Stepper motor has an incredible roles in an automatic industries, so controlling a stepper motor is an important function of automation.

1. STEPPER MOTOR SPEED
CONTROL
USING ARDUINO UNO R3
By: SAUMYA RANJAN BEHURA

2. In this project my aim is to control stepper
motor positional accuracy in precise manner.
With the help of latest and popular
development board like Arduino Uno.
1
INTRODUCTION

3. CONTENTS:
 Brief idea about ARDUINO
 Intro to Stepper Motor
 Theory of operation
 Parts List
 Arduino Sketch
 Driver IC
 Schematic Diagram
 Estimation
 Advantages
 Conclusion
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4. Brief Idea about ARDUINO UNO
Microcontroller ATmega328P
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
PWM Digital I/O Pins 6
Analog Input Pins 6
DC Current per I/O Pin 20 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM 2 KB (ATmega328P)
EEPROM 1 KB (ATmega328P)
Clock Speed 16 MHz
LED_BUILTIN 13
Length 68.6 mm
Width 53.4 mm
Weight 25 g 3

5. Intro to STEPPER MOTOR
 Electromechanical device which converts
electrical pulses into discrete mechanical
movements.
 Shaft of a stepper motor rotates in discrete step
increments when electrical pulses are applied .
 Sequence of the applied pulses is directly related
to the direction of motor shaft’s rotation.
 Speed of rotation is directly related to the
frequency of input pulses applied.
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6. Theory of OPERATION
 PM type stepper motor permanent
magnet is rotor and coils are put on
stator.
 The rotor will move precisely 90
degrees for each pulse of electricity
that the motor receives
 Types: 1.Unipolar
2.Bipolar
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7. Block Diagram
6
User Interface Programmer Driver
Stepper
Motor
Command Pulse Winding Current

8. Parts LIST
 Stepper Motor
 Arduino
 Insulated Copper Wire
 Wire Cutters/Strippers
 Potentiometer
 With all necessary Parts(e.g. Soldering Iron)
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9. Arduino SKETCH
#include <Stepper.h>
const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
int stepCount = 0;
void setup() {
}
void loop() {
int sensorReading = analogRead(A0);
int motorSpeed = map(sensorReading, 0, 1023, 0, 100);
if (motorSpeed > 0) {
myStepper.setSpeed(motorSpeed);
myStepper.step(stepsPerRevolution / 100);
}
}
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10. 10

11. Driver IC
 ULN2803 IC(Darlington Pair)
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12. Schematic Diagram
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13. ESTIMATION (approx. = Rs.1135)
Serial
No.
Name Specification Quntity Price
1
Stepper
Motor
Unipolar,5V 1 400
2 Driver IC ULN2803 1 85
3 Arduino Uno UNO,12V 1 500
4
Potentiomet
er
10k 1 46
5
Voltage
Regulator
7809 1 33
6 Diodes 1N4007 4 21
7 Capacitors 1000uf 2 8
8 Resistors According to req. 10 22
9 Wires -do- 1 20
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14. Advantages
 The rotation angle of the motor is proportional to the input pulse
 Excellent response to starting, stopping/reversing
 The motors response to digital input pulses provides open-loop control
 It is possible to achieve very low speed synchronous rotation
 A wide range of rotational speeds can be realized
 Very reliable since there are no contact brushes in the motor
 Accuracy of 3 – 5% of a step and this error is non cumulative from one step to the
next
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15. Conclusion
 Controlling speed of stepper motor with arduino can be
studied throughout this project.
 These are very popular in our day to day life due to a lot of
advantages and also in digital control circuits, such as
robotics because they are ideally suited for receiving digital
pulses for step control
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16. THANK YOU
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