Проект Smart Watch учащегося 5-го класса

Actuality of theme: the object of the work is relevant to anyone who needs quick access to phone notifications when there is no opportunity to use the gadget itself (at the meeting, in public transport, outside and other situations.).

Research problem: after a market research and technical characteristics of devices on the market, came to the conclusion that the devices meet the requirements put forward, it was not found.

The object and purpose of the project - Smart Watch.

Hypothesis: is it possible to manufacture at home Smart Watch conditions not inferior to the functionality of existing analogues.

Project purposes and tasks:

1. Produce innovative in character device satisfying or exceeding the requirements put forward.

2. Implement a medium-term fiscal micro-project scientific and technical focus.

Methods of the research:

• Comparative analysis of the submitted devices on the market.

• A comprehensive comparison of price /characteristics.

1. Theoretical part.

1.1 High technology in our life.

The rapid development of science and technology, especially in the last decade has changed the thinking of modern man: the transition to digital technology and the spread of information technology has made our lives more comfortable.

The advent of mobile phones have made a real revolution. They have changed our approach to work, study, entertainment and other aspects of our lives. High technology has penetrated into all spheres of human life. Our body tomography scans our bodies in hospitals. There are modern computers and devices that provide access to the Internet at schools, and there are various devices for computations and experiments in academia. PC, mobile communications, the Internet, automated production lines - this is not a complete list of computer technologies. Not so long ago to have a personal computer can`t everyone. Now we can`t imagine our life without mobile phone, and computers are in almost every home.

Moreover, in fact that is not the whole list of gadgets that help us in modern life. You can endlessly talk about the opportunities and the role of high technology in the organization and order of our society. But the obvious fact that the development of medicine and business, science and education, transport and other spheres of human activity is impossible without the development of high technologies.

Modern phones are not only allows you to stay connected 24 hours a day, but also to know everything about everything. Thus, it is enough to be connected to the point WI-FI, or the mobile Internet. As our phones have become our personal secretary, which will awaken at the right time, to remind you of birthdays of the friends, important meeting, even work with documents can do on a modern smartphone without leaving your home. Any first heard the word, we can look in the encyclopedia at your fingertips, and it takes less than a minute. Moreover, thanks to modern technology, we can let their children walk as his mobile reveals its location without the excitement and experiences. Even the getting into an unknown location you can easily find the right way, at the same time we must not be an astrologer or a pathfinder. Just enough to have on hand the phone.

Probably, many of us faced with a situation when someone calls your phone, and it is hidden in a bag or in your pocket.

You start frantically looking for it to get. It`s very well if it does not fall out of the hand. If this situation happens outside in a bad weather or in the subway, at a bus stop and if you listen to music and want to change track or the volume, then get modern smartphone is not as convenient as they now compete thinner / more. Faced with such inconveniences, it was an attempt to find a solution to get rid of these inconveniences.

1.2 Specifications of the device:

• Bluetooth Low Energy Communication standard (BLE)

• Work on one battery charge time is about 5 days

• Ability to use with one hand

• Display notifications (calls / SMS)

Smart Watch can display the following types of notifications hours:

• Calls. The clock starts to vibrate and allow to reject the call without touching the phone at all;

• E-mail, you can`t receive notification for all mailboxes, but only for selected;

• WhatsApp (if necessary).

1.3 Looking for a solution:

After a market study of such devices, we faced with the fact that the unique, satisfying all requirements at once, but they weren`t found. There were devices satisfy most of the requirements, but they are on the heavy side by extraneous features that have let to a rapid consumption of energy and the need to charge the device every night. That made us to develop independently similar device for personal use.

We decided to get a device that not only satisfies the set requirements, but also require little financial investment and using common components. The following components were selected for a prototype:

• Controller ARM Cortex-M3 STM32F103C8T6

• BLE module on the chip CC2541

• Battery Controller MCP73831T-2ACI / OT

• 3 axis accelerometer LIS3DH

• The display with the controller ST7735

Most of the components were purchased through the company AliExpress.

1.4. Structural scheme of the device:

 Bresenham's line algorithm was taken as the basis for our device.

Bresenham's line algorithm is an algorithm that determines the points of an n-dimensional raster that should be selected in order to form a close approximation to a straight line between two points. It is commonly used to draw line primitives in a bitmap image (e.g. on a computer screen), as it uses only integer addition, subtraction and bit shifting, all of which are very cheap operations in standard computer architectures. It is an incremental error algorithm. It is one of the earliest algorithms developed in the field of computer graphics. An extension to the original algorithm may be used for drawing circles.

While algorithms such as Wu's algorithm are also frequently used in modern computer graphics because they can support antialiasing, the speed and simplicity of Bresenham's line algorithm means that it is still important. The algorithm is used in hardware such as plotters and in the graphics chips of modern graphics cards. It can also be found in many software graphics libraries. Because the algorithm is very simple, it is often implemented in either the firmware or the graphics hardware of modern graphics cards.

The label "Bresenham" is used today for a family of algorithms extending or modifying Bresenham's original algorithm.

2. Practical part.

2.1 Making process:

As one of the requirements is to minimize costs, it was decided to produce a printed circuit board for the device yourself.

Chemical etching method in ferric chloride solution was selected for the manufacture of a printed circuit board. For this process, it is necessary to form a copper surface protective coating for the conductors. Fotorizistor  method just for this, so it has high accuracy, high repeatability of results. The  fotorizist Ordyl Alpha 350 was selected for our device, which provides accuracy of 35 microns.

I. Materials:

• Film for inkjet photo printers Lamond

• Fotorizist Ordyl Alpha 350

• Soda kaltsenirovannaya Na2CO3

• Caustic soda NaOH

• Foil glass fiber

• Abrasive detergents Pemolyuks

II. Instruments:

• Epson Artisan 730 Photo Printer

• Scissors for paper

• Tray of domestic container products

• Solid carbide drills VK6M (tungsten carbide)

• Mikrodrill Dremel 3000

• Laminator

• UV lamp with a wavelength of 390-405 nm

• Fotoroller or the shaft of the laminator

III. Procedure for the manufacture of printed circuit boards:

• Thoroughly rinse the board with detergent
• Wash off the detergent
• Immerse the circuit board electronic into the tank with water and applied the photoresist o the surface board
• Roll out gently the fotorizist with the roller on the surface of the board
• Skip to the RF board in paper envelope through the laminator
•  Leave to cool and dry board for 4-8 hours
• Print a photo mask on a transparent foil and allow to dry paint
• Set a photomask to the surface of the board
• Perform illumination board through a mask using a UV lamp for 4 min.
• Remove the protective film DF
• Place the circuit board in the 3-5% Na2CO3 solution and shake the bath with the solution will not fully manifest drawing board and does not wash off not Light Damaged fotorizist.

• Clean the circuit board under running water with a temperature of 30-40S

• Place the circuit board in a container with a solution of ferric chloride

• Remove the circuit board   after the complete dissolution of the copper not protected by the FF

• Rinse it under running water fee

• Place the circuit board in the solution of NaOH

• Remove the circuit board after complete removal of residues FR

• Clean the circuit board under running water and dry.

IV. Installation the circuit board:

To install the card, we will need the following tools:

• Soldering Station ESD (Ersa I-Con Nano)

• Thin tweezers

• Installation of pliers (pliers)

• Device "the third hand"

You need the following materials:

• Flux for mounting BGA chips (NC-559)

• Solder containing lead (Asahi 60/40)

• Isopropyl alcohol

2.2 Programming of the device.