Scientific Superviser: Prof. Dr. Eng. Aurel GONTEAN Author: Horia Octavian SABU

“POLITEHNICA” UNIVERSITY OF TIMIŞOARAELECTRONICS AND TELECOMUNICATIONS

FACULTY DEPARTMENT OF APPLIED ELECTRONICS

Timişoara2010

DC Motors

H-Bridge

FPGA Board

Bluetooth Module

LabVIEW programs

VHDL code

Conclusions2/13Horia Octavian SABU

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This is how a DC motor looks on the inside:

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S1 S2 S3 S4 Result

1 0 0 1 Motor moves right

0 1 1 0 Motor moves left

0 0 0 0 Motor free runs

0 1 0 1 Motor brakes

1 0 1 0 Motor brakes

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The PCB Layout:

The board in action:

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This is where all the magic happens:

6V input from the battery pack

Bluetooth and H-bridge

connections

Duty cycledisplay

PWM adjustmentusing buttons

Switches control direction, PWM generation andmanual override

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Class 1 Bluetooth Radio ModemTransmission distance: 100mLow power consumption: 25mA avgFrequency: 2.4~2.524 GHz

Operating Voltage: 3.3V-6VSerial communications: 2400-115200bpsBuilt-in antennaSmall dimensions: 51.5x15.8x5.6mm

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W, A, S, D keysor arrow keysare used to

control direction

Slider modifiesthe duty cycle

What keys arebeing pressed

ASCII code sentvia bluetooth

Binary representationof the code being sent

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Bluetoothconnection

Keyboardinput

PWMgeneration

Forward,back, leftand right assesment

Conversionto ASCIIcodes

Sending thecommands

via bluetooth

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PWM generation

Direcion controls

The very user-friendlyinterface:

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LabVIEW provides a great environment to control the rover, either on the PC or on the smartphone

The Nexys2 FPGA board permits further improvement of the design without the need to replace existing hardware

A very challenging and complex project (but at the same time – fun!)

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