and 4, the tape 200 is provided with at least one linear gray track 210 on both sides, and the gray track 210 is provided with a plurality of counting gray codes. In specific implementation, as shown in fig. 1 and fig. 2, a tape outlet 120 is provided on the intelligent tape body 100, and infrared transceiver devices 300 corresponding to the gray tracks 210 one to one are provided at positions close to the tape outlet 120 in the intelligent tape body 100.

Since the tape 200 is increased in width, that is, the tape outlet 120 is increased in height, that is, the thickness of the intelligent tape 100 is increased by disposing all the gray tracks 210 on the same surface of the tape 200, the size of the entire intelligent tape is increased, and the tape is not convenient for a user to carry.

If the gray code tracks 210 are arranged on the two sides of the tape 200, the width of the tape 200 can be reduced, which is beneficial to reducing the volume of the intelligent tape measure and is convenient for users to carry.

For example, when there are 6 Gray tracks 210 on the tape 200, there may be N Gray tracks on the front side (where 1. ltoreq. N.ltoreq.6, and N is a positive integer) and (6-N) Gray tracks on the back side. Since the height of each of the tracks 210 is equal and fixed, and the sum of the heights of the tracks 210 on the same side of the tape 200 is equal to the width of the tape 200, the width of the tape 200 can be minimized when the number of tracks 210 on the front side of the tape 200 differs from the number of tracks 210 on the back side of the tape 200 by 1 or is completely equal.

Preferably, as shown in fig. 3 and 4, the tape 200 has 3 gray tracks 210 on the front and back surfaces thereof from bottom to top; the front surface of the tape 200 is provided with a low three-position Gray code channel, namely a first position Gray code channel 211, a second position Gray code channel 212 and a third position Gray code channel 213; the tape 200 has three high-level tracks, namely a fourth track 214, a fifth track 215 and a sixth track 216.

In specific implementation, as shown in fig. 3, the first gray code channel 211 is provided with a first gray code channel black code and a first gray code channel white code which are sequentially and alternately arranged in black and white, and the maximum width of the first gray code channel black code is 2 mm. As shown in fig. 4, a fourth gray code channel black code and a fourth gray code channel white code which appear in turn in black and white are disposed on the fourth gray code channel 214, and the maximum width of the fourth gray code channel black code is 16 mm. When the maximum width of the black code of the first gray code channel is set to 2mm, each length period in the sixth gray code channel 216 is 64mm (i.e. only one black code and only one white code appear in the same period), that is, the repetition period L of the 6 gray code is set in the tape measure 200_TIs 64 mm. Similarly, when the maximum width of the first-bit gray code channel black code is set to be 4mm, the repetition period L of the 6-bit gray code is set to be 4mm_TIs 128 mm. Since 6 Gray tracks are provided on tape 200, the repeat period L of the 6-bit Gray code is determined_TAt 64mm, the user can draw the tape 200 at various speeds without missing the statistical repetition period L from the infrared transceiver 300_TThe number of times of repeated occurrence is determined, so that the implementation is implemented by the repetition period L of the 6-bit Gray code_TThe thickness is set to 64 mm.

To more clearly illustrate the manner in which the 6-bit gray code is provided on tape 200 of the present invention, it is further illustrated by the 6-bit gray code tables shown in tables 1-4 and FIGS. 3 and 4.

Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number	Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number
								1	000000	0	0	9	001100	1	7
2	000001	0	1	10	001101	1	6
								3	000011	0	2	11	001111	1	5
4	000010	0	3	12	001110	1	4
								5	000110	0	4	13	001010	1	3
6	000111	0	5	14	001011	1	2
								7	000101	0	6	15	001001	1	1
8	000100	0	7	16	001000	1	0

TABLE 1

Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number	Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number
								17	011000	2	0	25	010100	3	7
18	011001	2	1	26	010101	3	6
								19	011011	2	2	27	010111	3	5
20	011010	2	3	28	010110	3	4
								21	011110	2	4	29	010010	3	3
22	011111	2	5	30	010011	3	2
								23	011101	2	6	31	010001	3	1
24	011100	2	7	32	010000	3	0

TABLE 2

Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number	Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number
								33	110000	4	0	41	111100	5	7
34	110001	4	1	42	111101	5	6
								35	110011	4	2	43	111111	5	5
36	110010	4	3	44	111110	5	4
								37	110110	4	4	45	111010	5	3
38	110111	4	5	46	111011	5	2
								39	110101	4	6	47	111001	5	1
40	110100	4	7	48	111000	5	0

TABLE 3

Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number	Serial number	6-bit Gray code	High 3 digit corresponding decimal number	Low 3 digit corresponding decimal number
								49	101000	6	0	57	100100	7	7
50	101001	6	1	58	100101	7	6
								51	101011	6	2	59	100111	7	5
52	101010	6	3	60	100110	7	4
								53	101110	6	4	61	100010	7	3
54	101111	6	5	62	100011	7	2
								55	101101	6	6	63	100001	7	1
56	101100	6	7	64	100000	7	0

