Arduino Workshop Day 2 - Advance Arduino & DIY

WORKSHOP ON ARDUINO
DAY – 2: ADVANCE ARDUINO
DESIGN INNOVATION CENTRE

Activity 9 : DC Motor Speed & Direction Control
Motor:
An electric motor is an electrical machine that converts electrical
energy into mechanical energy. Most electric motors operate through the
interaction between the motor's magnetic field and electric current in a wire
winding to generate force in the form of rotation of a shaft.
DC Motor
The electric motor operated by direct current is called a DC Motor. This is a
device that converts DC electrical energy into a mechanical energy.

DC Motor Driver
What is Motor Driver?
 A motor driver IC is an integrated circuit chip
which is usually used to control motors in
autonomous robots.
 Motor driver ICs act as an interface between
the microprocessor and the motors in a robot.
 The most commonly used motor driver IC’s
are from the L293 series such as L293D,
L293NE, etc.
Why Motor Driver?
 Most microprocessors operate at low voltages
and require a small amount of current to
operate while the motors require a relatively
higher voltages and current .
 Thus current cannot be supplied to the motors
from the microprocessor.
 This is the primary need for the motor
driver IC.

Code & Explanation
/* Code for Dc Motor Speed &
Direction Control */
#define button 8
#define pot 0
#define pwm1 9
#define pwm2 10
boolean motor_dir = 0;
int motor_speed;
void setup() {
pinMode(pot, INPUT);
pinMode(button, INPUT_PULLUP);
pinMode(pwm1, OUTPUT);
pinMode(pwm2, OUTPUT);
Serial.begin(9600);
}
void loop() {
motor_speed = analogRead(pot);
Serial.println(pot);
if(motor_dir)
analogWrite(pwm1,
motor_speed);
else
analogWrite(pwm2,
motor_speed);
if(!digitalRead(button)){
while(!digitalRead(button));
motor_dir = !motor_dir;
if(motor_dir)
digitalWrite(pwm2, 0);
else
digitalWrite(pwm1, 0);
}
}

Activity 10 : Servo Motor
Servo Motor
 A servomotor is a rotary actuator or linear actuator that allows for precise
control of angular or linear position, velocity and acceleration.
 It consists of a suitable motor coupled to a sensor for position feedback.
 It also requires a relatively sophisticated controller, often a dedicated
module designed specifically for use with servomotors.
 Servo motor can be rotated from 0 to 180
degree.
 Servo motors are rated in kg/cm (kilogram per
centimeter) most servo motors are rated at
3kg/cm or 6kg/cm or 12kg/cm.
 This kg/cm tells you how much weight your
servo motor can lift at a particular distance.
For example: A 6kg/cm Servo motor should be
able to lift 6kg if load is suspended 1cm away
from the motors shaft, the greater the distance
the lesser the weight carrying capacity.

Code & Explanation
/* Program to control Servo Motor*/
#include <Servo.h>
Servo myservo; // create servo object to control a servo
int pos = 0; // variable to store the servo position
void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}
void loop() {
for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}

Activity 11 : DHT11 Temperature & Humidity Sensor
Temperature & Humidity
 The degree or intensity of heat present in a substance or object is its
temperature.
 Humidity is the concentration of water vapour present in air.
 The temperature is measured with the
help of a NTC thermistor or negative
temperature coefficient thermistor.
 These thermistors are usually made with
semiconductors, ceramic and polymers.
 The humidity is sensed using a moisture
dependent resistor. It has two electrodes
and in between them there exist a
moisture holding substrate which holds
moisture.
 The conductance and hence resistance
changes with changing humidity.
PCB Size 22.0mm X 20.5mm X 1.6mm
Working Voltage 3.3 or 5V DC
Operating
Voltage
3.3 or 5V DC
Measure Range 20-95%RH；0-50℃
Resolution
8bit（temperature），
8bit（humidity）

Code & Explanation
// Program for DHT11
#include "dht.h"
#define dht_apin A0
// Pin sensor is connected to
dht DHT;
void setup(){
Serial.begin(9600);
delay(500); //Delay to let system boot
Serial.println("DHT11 Humidity &
temperature Sensornn");
delay(1000);
//Wait before accessing Sensor
} //end
void loop(){
//Start of Program
DHT.read11(dht_apin);
Serial.print("Current Humidity = ");
Serial.print(DHT.humidity);
Serial.print("% ");
Serial.print("Temperature = ");
Serial.print(DHT.temperature);
Serial.println("C ");
delay(2000);
//Wait 2 seconds before accessing
sensor again.
//Fastest should be once every two
seconds.
} // end loop()

Activity 12 : Infrared Sensor
Infrared (IR) Communication
 Infrared (IR) is a wireless technology used for device communication over
short ranges. IR transceivers are quite cheap and serve as short-range
communication solution.
 Infrared band of the electromagnet corresponds to 430THz to 300GHz and a
wavelength of 980nm.
IR Sensor Module
 An IR sensor is a device which
detects IR radiation falling on it.
Applications:
Night Vision, Surveillance,
Thermography, Short – range
communication, Astronomy, etc.

