In this article we are showing what is IoT (Internet of Things) and how to write your first program in Arduino to blink LED.
int PINNo=5; void setup() { pinMode(PINNo,OUTPUT); } void loop() { digitalWrite(PINNo,HIGH); delay(2000); digitalWrite(PINNo,LOW); delay(2000); }
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5 thoughts on “Basics of IoT and LED blinking program using Arduino Uno board”
Good work
Thanks for appreciation Saman.
#include
#include
#include
#include
#define buzzer 13
int redLED=10; //define the LED pins
int greenLED= 11;
const byte rows = 4; //number of the keypad’s rows and columns
const byte cols = 3;
char keyMap [rows] [cols] = { //define the cymbols on the buttons of the keypad
{‘1’, ‘2’, ‘3’, },
{‘4’, ‘5’, ‘6’, },
{‘7’, ‘8’, ‘9’, },
{‘*’, ‘0’, ‘#’, }
};
byte rowPins [rows] = {1, 2, 3, 4}; //pins of the keypad
byte colPins [cols] = {5, 6, 7, };
Keypad myKeypad = Keypad( makeKeymap(keyMap), rowPins, colPins, rows, cols);
LiquidCrystal lcd (A0, A1, A2, A3, A4, A5);
Servo servo;
String password=”159″;
int position = 0;
int wrong=0;
int total=0;
void setup() {
lcd.begin(16, 2);
pinMode(redLED, OUTPUT); //set the LED as an output
pinMode(greenLED, OUTPUT);
lcd.print(“Door lock System”);
lcd.setCursor(0,2);
lcd.print( “by” );
lcd.setCursor(0,2);
lcd.print(“Engr Hassan”);
delay(2000);
servo.attach(13);
setLocked(true);
delay(1000);
pinMode(buzzer,OUTPUT);
}
void loop() {
char pressed=keypad.getkey();
String key[3];
if(pressed)
{
lcd.clear();
lcd.setCursor(position,2);
lcd.print(pressed);
delay(500);
if(pressed==”*”||pressed==”#”)
{
position=0;
setLocked(true);
lcd.clear();}
else if(pressed==password[position])
{ key[position]=pressed;
position++;
}
else if(pressed!=password[position])
{
wrong++;
position++;
}
if(position==3)
{
if(wrong>0)
{
total++;
wrong=0;
position=0;
lcd.clear();
lcd.print(“wrong”);
lcd.setCursor(5,2);
lcd.print(“password”);
delay(1000);
setLocked(true);
}
else if(position==3 ” wrong==0)
{
position=0
wrong=0;
lcd.clear();
lcd.print(“password”);
lcd.setCursor(5,2);
lcd.print(“accepted”);
delay(1000);
setLocked(false);
}
if(total==3)
{
total=0;
buzzer();
delay(500);
}
}
}
lcd.clear();
lcd.setCursor(16,0);
lcd.print(“Security lock”);
lcd.setCursor(16,1);
lcd.print(“By ENGR HASSAN”);
dealy(2000);
while(1)
{
lcd.scrollDisplayLeft();
delay(200);}
}
void setLocked(int locked)
if(locked)
{
digitalWrite(redLED,HIGH);
digitalWrite(greenLED,LOW);
delay(1000);
servo.attach(13);
servo.write(10);
delay(1000);
servo.detach();
}
else
{
digitalWrite(redLED,LOW);
digitalWrite(greenLED,HIGH);
delay(1000);
servo.attach(13);
servo.write(90);
delay(1000);
servo.detach();}
}
}
void buzzer
{
digitalWrite(buzzer,HIGH);
delay(1000);
digitalWrite(buzzer,LOW);
delay(1000);
}
Please check my code its giving an error
Can you share your error message and also describe what you are trying to do through this code.
How control led in esp8266 Iot