TABLE 4

It can be seen from the 6-bit gray code tables in tables 1 to 4 that the repetition period of the 6-bit gray code is 64, and the gray code with the number (M + 1) has only one digit changed (from 1 to 0, or from 0 to 1) compared with the gray code with the number M (where 1 is equal to or less than M is equal to or less than 63). When the black code is 0 and the white code is 1, the 64 6-bit gray codes are printed in order from one end of the tape 200 to the other end. For example, the 6-bit gray code of 000000, which is serial number 1, is set at the end of the starting point, specifically, the highest bit (i.e., the sixth bit) 0 of the 6-bit gray codes is set at the sixth bit gray track 216, the next highest bit (i.e., the fifth bit) 0 is set at the fifth bit gray track 215, the fourth bit 0 is set at the fourth bit gray track 214, the third bit 0 is set at the third bit gray track 213, the next lowest bit (i.e., the second bit) 0 is set at the second bit gray track 212, and the lowest bit (i.e., the first bit) 0 is set at the first bit gray track, where the heights of the 6 codes are equal to the heights of the corresponding gray tracks, the 6 codes are rectangular bars, and the widths of the rectangular bars are all 1mm, so that the gray codes are sequentially set on the tape 200 according to the serial numbers shown in tables 1-4, and the tape 200 shown in fig. 3 and 4 can be obtained. The front surface of the tape 200 shown in fig. 3 is provided with a first gray track 211, a second gray track 212 and a third gray track 213 from top to bottom, and the back surface of the tape 200 shown in fig. 4 is provided with a sixth gray track 216, a fifth gray track 215 and a fourth gray track 214 from top to bottom.

When the front and back of the tape 200 of the intelligent tape measure are provided with 3 gray code channels 210 from bottom to top, the intelligent tape measure is further provided with infrared receiving and transmitting devices 300 corresponding to the gray code channels 210 one to one, and the irradiation range of infrared light emitted by each infrared receiving and transmitting device does not exceed the height range of each gray code channel 210. Specifically, the first infrared transceiver is over against the first gray code channel 211, the second infrared transceiver is over against the second gray code channel, the third infrared transceiver is over against the third gray code channel 213, the fourth infrared transceiver is over against the fourth gray code channel 214, the fifth infrared transceiver is over against the fifth gray code channel 215, and the sixth infrared transceiver is over against the sixth gray code channel 216. The six infrared receiving and transmitting devices are respectively connected with corresponding I/O ports in an MCU control chip in the intelligent tape measure body 100.

Since 3 infrared transceiver devices 300 are respectively disposed on two sides of the tape 200, if the infrared transceiver devices on two sides of the tape 200 are completely opposite to each other, when the infrared rays emitted from the infrared transceiver device 300 on one side of the tape 200 are transmitted through the tape 200, the infrared receiving result of the infrared transceiver device 300 on the other side may be changed, which affects the measurement result.

In order to ensure the accuracy of the measurement result, the start point of the gray track on the front surface of the tape 200 and the start point of the gray track on the back surface of the tape 200 need to be displaced. When the tape 200 is in the initial state without being pulled out, the first infrared transceiver is opposite to the start point of the first gray code channel 211, the second infrared transceiver is opposite to the start point of the second gray code channel 212, the third infrared transceiver is opposite to the start point of the third gray code channel 213, the fourth infrared transceiver is opposite to the start point of the fourth gray code channel 214, the fifth infrared transceiver is opposite to the start point of the fifth gray code channel 215, and the sixth infrared transceiver is opposite to the start point of the sixth gray code channel 216. Because the starting points of the gray tracks on the two sides of the tape 200 are staggered, the positions opposite to the first infrared transceiver, the second infrared transceiver and the third infrared transceiver which are distributed on one side of the tape 200 are staggered by a certain distance relative to the positions opposite to the fourth infrared transceiver, the fifth infrared transceiver and the sixth infrared transceiver which are distributed on the other side of the tape 200. In specific implementation, the offset distance between the starting point of the gray track on the front surface of the tape 200 and the starting point of the gray track on the back surface of the tape 200 is 3-10 mm. Preferably, the displacement distance between the start point of the gray track on the front surface of the tape 200 and the start point of the gray track on the back surface of the tape 200 is 5.5 mm.

Since black codes and white codes appear on each gray code channel 210 in a certain period, and the white codes and the black codes appear alternately. Meanwhile, the black code and the white code have different absorptions for the infrared light emitted by the infrared transceiver 300, specifically, the black code has a high absorptance for the infrared light, the white code has a low absorptance for the infrared light and is lower than the absorptance for the infrared light of the black code, the infrared light reflected back by the black code is received by the infrared transceiver 300 and decoded into 0, and the infrared light reflected back by the white code is received by the infrared transceiver 300 and decoded into 1.

