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Virtual Numeric Keyboard for mobile devices using Echo Sound Technique Mr. Harshal Prakash Ahire, Mr. Amid Feroz Patel KJ's, Trinity College of Engineering and Research Pune-48, Maharashtra India
[email protected],
[email protected] ABSTRACT As we all are aware about the scope of virtual world, mobile phones are also trying to get virtual. Many companies are doing the research to make the virtual keyboard and virtually operate able mobile phone In this paper we proposed a new technique in which we are going to create a virtual keyboard for the mobile device, this keyboard is will be virtual and we will able to communicate with phone just typing on the virtual keyboard. This approach of implementing the virtual keyboard is having less implementation cost as compare to other approaches, as well as it is not harmful to the user who is going to use it. We are going to create a virtual keyboard in which we will show the numeric keypad, which will have the numbers 0-9. The user is going to type virtually and that number will be get printed on the mobile phone screen.
Index Terms: Virtual Keyboard, Echo Sound Technique, Formulae and Calculation. I.
INTRODUCTION
In this paper we are going to Design the virtual keyboard for the mobile device which is going to reduce the human efforts to do the operation on mobile device such as typing, etc. In this approach keyboard will be projected on the ground, we will be using the echo sound technique to do the operations hence we are going to make the use of ultrasonic sound sensors. Ultrasonic sensors are used to calculate the distance. We are going to calculate the distance of finger whichever placed on the virtual keyboard. The Sensors are going to calculate the distance of the finger placed. The distance will be store in the database and will get compared with the calculated or defined data. After comparing data generated by sensor with the data present in the database, the defined key is going to type on the mobile device. The Ultrasonic Sensors which we are going to use is having capacity to sense the distance of obstacle in range of 200cms. The sensors will be connected to a microcontroller which will be going to send the data to the mobile phone. II. EXPLANATION A. Virtual Screen We are going to use the projector of the mobile device to create the virtual screen, this virtual screen is important because we are going to type on this screen only, we are going to use the reflectors to make the screen visible to human being in well format. The angle of the reflector is the most important thing, because if there is a little difference in the angle of the reflector the output will get changed. The Virtual screen which is projected on the ground will exactly same as that of the mobile screen. The distance of the each key is different from each other and the key size is of each key is fixed and same for more information [Figure: 2 and 3].
B. Sensors Sensors are the main thing of the project, we are going to take the user data via sensors only, sensors are going to record the data and transfer the data to the microcontroller, the ultrasonic sensors are having capability take or read the data in “Parabolic” manner. It is making a parabola from the sensors in range of around 200cms. The data captured by the sensors will be in the form of centimetres. The data of each key is having one starting point and one ending point as well as the edges of the key are defined in the code only so it is going to capture the data and compare it with the database, and the most suitable output will be displayed on the output screen, for more information [Figure: 2]. C. Microcontroller We are going to use one microcontroller, this microcontroller is going to send the data which is capture by the sensors. This data is sent to the mobile device via Bluetooth. Microcontroller is having the physical connections with the sensors as well as with the Bluetooth module. The physical connection is done with the help of wires. These wires are fixed in breadboard and the hardware device, for more information [Figure: 1]. D. Android App The device will require and android app which can display the required output on the mobile screen. The output will be in the form of keys ranging from “0-9”. The Android app is expected to show the exact key which will be pressed by the human on the virtual keyboard. III. Algorithm to Implement Step 01: START Step 02: Switch the projector on and make the settings of the reflector. Step 03: Turn on the App of the mobile. Step 04: Switch on the sensor. Step 05: Check the Connections of the hardware are fine or not. Step 06: Connect the Bluetooth module to the Mobile device. Step 07: Check all connections of hardware as well as the Bluetooth Connection, IF they are not working properly go to Step no: 2. Step 07: Now whole project is working so we are able to do the operations. Step 08: Now we are able to write on the virtual keyboard, and it will get printed in the mobile device. Step 09: Switch of the App Step 10: Switch of Sensors. Step 11: Switch off Projection Step 12: END IV. FORMULAE AND CALCULATIONS I.
Formula for calculating the distance of the finger from sensor in centimetres is:
Distance = microseconds / 29 / 2; Explanation: microseconds is nothing but the time required by the waves to go from the sensor and again come back to receiver by getting reflected from an obstacle.
It’s divided by 2 because we have to calculate the one-way distance means the time required by the wave to travel till finger. And we have divided by 29 because we have to convert that time in distance.
Fig 1: Mobile Device With all Hardware
Figure 2: Mobile Device with Virtual Keyboard as well as with Hardware
Figure 3: Virtual Numeric Keyboard
V. FUTURE WORK We are planning to do all operations of mobile phone virtually, like calling, watching movies, playing games, and all operations of mobile phone. VI. CONCLUSION From this paper we get how to create the Virtual Keyboard for Mobile Device and this created device is efficient to use in any conditions as well as it is in budget of a common man. VI. REFERENCE [1]
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