CN111388291A - A smart blind stick that communicates wirelessly with traffic lights - Google Patents

Abstract

The invention belongs to the technical field of guidance assistance, and relates to an intelligent blind stick for wireless communication with traffic lights; including a signal light device and a blind stick receiving device; the signal light device mainly consists of a wireless communication module A, a single-chip microcomputer A, a display screen, signal light parameters and road width It is composed of setting modules; the blind stick receiving device is mainly composed of wireless communication module B, voice module, single-chip B, speed measurement module and power supply module B; wireless communication module A, display screen, signal light parameter and road width setting module are connected with the port of single-chip A. ;The port connection of wireless communication module B, voice module, speed measurement module and single-chip microcomputer B; wireless communication module A sends the current road width and traffic light information in real time, and wireless communication module B receives the real-time information sent by wireless communication module A and converts it into electrical signal transmission to MCU B. The invention has low cost, is easy to carry, has no complicated requirements for use, and is easy to popularize and use; the invention can help blind people to cross the road safely.

Description

A smart blind stick that communicates wirelessly with traffic lights

technical field

The invention belongs to the technical field of guidance assistance, and relates to an intelligent blind stick for wireless communication with traffic lights.

Background technique

Data from the China Disabled Persons' Federation shows that there are at least 17.31 million blind people in China, accounting for 18% of the world's total. , Travel safety has always been the biggest problem that plagues blind people going out.

At present, there is an auxiliary system that helps blind people to cross the road. First, it locates the real-time position of the blind person through a wristband with a built-in GPS positioning system. When the user reaches the vicinity of the intersection, it prompts the blind person to stop moving, and then uses a small aircraft to collect images. It is sent to the ARM processor for analysis through Bluetooth, and different prompts are issued according to different situations to help the blind pass the road safely. Source: Hou Yaofeng, Chen Xiaoying, Yu Hui. Research on the assistance system for blind people crossing the road based on quadrocopter [J]. Science and Technology Communication, 2016, 8(15): 111-112.

There is also a blind guide robot, which has a variety of sensors, transmits the collected environmental information to the processing center, and feeds back the decision-making information to the execution device through the judgment of the intelligent center. Voice prompts and other methods help the blind to understand the information around the road, judge and choose the path, and the visually impaired can set the destination through the mobile APP, connect the wireless module with built-in GPS to plan the basic route, and complete the function of guiding the blind. The hardware composition of the blind guide robot is usually divided into three modules: sensor, controller and actuator. It can realize navigation in complex environments and is more intelligent. Source: Zhang Jianyi, Chen Xin, Zhang Wanqi. Research and Design of User Experience of Blind Guide Robot [J]. Design, 2018(23)

There is a certain delay when the aircraft is released to collect information. At the same time, it is difficult for the blind to release the aircraft. The aircraft is not only difficult to carry, but also cannot be navigated, and its functions are greatly limited.

Although the blind guide robot has a high degree of intelligence, it is slightly more difficult for the blind to set the destination by operating the APP on the mobile phone. Moreover, its hardware and development costs are very high. Compared with other blind guide devices, it is usually bulky and needs to be lifted manually when going up and down the steps. It cannot be easily crossed over obstacles such as crossing, it is inconvenient to carry, and the range of action is limited.

At the same time, after the status of the signal light is detected through image recognition, when the remaining time for the green light is small, the blind person cannot be reminded whether it is safe to pass the intersection at the current speed. Moreover, when large obstacles or high-speed objects are blocked, image recognition technology cannot make accurate judgments, so it cannot achieve good results at intersections with large traffic flow or complex traffic organization.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the problem existing in the prior art that the blind cannot safely cross the street when the remaining green light time is short, and to provide an intelligent blind stick that wirelessly communicates with the traffic light.

