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  CIRCUIT DIAGRAM : CODE : CLICK HERE

  CODE  :  CLICK HERE CIRCUIT DIAGRAM  :  APP NAME: AMR VOICE                                              CLICK HERE                                 YOUTUBE LINK

CODE :  DOWNLOAD CIRCUIT :

            OPTICAL FINGERPRINT SENSOR Optical fingerprint sensors take low-resolution snapshots of the tip of a finger and create arrays of identifiers that are then used to uniquely identify a given fingerprint.  RED          >  5V BLACK     >  Gnd YELLOW  >  2 WHITE      >  3 install Adafruit fingerprint library  go to manage the library and search fingerprint and click on Adafruit fingerprint library ENROLLING FINGERTIP IMPRESSION : FINGERPRINT LED CONTROLLING : CODE FOR LED : #include <Adafruit_Fingerprint.h> // For UNO and others without hardware serial, we must use software serial... // pin #2 is IN from sensor (YELLOW wire) // pin #3 is OUT from arduino (WHITE wire) // comment these two lines if using hardware serial SoftwareSerial mySerial(11,10); Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); void setup() { Se...

Interfacing RFID with Servo and LED  click here for codes

                         MFRC522 RFID RFID means radio-frequency identification. RFID uses electromagnetic fields to transfer data over short distances, RFID is useful to identify people, to make transactions  you can use the RFID system to open a door. for example, only the person with the right information on his card or tag is allowed to enter. An RFID system uses : tags attached to the object to be identified, we have an electromagnetic card. each tag has its own identification (UID) the  reader, that sends a signal to the tag and read its response Specifications : 1. input voltage is 3.3v 2. Frequency 13.56Mhz Library : RFID Library Here PIN LAYOUT : RES   - D9 SDA   - D10 MOSI - D11 MISO - D12 SCK   - D13 3.3V   - 3.3V GND  - GND CODE :   LED AND SERVO #include "SPI.h" #include "MFRC522.h" // LibrARY #define SS_PIN 10 #define RST_PIN 9 #define SP...

                          16x2 LCD Display The LCD (Liquid Crystal Display) a  16x2 means it can display 16 characters per line and there are 2 such lines, in his LCD each character is displayed in a 5x7 pixel matrix. A  register select (RS) pin that controls were in the LCDs memory you're writing data to A  Read/Write (R/W) pin that selects reading mode or writing mode  An Enable pin that enables writing to the registers  8 data pins (D0-D7) .  The states of these pins (high or low)are the bits that you're writing to a register when you write or the values you're reading when you read  there is also a display contrast pin (v0), power supply pins (+5v and Gnd ), and LED backlight (+a,-k) pins that you can use to power the LCD, control the display contrast and turn on and off the LED backlight, respectively the Liquid Crystal Library  <LiquidCrystal.h>  Interfacing 16x2 LCD...