8/10/2019 hobby project for students

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hobby project for studentsMobile controlled trotterAbstract:.......... Land rovers are electromechanical vehicles (Robot) designed to move on land terrain using human instructions. In our project, we intend to control the robot using a mobile phone. Here, we require two mobile phones, one for the userto give the instructions to the robot and other would be mounted on the land rover to receive the instructions, which is in auto receivable mode. Each key pressed on the user mobile phone would be an instruction for the robot to act. Each key pressed will have a unique frequency based on DTMF (dual tone multi frequency) , comprising of two frequencies. This signal received by mobile phone on robot, is decoded by a DTMF decoder and sent to microcontroller (MSP430 series), which is pre-programmed. It is coded in such a way that, the robot is made to perform a particular action for a particular key pressed. There is dc motor driver (H-Bridge) mounted on the robot which drives the motors (2 or 4) for the mechanicalmovement of the rover. This is the central idea of our project. We will also install a camera on the robot for effective monitoring of objects around. Hence, this robot is a Compact Robust surveillance device (CRSD).

Project description:The basic objective of our project is to use a mobile phone to control a

land rover. Here, we use a cell phone to control the robot rather than using RFmodules to control, which has its own demerits like limited working range and f

requency range control. The mobile phone of the user will act as a remote to control the robot movement. The user controller person can sit at a particular place and control the rover as it moves on any land terrain.

The control of the robot mainly contains 3 distinct phases: Reception,processing of signal and action of the robotWorking:The signal perception is done using mobile phone. The processing is done using the on-board microcontroller. The task is performed by the dc motors.

1. Mobile phone (cell phone):

As stated in our project idea, the land rover is controlled by a mobilephone. The user with the help of his mobile phone calls the cell phone which is

mounted on to the land rover. The mounted cell phone is set to auto receivable mode.When the user calls to the cell phone, it receives the call automatically. Eachkey pressed on the user phone acts as the instruction to the robot movement.

2. DTMF decoder:DTMF stands for dual tone multi frequency. Each key press of a mobile phone corresponds to a unique frequency combination which comprises of a high frequencyand a low frequency known as DTMF signal pair. Each signal received is decoded by the DTMF decoder and sent to microcontroller.

3. Microcontroller:

Microcontroller is mounted on the land rover. This microcontroller is pre-programmed. The code is written in such a way that each key press has a unique action. For e.g. , if key 2 is pressed, robot moves forward and if key 5 is pressed ,robot movement is halted. We use MSP430 series microcontroller for our project application. The code would be written in embedded C programming language.Batteries ( 6-9 V) are used as power source.

4. DC motor driver IC:

8/10/2019 hobby project for students

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