This project mainly conducts research on the barrier-free crossing of the street for the blind. On the basis of the traditional blind stick, the single-chip microcomputer is used as the control core, and the wireless communication module, the voice module, the Bluetooth module, the vibration motor module, the speed measurement module, the switch button, etc. are added. Through the interconnection of traffic lights and blind sticks, it can intelligently prompt blind people whether they can safely cross the street, so as to meet the needs of assisting blind people to cross the street safely.

In order to solve the above-mentioned technical problems, the present invention is realized by adopting the following technical solutions, which are described as follows in conjunction with the accompanying drawings:

An intelligent blind stick for wireless communication with traffic lights, characterized in that it comprises two parts: a signal light device and a blind stick receiving device;

The signal light device is mainly composed of a wireless communication module A1, a single-chip microcomputer A2, a display screen 3, a signal light parameter and a road width setting module 4;

The blind stick receiving device is mainly composed of a wireless communication module B7, a voice module 8, a single-chip microcomputer B11, a speed measurement module 6 and a power supply module B12;

The wireless communication module A1, the display screen 3, the signal light parameter and the road width setting module 4 are connected to the port of the single-chip microcomputer A2;

The ports of the wireless communication module B7, the voice module 8, the speed measuring module 6 and the single-chip microcomputer B11 are connected;

The wireless communication module A1 sends the current road width and traffic light information in real time, and the wireless communication module B7 receives the real-time information sent by the wireless communication module A1 and converts it into an electrical signal and transmits it to the single-chip microcomputer B11.

The blind stick receiving device further includes a vibration motor module 9, which is connected to the port of the single-chip microcomputer B11.

The blind cane receiving device further includes a Bluetooth module 10, one end of the Bluetooth module 10 is connected to the port of the microcontroller B11, and the other end is connected to a Bluetooth headset.

In the technical solution, the wireless communication module B7, the voice module 8, the bluetooth module 10, the single-chip microcomputer B11, the speed measurement module 6 and the vibration motor module 9 are integrated into an integrated circuit board B15, which is installed at the handle of the blind stick.

In the technical solution, a switch button is provided at the handle of the blind stick, and the switch button is connected to the power supply module B12.

In the technical solution, the power supply module B12 includes a power detection unit, and the power detection unit performs power detection on the battery in the power supply module B12, and when the power is lower than the preset power, a low-power warning is performed, and a prompt to charge in time and replace the battery is provided. and USB charging.

In the technical solution, the wireless communication module A1 adopts a one-to-many connection mode. When the blind person arrives at the intersection and prepares to cross the road, he enters the wireless communication signal receiving range, and the blind stick receiving device receives the information from the signal light device.

In the technical solution, the speed measuring module 6 detects the pace through the acceleration sensor, and takes into account the situation of the blind waiting at the intersection, and sets the minimum pace to 0.5m/s, the empirical value of the average pace of the blind.

The signal light device in the technical solution further includes a power supply module A5, the wireless communication module A1, the single-chip microcomputer A2, the display screen 3, the signal light parameter and the road width setting module 4 are integrated on the integrated circuit board A14 and installed on the traffic light pole. Above, below the traffic lights.

Further, the wireless communication module A1, the single-chip microcomputer A2, the display screen 3, the signal light parameter and the road width setting module 4 in the signal light device are integrated into the control board of the traffic light, and are internalized as a part of the traffic light.

Compared with the prior art, the beneficial effects of the present invention are:

Combining various blind guide devices, the present invention is modified on the original basis, has more functions, and helps the blind to travel. First, the present invention is easy to carry and has no complicated requirements for use; second, the blind stick is an indispensable part in the life of the blind, and the present invention is relatively easy to accept; third, the present invention has low cost and is easy to popularize and use; in addition, Most of the existing intelligent blind sticks help the blind to detect and avoid obstacles in the process, but are not perfect in assisting the crossing of the street. The present invention can help the blind to cross the road safely.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is further described:

FIG. 1 is a functional frame diagram of a blind guide robot in the background art

Fig. 2 is a schematic diagram of a blind guide robot in the background art

Figure 3 is a diagram of information transmission and device installation;

