Here’s my journey in the Kerala IoT Challenge

About me

Hey! I’m A R Rahman. I’m a second year CSE student from AISAT Kalamassery.

Experiment 1

Hello World LED Blinking

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x2)
• LED
• USB cable to connect the arduino
• Resistor

Circuit Diagram:

Code:

 void setup()
{
  pinMode(8, OUTPUT);
}

void loop()
{
  digitalWrite(8, HIGH);
  delay(1000); // Wait for 1000 millisecond(s)
  digitalWrite(8, LOW);
  delay(1000); // Wait for 1000 millisecond(s)
}

Output:

We have an LED which blinks every second.

Experiment 2

Traffic Light

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x4)
• LED (Red,Yellow,Green)
• USB cable to connect the arduino
• Resistors (3x)

Circuit Diagram:

Code:

int redled =10; // initialize digital pin 8.
int yellowled =7; // initialize digital pin 7.
int greenled =4; // initialize digital pin 4.
void setup()
{
pinMode(redled, OUTPUT);// set the pin with red LED as “output”
pinMode(yellowled, OUTPUT); // set the pin with yellow LED as “output”
pinMode(greenled, OUTPUT); // set the pin with green LED as “output”
}
void loop()
{
digitalWrite(greenled, HIGH);//// turn on green LED
delay(5000);// wait 5 seconds

digitalWrite(greenled, LOW); // turn off green LED
for(int i=0;i<3;i++)// blinks for 3 times
{
delay(500);// wait 0.5 second
digitalWrite(yellowled, HIGH);// turn on yellow LED
delay(500);// wait 0.5 second
digitalWrite(yellowled, LOW);// turn off yellow LED
} 
delay(500);// wait 0.5 second
digitalWrite(redled, HIGH);// turn on red LED
delay(5000);// wait 5 seconds
digitalWrite(redled, LOW);// turn off red LED
}

Output:

We have three LEDs which act as traffic lights namely RED, YELLOW and GREEN which goes in such a way that the green glows for 5 seconds, then the yellow starts blinking followed by which the red light comes up which also stays lit for around 5 seconds, proceeding which the green light starts glowing again which continues a cycle.

Experiment 3

LED Chasing Effect

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x7)
• LED (x6)
• USB cable to connect the arduino
• Resistors (6x)

Circuit Diagram:

Code:

int BASE = 2 ;  // the IO pin for the first LED
int NUM = 6;   // number of LEDs
void setup()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     pinMode(i, OUTPUT);   // set I/O pins as output
   }
}
void loop()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, LOW);    // set I/O pins as “low”, turn off LEDs one by one.
     delay(200);        // delay
   }
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, HIGH);    // set I/O pins as “high”, turn on LEDs one by one
     delay(200);        // delay
   }  
}

Output:

We get a chasing effect of a set of LEDs which could be compared to old billboards which had colourful LEDs with lighting effects.

Experiment 4

Button Controlled LED

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x5)
• LED (x1)
• USB cable to connect the arduino
• Resistors (10k ohm and 220 ohm)
• Button switch

Circuit Diagram:

Code:

void setup()
{
  pinMode(2, INPUT);
  pinMode(12, OUTPUT);
}

void loop()
{
  if (digitalRead(2) == HIGH) {
    digitalWrite(12, HIGH);
  } else {
    digitalWrite(12, LOW);
  }
  delay(10); // Delay a little bit to improve simulation performance
}

Output:

We get an LED which lights up when the button is pressed.

Experiment 5

Buzzer

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x2)
• A Buzzer
• USB cable to connect the arduino

Code:

void setup() 
{ 
  pinMode(8,OUTPUT);
} 
void loop() 
{
digitalWrite(8, HIGH); 
}

Output:

A buzzer starts producing sound

Experiment 6

RGB LED

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x4)
• RGB LED (x1)
• USB cable to connect the arduino
• Resistors

Circuit Diagram:

Code:

void setup()
{
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop()
{
  analogWrite(11, 255);
  analogWrite(10, 0);
  analogWrite(9, 0);
  delay(1000);
  analogWrite(11, 0);
  analogWrite(10, 255);
  analogWrite(9, 0);
  delay(1000);
  analogWrite(11, 0);
  analogWrite(10, 0);
  analogWrite(9, 255);
  delay(1000);
}

Output:

LED starts glowing alternatively with the colors Red, Green and Blue.

Experiment 7

LDR light sensor

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x5)
• RGB LED (x1)
• USB cable to connect the arduino
• Resistors
• LDR

Circuit Diagram:

Code:

void setup()
{
  pinMode(A0, INPUT);
  Serial.begin(9600);

  pinMode(10, OUTPUT);
}

void loop()
{
  Serial.println(analogRead(A0));
  if (analogRead(A0) < 400) {
    digitalWrite(10, HIGH);
  } else {
    digitalWrite(10, LOW);
  }
  delay(10);
}

Output:

LED is off when there is light, when it is in the dark the LED lights up.

Experiment 8

Flame Sensor

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x5)
• Buzzer
• USB cable to connect the arduino
• Resistor
• Flame Sensor

Circuit:

Code:

int flame=0;
int Beep=9;
int val=0;
 void setup() 
{
  pinMode(Beep,OUTPUT);
 pinMode(flame,INPUT);
 Serial.begin(9600);
 } 
void loop() 
{ 
  val=analogRead(flame);
  Serial.println(val);
  if(val>=500)
  {  
   digitalWrite(Beep,HIGH); 
   }else 
   {  
     digitalWrite(Beep,LOW); 
    }
   delay(500); 
}

Output:

When you apply flame/heat to the Flame sensor, the analog value of the input gets increased. When this goes over a certain level, the buzzer starts buzzing.

Experiment 9

Temperature Sensor

ITEMS NEEDED:-

• Arduino UNO
• A Breadboard
• Male to male jumper wires (x3)
• Temperature sensor
• USB cable to connect the arduino
• Serial monitor

Circuit:

Code:

int potPin = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
int val;
int dat;
val=analogRead(0);
dat=(150*val)>>8;
Serial.print("Tep");
Serial.print(dat);
Serial.println("C");
delay(500);
}

Output:

The temperature of the surroundings will be constantly be displayed on the serial monitor. In this case, we use the serial monitor on the arduino application itself.