PRESENTED BY
K.SIRISHA
R.NAVEENKUMAR
A.RIPUNJAYA
M.KOTESWA RAO
P. VIJAY KUMAR

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ABSTRACT
The main motto of this project is to develop a gesture controlled vehicle/ robot/ wheelchair for paralyzed users. This study describes the motivation and the design considerations of an economical head-operated vehicle. In addition it also focuses on the invention of a head-operated control system that employs tilt sensors placed in the headset to determine head position to function as simple head operated remote.
We used an accelerometer module which is based on cc2500 a Texas instruments based MEMS sensor which works based on the variable capacitance method to determine the three directional axial movement of the control device and gives out the respective axial readings in the form of analog voltage levels. We designed this project so that, it might be useful for the needy handicapped people.
The project is constructed using AT89C52 microcontroller, ADC0809, 16X2 dot matrix LCD display, LC & PLL based RF transceivers etc.
Block diagram explanation:
From the block diagram accelerometer send the information about the tilt of the accelerometer sensor. This information is in the form of analog and the information of the tilt is in the form of x,y,z. the x,y,z axis information is indicate the position of the pointer. The data from the accelerometer is given to the ADC controller. The ADC controller can convert the analog information to the digital information for the micro controller understands. The micro controller can take the information from the ADC controller and spit the data in three forms. The three forms are mention the identical position in third directionally of the pointer. The micro controller can sends the position of the pointer with the basic information from the accelerometer.
The reset logic is used to protect the internal program of the micro controller when the power spikes are present in the line current. And the oscillator is used to generate the clock for the micro controller to run the internal programs and clock of the micro controller.
Circuit diagram:
Circuit diagram explanation:
From the circuit 5v dc and 12 v dc is required to drive the all the components. The mains give the 230v ac so first we step down the 230v ac in to 12v ac by using step down transformer. Then the output is given to the full wave rectifier as given in the circuit diagram. The rectifier is eliminating the negative peek voltage of the input voltage the output of the rectifier is the pulsating dc as shown in the block diagram of the rectifier. The error pulses are eliminating by using capacitor filter. Then the output at the parallel of the capacitor is the 12v dc. But the Micro Controller is work on 5v dc so convert the 12v dc in the 5v dc by using regulator (7805) the output of the regulator is constant irrespective of the input voltage.
The Micro Controller requires the preset logic circuit for protection of the internal program and internal clock when in the power failure. A sudden change in the power may cause data error. These types of the errors will corrupt the internal program. The reset logic circuit contains one capacitor and a resistor. This arrangement is shown in the Micro Controller circuit.
XTAL1 and XTAL2 are the input and output, respectively. An inverting amplifier which is configured an on-chip oscillator, as shown in Figure 1. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 2. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed.
The display will be the construction of 2 rows and 16 columns of matrix pixels. This display was also having the two types of data input modes one is parallel data input and another one is series input data type. In the first type the data will given in the form of parallel from the micro controller it need not to require the parallel to series conversion but in the series input mode the Micro Controller can require the parallel to the series converter to convert the parallel data to the corresponding serial data. This display requires the 5 volts power supply for back light.
The driver circuit generally made by using one transistor and one relay. The driver circuit is mainly operated by the Micro Controller. The Micro controller changes the state of the output pin from the low to high, that of from O level to the 1 level. By using this sequence to control the base of the transistor. The transistor will act as an ON/OFF switch corresponding to the input of the base. If the base current of the transistor will high the transistor is under ON condition else it is in OFF state. These conditions will be used to control the relay as shown.
The accelerometer is sent the information of the x, y, z axis’s. this data is in the form of the analog this data is must be convert in to the digital form. So the output of the accelerometer can gives to the input of the ADC controller. The ADC will convert the analog signal into the digital signal and gives to the micro controller. The micro controller take the information from the ADC controller and compare with the internal data. The micro controller take the resultant value after comparison. The resultant value can given to the transmitter section. The transmitter can use the 555 timer IC to sent the data to the receiver.