Fig. 4 is a schematic diagram of the data processing process of the blind stick receiving device;

Fig. 5 is the working flow chart of the signal light device;

6 is a circuit diagram of a signal lamp device;

Fig. 7 is a signal lamp device diagram;

Fig. 8 is the working flow chart of blind stick receiving device;

9 is a circuit diagram of a blind stick receiving device;

Figure 10 is a diagram of a blind stick receiving device;

11 is a schematic diagram of the connection relationship of the blind stick receiving device;

12 is a schematic diagram of the connection relationship of the signal lamp device;

In the picture:

1. Wireless communication module A; 2. SCM A; 3. Display screen; 4. Signal light parameter and road width setting module; 5. Power supply module A; 6. Speed measurement module; 7. Wireless communication module B; 8. Voice module; 9. Vibration motor module; 10. Bluetooth module; 11. SCM B; 12. Power supply module B; 13. Pin header; 14. Integrated circuit board A; 15. Integrated circuit board B.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail:

In order to realize this function, the present invention includes two devices, which are divided into two parts: a signal light device and a blind stick receiving device.

(1) Signal light device

As shown in Figure 7 and Figure 12, the signal light device is mainly composed of a wireless communication module A1, a single-chip microcomputer A2, a display screen 3, a signal light parameter and road width setting module 4, and a power supply module A5. The inside of the signal light device is controlled by the single-chip computer A2, and the wireless communication module A1, the display screen 3, the signal light parameter and the road width setting module 4 are respectively connected with each port of the single-chip computer A2.

The signal light device takes the single-chip microcomputer A2 as the control core. The wireless communication module A1 is used to communicate with the blind cane receiving device and transmit information. It is programmed into the single-chip computer by writing the corresponding program. Under the control of the single-chip computer A2, according to different road conditions, the signal light parameters and The road width setting module 4 adjusts the green light time and road width of different intersections and inputs them into the device, and displays them on the display screen 3 . A wireless communication module A1, a single-chip microcomputer A2, a display screen 3, a signal light parameter and a road width setting module 4 are integrated on the integrated circuit board A14, and the power supply module A5 provides power support for the device.

As shown in Figure 3, the transmission distance of the wireless communication module A1 selected by the signal light device is about 10 meters, but due to the influence of the external environment such as obstacles, the optimal play distance is 5-6 meters, and the installation height of the general pedestrian crossing traffic light is 2-2.5 meters. m, so the signal light device is installed on the traffic light pole and below the traffic light, which can ensure that the blind person starts to receive the signal within the predetermined range, and avoid the mutual interference of two adjacent signal lights.

In the initial stage of use, in order to realize the function, the signal light device is installed in the above-mentioned position after setting the parameters of green signal ratio and road width. On the control board, it is internalized as a part of the traffic light. After the installation is completed, the device and the traffic light can share the power supply system.

(2) blind stick receiving device

As shown in Figure 10 and Figure 11, the blind stick receiving device is mainly composed of a wireless communication module B7, a speed measurement module 6; a voice module 8, a vibration motor module 9, a Bluetooth module 10, a microcontroller B11, and a power supply module B12. The wireless communication module B7, the speed measurement module 6; the voice module 8, the vibration motor module 9, the Bluetooth module 10, and the single-chip microcomputer B11 are integrated on the integrated circuit board B15, and the power supply module A5 provides power support for the device. As shown in Figure 3, the entire device is installed at the handle of the blind cane.

The blind cane receiving device takes the single-chip microcomputer B11 as the control center, the wireless communication module B7, the voice module 8, the bluetooth module 10, the speed measurement module 6, and the vibration motor module 9 are respectively connected with each port of the single-chip microcomputer B11, and the bluetooth module 10 is connected to the bluetooth earphone, and the voice broadcasts Bluetooth headsets can avoid the problem that blind people cannot hear clearly in noisy environments. In addition, the switch button is connected with the power supply module B12, and the control device starts and stops the power supply and power failure situation through the control device.

