Intelligent crutch solution development

At this stage, our country has entered an aging society. According to national regulations, people over 65 years old are defined as elderly. In 2011, the proportion of my country's elderly population reached 13.7%. In 2013, my country's population over 60 years old exceeded 200 million. It is expected that in the next 20 years my country's elderly population will enter a period of rapid growth, and will account for one-third of the country's population by 2050. The aging problem not only brings confusion to every family, but also puts great pressure on society. As the elderly grow older, their memory and vision continue to decline, their legs and feet become less flexible, their reactions gradually become slower, and it becomes inconvenient to travel. In recent years, the situation of elderly people getting lost has become more and more serious. You can often see it on the Internet and Weibo. Find news about missing seniors. According to surveys, at least 30% of people over the age of 65 have fallen.

Based on these issues, this article designs a smart crutch specially designed for the elderly. The basic principles of this design work: (1) Use the GPS positioning function to determine the user's position at any time; (2) The user can adjust the distance of the light to facilitate walking at night; (3) When the user falls, the alarm system turns on the alarm function , so that the user can get timely help, and at the same time send a request for help to the guardian or call the corresponding phone number to provide effective help to the elderly when an accident occurs; (4) Measure the relationship between the crutch and the user through pyroelectric infrared rays distance to remind the user to use crutches in time or to facilitate the user to find.

1. Intelligent crutch hardware design

1.1 System function implementation principle

The multi-functional smart crutch mainly uses microcontroller technology and is a smart shrinking crutch with infrared ranging, alarm, tilt and other functions. The smart crutch hardware is mainly composed of angle sensor, pyroelectric sensor, buzzer, and 89S52 microcontroller control circuit.

1.2 Hardware circuit design

(1) Working principle of the SCA60C angle sensor: This design uses the 89S52 microcontroller as the control core and uses the SCA60C single-axis inclination sensor to measure the balance state of the crutch. When the crutch is in a balanced state, the angle sensor SCA60C is at 0° with the horizontal plane, and the Vout terminal outputs an analog voltage of 0.5V. When the crutch is perpendicular to the ground, the angle sensor SCA60C is 90° to the horizontal plane, and Vout outputs an analog voltage of +5V. The sensor SCA60C can only accurately detect the range of 0~90°. Within this range, the Vout terminal outputs an analog voltage signal of +0.5V~+5V that is proportional to the inclination angle. Therefore, the output terminal Vout of the sensor SCA60C can be measured. The magnitude of the voltage determines the angle between the crutch and the horizontal plane.

(2) Buzzer driving principle: The electromagnetic buzzer is mainly composed of an oscillator, electromagnetic coil, vibrating diaphragm, magnet and shell. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm vibrates periodically to produce sound under the interaction of the electromagnetic coil and the magnet. Since the sound of the buzzer requires a certain current to drive it, the output current of the I/O pin of the microcontroller is small, so the TTL voltage output by the microcontroller basically cannot drive the buzzer, so a triode is added to drive the amplified buzzer.

(3) Working principle of human body pyroelectric infrared sensors: Pyroelectric infrared sensors are all pyroelectric infrared sensors based on the principle of pyroelectric effect. The human body has a constant body temperature of about 37°, so it emits infrared rays of about 10 μm to work. of. The infrared rays of about 10 μm emitted by the human body are enhanced by a Fresnel filter and then concentrated on the infrared induction source. The infrared induction source uses pyroelectric elements. This element will lose its charge balance when it receives changes in the temperature of the infrared radiation from the human body. , releasing charge outward. Once the human body enters the detection area, the infrared radiation of the human body is focused through part of the mirror and received by the pyroelectric element. After being processed by the microcontroller, an alarm is generated.

2. Smart crutch software functions

The smart crutch software part mainly includes: initialization settings, establishing GPS positioning, online monitoring, electronic fence, family number setting, help-seeking and other functions.

(1) Software block diagram design: Guardians can enter the software interface through the web or mobile client. If it is the first time to use it, initialization settings must be performed first. Fill in the relevant content according to your own situation and determine whether the GPS positioning function installed in the crutch is turned on. If it is turned on, you can know the location of the crutch at this time based on the GPS positioning. When the crutch is tilted, the buzzer in the hardware circuit turns on. Send an alarm; when it exceeds 1 minute, the motor automatically dials the preset phone number through the hardware circuit to get further help. You can also set up electronic fences in the interface. When the set range is exceeded, an alarm will be prompted.