Code & Explanation
// Program for IR Sensor to detect the
obstacle and indicate on the serial monitor
int LED = 13; // Use the onboard Uno LED
int obstaclePin = 7; // This is our input pin
int hasObstacle = HIGH;
// High Means No Obstacle
void setup() {
pinMode(LED, OUTPUT);
pinMode(obstaclePin, INPUT);
Serial.begin(9600);
}
void loop() {
hasObstacle = digitalRead(obstaclePin);
//Reads the output of the obstacle sensor
from the 7th PIN of the Digital section of
the arduino
if (hasObstacle == HIGH) {
//High means something is ahead, so
illuminates the 13th Port connected LED
Serial.println("Stop something is
ahead!!");
digitalWrite(LED, HIGH);
//Illuminates the 13th Port LED
}
else{
Serial.println("Path is clear");
digitalWrite(LED, LOW);
}
delay(200);
}

Activity 13 : Ultrasonic Sensor
Ultrasound
 Ultrasound is sound waves with frequencies higher than the upper audible
limit of human hearing.
Ultrasonic Sensor
 The Ultrasonic transmitter transmits an ultrasonic wave, this wave travels
in air and when it gets objected by any material it gets reflected back
toward the sensor this reflected wave is observed by the Ultrasonic
receiver.

Code & Explanation
// Program for Ultrasonic Sensor
const int trigPin = 9;
// defines pins numbers
const int echoPin = 10;
long duration; // defines variables
int distance;
void setup() {
pinMode(trigPin, OUTPUT);
// Sets the trigPin as an Output
pinMode(echoPin, INPUT);
// Sets the echoPin as an Input
Serial.begin(9600);
// Starts the serial communication
}
void loop() {
digitalWrite(trigPin, LOW);
// Clears the trigPin
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
// Sets the trigPin to HIGH for 10 µS
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
// Reads the echoPin, returns the sound
wave travel time in microseconds
distance= duration*0.034/2;
// Calculating the distance
Serial.print("Distance: "); // Prints the
distance on the Serial Monitor
Serial.println(distance);
delay(500);
}

Ultrasonic Distance Calculation

Do It Yourself - Line Follower
Line Follower
 Line follower is an autonomous robot which follows either black line in white
are or white line in black area.
Robot must be able to detect particular line and keep following it.
Concepts of Line Follower
 Concept of working of line follower is related to light.
 When light fall on a white surface it is almost fully reflected and in case of
black surface, light is completely absorbed. This behaviour of light is used
in building a line follower robot.

Block Diagram of Line Follower

Code & Explanation
//Arduino Line Follower
Code
void setup()
{
pinMode(8, INPUT);
pinMode(9, INPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
}
void loop()
{
if(digitalRead(8) &&
digitalRead(9)) // Move
Forward
{
digitalWrite(2, HIGH);
digitalWrite(3, LOW);
}
if(!(digitalRead(8)) &&
digitalRead(9)) // Turn
right
{
}
if(digitalRead(8) &&
!(digitalRead(9))) // turn
left
{
}
if(!(digitalRead(8)) &&
!(digitalRead(9))) // stop
{
}
}

Do It Yourself – Light Follower
Light Follower
A light follower robot is a light-seeking robot that moves toward areas of bright
light.
Light Dependent Resistor
An LDR is a component that has a (variable) resistance that changes with the
light intensity that falls upon it. This allows them to be used in light sensing
circuits.

Code & Explanation
//Light Follower Code
void setup() {
pinMode(A0,INPUT); //Right
Sensor output to arduino input
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
Serial.begin(9600);
}
void loop() {
int sensor=analogRead(A0);
delay(100);
Serial.println(sensor);
if (sensor >= 200){
digitalWrite(2,HIGH);
digitalWrite(3,LOW);
digitalWrite(4,HIGH);
}
else{
}
}

Do It Yourself – Obstacle Avoider
Obstacle Avoider
 This obstacle avoidance robot changes its path left or right depending on the
point of obstacles in its way.
 Here an Ultrasonic sensor is used to sense the obstacles in the path by
calculating the distance between the robot and obstacle. If robot finds any
obstacle it changes the direction and continue moving.
Applications:
 Mobile Robot Navigation
Systems,
 Automatic Vacuum Cleaning,
 Unmanned Aerial Vehicles,
etc.

Code & Explanation
const int trigPin = 9;
const int echoPin = 10;
void setup()
{
pinMode(trigPin,
OUTPUT);
pinMode(echoPin,
INPUT);
pinMode (2, OUTPUT);
Serial.begin(9600);
}
long duration, distance;
void loop()
{
digitalWrite(trigPin,
LOW);
HIGH);
LOW);
duration =
pulseIn(echoPin, HIGH);
distance = duration/58.2;
Serial.print(distance);
Serial.println("CM");
delay(10);
if(distance<20)
{
}
else
{
}
delay(90);
}

Additional Resources
1. https://www.arduino.cc/ - Arduino.cc is the home of Arduino platform. It
has extensive learning materials such as Tutorials, References, code for
using Arduino, Forum where you can post questions on issues/problems
you have in your projects, etc.
2. http://makezine.com/ - Online page of Maker magazine, with lots of
information on innovative technology projects including Arduino.
3. http://www.instructables.com/ - Lots of projects on technology and arts
(including cooking), with step-by-instructions, photographs, and videos
4. http://appinventor.mit.edu/ - It allows the budding computer
programmers to build their own apps that can be run on Android devices. It
used a user-friendly graphical user-interface that allows drag-and-drop
technique to build applications that impacts the world.
5. http://fritzing.org/ - Fritzing is open source computer aided design (CAD)
software for electronic circuit design and printed circuit board (PCB)
fabrication, especially with Arduino prototyping. It is an electronic design
automation (EDA) tool for circuit designers.

Desgin Innovation Centre,
Indian Institute of Information Technology, Design &
Manufacturing, Kancheepuram, Chennai – 600127
E-mail: designinnovationcentre@gmail.com

Arduino Workshop Day 2 - Advance Arduino & DIY

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