The blind cane receiving device realizes data transmission with the signal light device through the wireless communication module B7. The wireless communication module B7 is paired with the wireless communication module A1 to receive the real-time green light remaining time and road width information. At the same time, the speed measuring module 6 collects the current pace of the blind through the acceleration sensor. After the information is processed by the single-chip B11, it is compared whether the current pace can pass the intersection in the remaining green light time, and the result is broadcast to the blind after connecting with the Bluetooth headset through the Bluetooth module 10. The vibration motor module 9 assists the voice module 8 together. Remind the blind that the whole device provides power support under the power supply module B12.

The startup of the device is controlled by the switch button. The switch button protrudes from the handle of the blind stick and is connected to the power supply module B12. When the switch button is pressed, the power supply module B12 is turned on, the power supply starts, and the whole device starts; the power supply module B12 is disconnected and stopped. Power is turned on and the whole unit stops working.

When the blind person walks out of the house and presses the switch button on the blind stick to turn on the blind stick receiving device, the blind stick receiving device is in a state of receiving signals. If it reaches the communication range of the signal light device, the blind stick receiving device starts to work. When the blind person arrives at the intersection and prepares to cross the road, he enters the wireless communication signal receiving range, and the blind cane receiving device receives the information from the signal light device. The signal light device performs wireless communication and inputs the received information into the single-chip B11 for calculation, and intelligently reminds the blind whether it is safe to pass.

The power supply module B includes a power detection unit. The power detection unit detects the power of the battery in the power supply module B. When the power is lower than the preset power, a low-power warning is given and prompts for timely charging. There are two ways of charging: battery and USB.

The information transmission method of the present invention:

As shown in Figure 7, the signal light device sets the green light duration and the current road width through the signal light parameter and road width setting module 4, and displays them on the display screen 3; transmits information through the wireless communication module A1 and the blind cane receiving device. As shown in Figure 5 and Figure 6, the signal light device is mainly used to input the change process of the signal light on and off and output the current information in real time, including the current road width, the remaining time of the green light of the signal light and the total time of the green light.

The wireless communication module A1 of the signal light device sends real-time traffic light information (current green light remaining time and road width at the intersection), and the wireless communication module B7 of the receiving device on the intelligent blind stick receives the information sent by the signal light and converts it into electrical signals and transmits it to the microcontroller B11.

The speed measurement module 6 collects the current pace information through the acceleration sensor, and after data processing by the microcontroller B11, compares whether the current pace can pass the intersection in the remaining time of the green light, and broadcasts the result to the blind person through the Bluetooth module 10 after connecting with the Bluetooth headset .

After the blind cane receiving device works normally, the blind person arrives near the intersection, the receiving device on the blind cane performs wireless communication with the signal light device through the wireless communication module 7, and starts to receive the electromagnetic wave signal from the wireless communication module A1 of the signal light device, that is, the current green light remaining time and Road width.

The wireless communication module selected in the present invention is a one-to-many connection mode, and a one-to-many connection wireless communication module is selected to solve the problem of separate connections when multiple blind people arrive at the intersection at the same time. When multiple blind people are ready to cross the road, multiple blind cane receiving devices establish connections with the signal light device through the wireless communication module to provide individualized reminders respectively.

The data processing process of the present invention:

As shown in Figure 4, the wireless communication module B7 of the blind stick receiving device receives the information from the signal light device, and then inputs it into the single-chip computer B11. If the light is green, the single-chip computer B11 uses the street width and the remaining green light time to calculate to obtain the current green light time. The internally blind person can pass the desired pace and compare it with the current pace collected.

If it can pass, the voice module broadcasts "how many seconds are left in the direction of a certain direction, it is recommended to pass, please pass as soon as possible". If it cannot pass, the voice module will broadcast "how many seconds are left for the green light in a certain direction, it is impossible to pass, please wait for the next green light".

This processing process is carried out under the control of the programmed single-chip microcomputer. As shown in Figure 4, the single-chip microcomputer will continue to process data according to the judgment and selection process. No matter whether it passes or not, under the program setting, it will remind the blind that the green light is about to end.

