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this is the simple projec for arduino with RFID and LCD display... here the name of student only displayed in LCD display.... we can sent that to cloud to online attendance using esp8266 or using lab with python....                                  The code is here /* PINOUT: RC522 MODULE    Uno/Nano     MEGA SDA             D10          D9 SCK             D13          D52 MOSI            D11          D51 MISO            D12          D50 IRQ             N/A          N/A GND             GND          GND RST...

                      codings for ultrasonic sensor #define trig 5 #define echo 6 void setup() {   Serial.begin(9600);   pinMode(trig,OUTPUT);   pinMode(echo,INPUT);   pinMode(13,OUTPUT); } void loop() {   long duration , distance;      digitalWrite(trig,LOW);   delay(2);   digitalWrite(trig,HIGH);   delay(2);   digitalWrite(trig,LOW);      duration= pulseIn(echo,HIGH);   distance=(duration/2)/29.1;   if(distance <= 10)   {     digitalWrite(13,HIGH);   }   else   {     digitalWrite(13,LOW);   }     delay(1000);    } ---------------------------***********----------------------------***************------------------ This is the codings for ultrasonic sensor...  For reference watch my  yout...

this is coding part for petrol measuring project.How the codes are working and how is run.All details are told in this video.This is fully tamil video.So you will learn easily.                                 code for this project #define trig 5 #define echo 6 #include <LiquidCrystal.h> LiquidCrystal LCD(8,9,10,11,12,13); //(en ,rs,d0,d1,d2,d3) void setup() {   Serial.begin(9600);   LCD.begin(16,2);   pinMode(trig,OUTPUT);   pinMode(echo,INPUT);   pinMode(13,OUTPUT);   pinMode(4,OUTPUT);   digitalWrite(4,HIGH); } void loop() {   digitalWrite(trig,LOW);   delay(2);   digitalWrite(trig,HIGH);   delay(2);   digitalWrite(trig,LOW);      long t= pulseIn(echo,HIGH);   float cm=t/29/2;   LCD.setCursor(0,0);   LCD.print("petrollevel:");   LCD.setCursor(12...

                                      I ntroduction Hai everyone welcome friends this blog for you.. I upload arduino codings for you . Then you easily copy that and then upload in your arduino... REFERENCE:  youtube channel .. My important project is home automation.. If you have an great ideas about home automation plz comment in comment box... And also comment my drawbacks.. 

This is the codings for home automation program Here we control 4 relays ,water level induction ,thermal and humanity  , motion detection and it is send to could (adafruit io) and it also receive the codings using python program. the arduino program is below....... for reference visit the video.... my automation video (youtube video link)                              arduino program #include <dht.h> #define dht_apin A0 dht DHT; int data; int LED=13; int fan=5; int motor = 9; int light, waterup, waterdown, PIR, thermal,humidity; //output of pir pin2 and light sensor pin6 //waterup output A1 and waterdown A2 //thermal output A0 void setup() {    Serial.begin(9600);                               //initialize serial COM at 9600 baudrate   pinMode(LED, OUTPUT); //totally free pins...