(2) Call settings: This setting can set up to 4 numbers. Users can set numbers according to their own needs. The SOS button can set emergency calls.

(3) GPS positioning function: GPS positioning is divided into two parts: online monitoring and electronic fence setting. The online monitoring function can be used for positioning through maps, satellites, and three-dimensional methods.

3. Design of the appearance of smart crutches

(1) The crutch is designed with an aluminum alloy telescopic rod, the height can be adjusted from 65cm-98cm, and the weight is 320g, making it suitable for more people. Usage: Press the button on the aluminum alloy pole with your hand, move the thin aluminum alloy low pole up and down, and buckle the button into the hole corresponding to the thicker aluminum alloy pole to meet the needs of people of different heights. Height adjustment After it is done, lock the lock ring and fix it.

(2) Usage of lighting and flash: Push button switch on the top of the handle Operation mode: switch one level, white LED light for lighting; second level, white LED lighting + red LED light for flash warning; third level, off.

(3) MP3 function usage: Use your finger to lightly press the MP3 control button in the middle of the side of the handle, and MP3 is in working condition. At this time, tap the left and right buttons with your fingers to select music. Use your fingers to lightly press the up and down MP3 volume control buttons to adjust the sound volume and listen to music at a suitable volume.

(4) Charging usage: Insert one charging end into the DC port of the product and the other end into the standard 5V output USB socket to charge the internal rechargeable battery of the product. At this time, the red charging indicator light will be on, and the indicator light will go off after it is fully charged.

(5) Usage of GPS positioning, phone calls, and alarm functions: Turn on the GPS positioning function switch of the crutch to realize the positioning function. Guardians can log in to the GPS positioning platform through the web client and mobile client to view the user's specific location. At the same time, you can dial preset calls through buttons 1, 2, and 3. The guardian can also dial the phone card number built into the crutch and answer the call by connecting the phone. When the crutch falls over, the buzzer will automatically sound an alarm. When the person leaves the crutch, the buzzer will make a beeping sound.

Summarize

This design is based on research on the psychology and physiology of the elderly. This model is designed with diversified functions, novel technology, and strong market relevance. Through testing of the prototype, it mainly achieves the following functions:

(1) GPS positioning function, the guardian can determine the user's specific location at any time. Guardians can monitor the user's activity trajectory through the GPS positioning interface to achieve continuous real-time positioning. (2) The guardian can set up an electronic fence. When it exceeds the set range, the alarm function will be turned on. If necessary, the guardian will be called and a help message will be sent. (3) When the crutches tip over, the buzzer turns on, and if it exceeds 1 minute, a guardian or SOS distress signal will be called to receive timely help. (4) Basic functions such as LED lighting, MP3, telescopic, etc.

The design uses a rubber handle that conforms to the ergonomic curve to provide maximum safety and comfort during use. With the development of society and the improvement of living standards, it is a general trend to care for and improve the quality of life of the elderly. This design is fully functional, light in weight, simple to operate, reliable to use, and low in cost. It can meet the purchasing power and functional needs of ordinary people and has broad application market expectation.

The above are the details of the smart crutch solution introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. for you. If you have development and design needs for smart crutches for the elderly, you can rest assured to leave them to us. We have rich experience in customized development of electronic products and can evaluate the development cycle and IC price as soon as possible, and can also calculate PCBA quotations. We are agents of many domestic and foreign chips: Songhan, Yingguang, Jieli, Ankai, Quanzhi, realtek, including MCU, voice IC, Bluetooth IC and modules, and wifi modules. Our development capabilities cover software and hardware design such as PCB design, microcontroller development, Bluetooth technology development, software customization development, APP customization development, WeChat public account development, etc. It can also undertake the research and development of smart electronic products, home appliance solution design, beauty instrument development, Internet of Things application development, smart home solution design, TWS headset development, Bluetooth headset speaker development, children's toy solution development, and electronic education product development.