This document describes a wireless Bluetooth controller for controlling the speed of a DC motor. It uses Bluetooth wireless technology to send speed control signals from a user interface to a microcontroller, which then translates the desired speed to a duty cycle to control an H-bridge and drive the motor. The system was able to control the motor bidirectionally between 0-95 RPM and test results showed it could accurately control speed and achieve a maximum continuous load of 15W and torque of 1.33 N-m. Potential applications include robotics, remote control vehicles, and industrial and household uses.

1. Wireless Bluetooth Controller For DC Motor
Presented By
Raghavendra K T
524ee10039
Electrial & electronic engineering
Rajeev Polytechnic
Hassan

2. Contents
Introduction
Objective
Block Diagram
User Interface
Microcontroller
Results
Applications
Bibliography

3. Introduction
Speed control of a motor is essential while we are
using any type of motors.Here we are using wireless
bluetooth technology for the speed control of motor
instead of wired control.It is the newly invented method
for the speed control of motor.
Bluetooth is an wireless network used to
communicate in b/w two devices with short centre
distance approximately 10 meters.In this system we are
using bluetooth as a main role for speed control of motor.

4. Objectives
Wireless Controller for DC Motor
Bluetooth Wireless Standard
Windows based GUI
12 V Permanent Magnet Geared Motor
Battery powered
Variable speed

5. Block Diagram

6. Hardware Layout

7. User Interface
GUI developed in Visual C++
User can accelerate, decelerate, start and stop motor
Motor direction can be chosen
Speed referenced to lower geared side
Maximum speed setpoint of 95 RPM
Displays Load side RPM as well

8. User Interface

9. Microcontroller
PIC16F877 40 pin DIP
Programmed in C using CSS Compiler
Receives speed control signal from user
software
Translates desired speed to necessary duty
cycle
16 kHz internal clock used for timers
Sends duty cycle to H-bridge inputs using
onboard PWMs

11. 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

12. Motor Operations
No-Load Motor Current vs. Terminal Voltage
Motor Voltage vs. Input Motor Current (No Load)
0.5
0.45
0.4
Input Current (A) (A)
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0 2 4 6 8 10 12 14
Applied DC Motor Voltage (12 V)

13. Motor Operations
 Max Load Motor Current vs. Terminal Voltage
Motor Voltage vs. Input Motor Current (With Load)
1.4
1.2
Input Current (A) (A)
1
0.8
0.6
0.4
0.2
0
Recommended Max H-Bridge Current = 1.2 A
0 2 4 6 8 10 12 14
Applied DC Motor Voltage (12 V)

14. Results
Motor ran in both directions
0-95 RPM on lower geared side
0-6222 RPM on load side
Maximum continuous load = 15 W
Maximum continuous torque = 1.33 N-m

16. Advantages
This system is easy to operate
It require only one operator
Speed control will be accurate
Power losses will be less

17. Disadvantages
It require more space
Initial cost is more
It require skilled person to operate
It works only in small centre distance

18. Applications
Robotics
Remote control car
Industrial Uses
Household Uses

19. Conclution
Wireless becoming more and more available and
widely used bluetooth is one of the major player
interested in power and motor control