When the remaining green light time reaches 7s (the remaining green light time includes the actual green light time and the yellow light time, that is, the actual green light time and the yellow light time are considered as valid traffic time in this device), the voice prompt "The current green light time remains 5 seconds. seconds", the time required for voice broadcast is 2 seconds, reminding the blind that the green light is about to end, and when the green light is only 3 seconds left, that is, the yellow light time, the vibration motor module starts to vibrate, indicating the end of the green light for the blind.

The vibration motor module 8 is connected with the single-chip microcomputer, and is integrated on the integrated circuit board B15.

The acceleration sensor is used to detect the pace. Considering the waiting time of the blind, the minimum pace is set to 0.5m/s, the empirical value of the average pace of the blind, to reduce the error.

In addition, when a blind person uses a blind stick, the voice broadcast can be adjusted according to the walking speed through the single-chip B11, and the intelligent voice prompts, that is, when the blind person walks faster, the repeated prompt voice can be ignored. When the walkable announcement coincides with the last remaining 5 seconds, it still prompts the remaining 5 seconds of voice. With the further development of technology, the prompt voice can realize the switching of different languages such as Chinese and English.

Each voice broadcast in the voice module takes 2 seconds. During this period, when the blind person has a fast pace, the collected pace changes continuously, but the broadcast is still processed and broadcasted according to the first blind pace detected by the speed measurement module 6. And during the voice broadcast time, the voice bars of other paces are ignored. In order to complete the above-mentioned functions, the changes of the voice module 8 and the speed measuring module 6 are required under the control of the single-chip B11. Under the limitation of the MCU program written, when the walkable broadcast coincides with the last remaining 5 seconds, the remaining 5 seconds of voice is still broadcast, and the walkable voice bar is ignored.

The invention realizes the real-time information interconnection of the blind stick and the traffic light, and realizes the function of the blind stick to read the traffic light information in real time through the wireless communication module, for example, the traffic light status and the remaining time of the green light, so that the blind person can know the traffic light status at this time and judge Can you cross the street by yourself? In addition, when the light is green, the blind cane receiving device calculates whether the blind person can pass safely within the remaining green light time according to the pace of the blind person, and intelligently reminds the blind person to make it safer for the blind to cross the street.

The present invention realizes personalized information reminder, because considering that the object of use is blind and cannot normally watch the text prompt information, the present invention adds voice prompt and vibration prompt to the device at the same time, and the voice prompt can make the blind person receive the blind information most intuitively. The information sent by the cane can clearly understand the road condition information and traffic lights at this time. After receiving the suggestion of whether it is safe to cross the street, the vibration prompt can be transmitted to the blind through the blind cane. The higher vibration frequency can make the blind more obvious. Receive the traffic light situation at this time, improve their attention, make the crossing safer and the user experience better.

The invention is simple to operate and convenient to use. Considering that it is difficult for the blind to operate complex machines, the invention simplifies the operation of the blind cane, and a switch control button is arranged on the blind cane. When the blind person travels, press the switch button to open the blind cane to receive When the blind person walks near the traffic light, the blind stick receiving device automatically receives the information transmitted by the signal light device, and then prompts the blind person whether they can pass, which is convenient for the blind person to use, and is more conducive to the promotion of the new blind stick.

The invention is easy to carry and has a humanized design. Considering that the blind are a special group, it is relatively inconvenient to carry things. In order to reduce the burden of the blind, the blind cane receiving device of the invention is installed on the existing traditional blind cane. They basically carry a blind stick at all times, and the present invention can assist them to safely cross the street without requiring them to carry other equipment, which is convenient for the blind to use and helps the blind to accept the new blind stick.

