By: Khalid Hawari Muath Nijim Thaer shaikh Ibrahim Supervisor: Dr. Jamal Kharousheh Dr. Nasser Hamad 27 December 2010

 Introduction  Applications  Block Diagram  Full Schematic  Hardware Layout and Design Specs  User Interface  Tests  Challenges  Successes  Results  Next Step

Motivation:  Wireless becoming more and more available and widely used.  Wireless control technology is effective in the world.  It is general project so it is can be installed for any devices in many places.

Features:  Wireless Controller for DC Motor  Offset QPSK Wireless Standard  Windows based GUI  12 V DC Motor  Battery powered  Variable speed

Benefits:  Practical  Provides Flexibility  Economical  User-friendly  Can be ran from any PC running Windows

 Robotics  Remote control car  Industrial Uses  Household Uses

Microcontroller:  PIC16F pin.  Programmed in PIC C using PIC C Compiler.  Receives control signal from user software.  Translates desired speed to necessary duty cycle.  1 kHz internal clock used for timers.  Sends duty cycle to H-bridge inputs using onboard PWMs.

H-Bridge:  L298N Dual H-Bridge Driver.  Duty cycle determines speed by controlling how long switches are active.  Motor direction can be controlled.  IN1 and IN2 fed from PWM.  Adjusted voltage is output to motor terminals.

 GUI developed in Visual C-sharp.  It can detect the active port automatically.  User can accelerate, decelerate, start and stop motor.  Motor direction can be chosen.  Speed is output to serial port (RS232) by software.

Functional Tests:  Used HyperTerminal to get initial connection between XBee Modules and another XBee with their implemented receiver and transmitter circuits.  Sent serial input to PIC, tested basic outputs (oscilloscope, serial text echo).  Tested H-Bridge using function generator.

Operation Tests:  For a given duty cycle, the resulting speed was measured.  Using a collection of these points, a linear translation from duty cycle to speed was calculated.  At 10 RPM: Duty cycle = 110  At 120 RPM: Duty cycle = 950  Y = mx + b  Duty = 7.93(speed)

 Replaced Voltage Divider consisting of resistors with Voltage Regulators.  H-Bridge suffer from little maximum current.  ASCII Translation Issues.

 Motor ran in both directions.  RPM range.  Maximum continuous load = 30 W

Motor Operations: No-Load Motor Current vs. Terminal Voltage

Motor Operations Max Load Motor Current vs. Terminal Voltage

Duty Cycle to H-Bridge: PIC To H-Bridge Control 42 RPM PIC To H-Bridge Control 90 RPM

 Designed feedback loop for closed system control.  Designed optical encoder wheel on motor shaft with one notch to read RPM.  Directed signal to PIC, began programming.  Modified the interface program to display the real and active RPM.  Install the system in a practical application as a car control.