how to burn atmega328p bootloader and power circuit

                       how to burn bootloader atmega328p

first you must upload the arduino isp programme  in to the arduino uno board like this

after uploading you must remove the power to arduino board and connect the wire like this
to board

arduino sonar system

                     Arduino sonar system 

in this project we need ultrasonic sensor 

and processing software for processing 

the processing software link is here
http://playground.arduino.cc/Interfacing/Processing
firs you must connect the arduino board to computer and upload the arduino code after you must open the processing software  and upload the processing code and run 

you must choose the serial port from processing code 


the processing code is here 

arduino ultrasonic sensor project

       Arduino ultrasonic sensor project 

the circuit is follow

in this project we program for when the distance <100cm the led is on 

and else led is off 

in this project we need 

• arduino board
• ultrasonic sensor
• led 

in this project the distance can show on the serial monitor 

the code is follow 

arduino LDR controller

                    Arduino LDR controller 


the circuit diagram here

FIRST YOU MUST GET THE VALUE FROM THE LDR READING FOR WHAT BRIGHTNESS
YOU WANT TO  CONTROL WITH THE SERIAL MONITOR 

the ldr value reading cord is here