Therefore, when the tape 200 is being pulled, the infrared transceiver 300 and the MCU control chip disposed in the intelligent tape 100 and connected to the infrared transceiver 300 detect the number of times n of the repetition period length and the offset Δ L in the current repetition period length when the tape 200 is being pulled, and then pass L = n L_TThe actual measurement length L can be obtained through calculation by + delta L, so that the length can be accurately measured, and the measurement error is reduced. Particularly, black codes and white codes with certain widths are arranged on each gray code channel of the tape, so that the measurement error caused by deformation of the flexible tape due to stretching is effectively avoided.

In summary, according to the intelligent tape measure capable of converting the measured length into the shoe code value, when a user needs to measure the length of the foot plate and convert the length into the shoe code value, the measuring mode of the intelligent tape measure is switched to the code measuring mode, and the tape measure can be taken out from the intelligent tape measure body to finish measurement. And after the measurement is finished, the measurement reading of the length of the foot plate and the converted shoe size value can be kept in the intelligent measuring tape, so that a user can check the shoe size value at any time, and convenience is brought to the user. Meanwhile, the gray codes are directly arranged on the tape tapes and are repeatedly arranged according to the designated period, and each gray code in one period has a black code or a white code with a certain width, so that the gray codes on the tape tapes can be read through the reading device, the traditional scale reading mode is replaced, and the reading stability is enhanced.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims

1. An intelligent tape capable of converting measured length into shoe code value is characterized by comprising an intelligent tape body and a shoe code valueThe tape measure belt is internally and removably arranged, the front and the back of the tape measure belt are respectively provided with at least one Gray code channel, and Gray codes in the Gray code channels are repeatedly arranged according to a specified period; the intelligent tape measure body is also internally provided with infrared receiving and transmitting devices which correspond to the Gray code channels one by one and are used for reading Gray codes in the Gray code channels; the intelligent measuring tape comprises an intelligent measuring tape body, and is characterized in that a shoe code measuring switching button for switching a measuring mode of the intelligent measuring tape to a shoe code measuring mode is further arranged on the intelligent measuring tape body, a shoe code conversion calculation circuit for converting a length value measured by the intelligent measuring tape into a shoe code value is further arranged in the intelligent measuring tape body, and the shoe code measuring switching button is electrically connected with the shoe code conversion calculation circuit; when the tape measure is in an initial state of not being pulled out, the infrared receiving and transmitting device is over against the starting point of the corresponding Gray code channel; the starting point of the Gray code channel on the front surface of the tape measure belt and the starting point of the Gray code channel on the back surface of the tape measure belt are arranged in a staggered mode; the intelligent tape measure is characterized in that an MCU control chip connected with the infrared receiving and transmitting device is further arranged in the intelligent tape measure body, and the infrared receiving and transmitting device and the MCU control chip jointly detect the length L of the repetition period when the tape measure belt is pulled_TN and the length L of the current repetition period_TThe actual measurement length L is calculated to obtain the actual measurement length L which is n L_T+ΔL。

2. The intelligent tape measure capable of converting the measured length into the shoe code value according to claim 1, wherein a switch device for controlling the infrared transceiver to be turned on or off is further arranged in the intelligent tape measure body, and the switch device is electrically connected with the infrared transceiver.

3. A smart tape measure capable of converting a measured length into a shoe code value according to claim 2, wherein the tape measure is provided with 3 gray tracks on both the front and back of the tape measure from bottom to top.

4. A smart tape measure for converting a measured length to a shoe code value as claimed in claim 3 wherein the front of the tape measure is provided with a lower three-position gray track, a first position gray track, a second position gray track and a third position gray track.

5. The intelligent tape measure capable of converting the measured length into the shoe code value according to claim 4, wherein 3 infrared transceiving devices are arranged on one side, facing the front side of the tape measure belt, in the intelligent tape measure body, and are respectively a first infrared transceiving device, a second infrared transceiving device and a third infrared transceiving device; the first infrared transceiver is over against the first gray code channel, the second infrared transceiver is over against the second gray code channel, and the third infrared transceiver is over against the third gray code channel.

6. An intelligent tape measure capable of converting measured length into shoe code values according to claim 4, wherein the back of the tape measure tape is provided with three high gray tracks, namely a fourth gray track, a fifth gray track and a sixth gray track.

7. The intelligent tape measure capable of converting the measured length into the shoe code value according to claim 6, wherein 3 infrared transceiving devices are arranged on one side, opposite to the back side of the tape measure belt, in the intelligent tape measure body, and are a fourth infrared transceiving device, a fifth infrared transceiving device and a sixth infrared transceiving device respectively; the fourth infrared transceiver is over against the fourth gray code channel, the fifth infrared transceiver is over against the fifth gray code channel, and the sixth infrared transceiver is over against the sixth gray code channel.