This document outlines a project to control stepper motor speed using an Arduino Uno R3, detailing its components, theory of operation, and advantages. It includes essential information such as the Arduino specifications, a stepper motor's functionality, an Arduino sketch for implementation, and an estimated cost for the parts required. The conclusion states the popularity and versatility of stepper motors in digital control applications like robotics.

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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