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
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
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
10.
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
15.
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