The invention is convenient for blind people to travel independently. Blind people, as a special group of people, will be relatively difficult to travel in daily life, and it is difficult to travel alone. Generally, they need to be accompanied by people. The road planning for this special group of blind people is not perfect in traffic planning, and only blind roads are constructed. It cannot meet the needs of the blind, and it is difficult for them to cross the street. The present invention can make it more convenient for the blind to cross the street, so that the blind can travel independently.

Claims (10)

1. An intelligent cane for wireless communication with a traffic light, comprising: comprises a signal lamp device and a blind stick receiving device;

the signal lamp device mainly comprises a wireless communication module A (1), a singlechip A (2), a display screen (3) and a signal lamp parameter and road width setting module (4);

the blind stick receiving device mainly comprises a wireless communication module B (7), a voice module (8), a singlechip B (11), a speed measuring module (6) and a power supply module B (12);

the wireless communication module A (1), the display screen (3), the signal lamp parameter and road width setting module (4) are connected with a port of the singlechip A (2);

the wireless communication module B (7), the voice module (8) and the speed measuring module (6) are connected with ports of the singlechip B (11);

the wireless communication module A (1) sends current road width and traffic light information in real time, and the wireless communication module B (7) receives the real-time information sent by the wireless communication module A (1), converts the real-time information into an electric signal and transmits the electric signal to the singlechip B (11).

2. The intelligent cane of claim 1 in wireless communication with a traffic light, wherein:

the blind stick receiving device further comprises a vibration motor module (9), and the vibration motor module (9) is connected with a port of the single chip microcomputer B (11).

3. The intelligent cane of claim 2 in wireless communication with a traffic light, wherein:

the blind stick receiving device further comprises a Bluetooth module (10), one end of the Bluetooth module (10) is connected with a port of the single chip microcomputer B (11), and the other end of the Bluetooth module is connected with a Bluetooth earphone.

4. The intelligent cane of claim 3 in wireless communication with a traffic light, wherein:

the blind stick is characterized in that the wireless communication module B (7), the voice module (8), the Bluetooth module (10), the single chip microcomputer B (11), the speed measuring module (6) and the vibration motor module (9) are integrated into an integrated circuit board B (15) and are installed at the handle of the blind stick.

5. The intelligent cane of claim 4 in wireless communication with a traffic light, wherein:

and a switch button is arranged at the handle of the blind stick and is connected with a power supply module B (12).

6. The intelligent cane of claim 5 in wireless communication with a traffic light, wherein:

the power supply module B (12) comprises an electric quantity detection unit, the electric quantity detection unit detects the electric quantity of the battery in the power supply module B (12), when the electric quantity is lower than the preset electric quantity, low-electric-quantity early warning is carried out, timely charging is prompted, and two modes of battery replacement and USB charging are provided.

7. The intelligent cane of claim 6 in wireless communication with a traffic light, wherein:

the wireless communication module A (1) adopts a one-to-many connection mode, when the blind person arrives at the intersection to prepare for crossing the road, the blind person enters a wireless communication signal receiving range, and the blind stick receiving device receives information from the signal lamp device.

8. The intelligent cane of claim 7 in wireless communication with a traffic light, wherein:

the speed measuring module (6) detects the pace speed through the acceleration sensor, and the lowest pace speed is set to be 0.5m/s of the experience value of the average pace speed of the blind in consideration of the condition that the blind waits at the intersection.

9. The intelligent cane according to any one of claims 1 to 8 for wirelessly communicating with a traffic light, wherein:

the signal lamp device further comprises a power supply module A (5), and the wireless communication module A (1), the single chip microcomputer A (2), the display screen (3), the signal lamp parameter and road width setting module (4) are integrated on the integrated board circuit board A (14) and are installed on the traffic light pole and below the traffic light.

10. The intelligent cane according to any one of claims 1 to 8 for wirelessly communicating with a traffic light, wherein:

a wireless communication module A (1), a single chip microcomputer A (2), a display screen (3), a signal lamp parameter and road width setting module (4) in the signal lamp device are integrated on a control panel of the traffic lamp, and the signal lamp parameter and road width setting module is internalized to be a part of the traffic lamp.

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