accelerometer based
TRANSCRIPT
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BySandeep KSreesh SJaleela CKrishnasree G K
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ABSTRACT
SIMPLE SYSTEM TO CONTROL WHEEL CHAIR FORPARALYSED PATIENTS USING MOTION SENSOR
USES TRIPLE AXIS ACCELEROMETER MMA7660FC [I2C
O/P] FROM FREESCALE SEMICONDUCTORS TO SENSEMOTION
CONTROL EQUIPMENT FITTED ON PATIENTS HEADOR PALM IS USED TO CONTROL WHEEL CHAIR
BUILT AROUND RISC CONTROLLER PIC16F877A FROMMICROCHIP FAMILY
TWO GEARED DC MOTORS ARE USED FOR MOTIONOF PROTOTYPE MODEL
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BLOCK DIAGRAM
MICROCONT
RLOLLER
MOTIONSENSOR
DRIVER
DCMOTOR1
DCMOTOR
2Serial
Interface
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MOTION SENSOR Triple axis Accelerometer MMA7660FC is used to sense motion
Uses MEMS sensing g-cell technology
It gives I2C output for X, Y& Z axis orientation
It acts as I2C slave while microcontroller works as master Slave address for this sensor is 0x4c
I2C write built in address is 0x98
I2C read built in address is 0x99
6 bit output for each axis
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I2C operation
Two wire communication bus developed by PHILIPS
SDA [serial data out], SCL[Serial clk] used lines
Single Master [here pic mc] initiates it. Series of Clk pulses from master
On Start Master sends address of slave to recognise it.
Here sensor acts as slave and its address is 0x4c
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I2C START/STOP
I2C BIT TRANSFER
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CIRCUIT DIAGRAM
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PROGRAM FLOW CHARTSTART
INITIALISESENSOR
READ X,YORIENTATION
IFORIENTAIONLEFT?
TURNMOTOR
LEFT
A
B
DISPLAY VALUES
ON
HYPERTERMINAL
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A
IfORIENTAT
IONRIGHT?
TURNMOTORRIGHT
IF UP?
IF DOWN
TURN BOTHFORWARD
TURN BOTHBACKWARD
YES
YES
YES
NO
NO
B
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ADVANTAGES
Easy to operate
Suitable for handicapped people
Superior level of sensitivity Better shock resistivity
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IMPROVEMENTS
Sensor can be interfaced wireless using RF or zigbee orsimilar communication modules
Sensor can read tilt and shake detection and havegreater scope of applications
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CONCLUSION