Hello,
How to start this board i have buy it is there any need of the power supply adaptor??
how to blink led from it for testing??

 

Read up on it, Ritesh.

 

Plug it to usb port. The On light will turn on.

 

Hello,

Ever heard about search engines for internet?
Arduino uno
I found this using it:
https://www.arduino.cc/en/Guide/ArduinoUno

Bertus

 

what is use of adapter pin and what is rating 5V or 12V?

 

Hello,

Did you read the specs?

Technical specs
Microcontroller ATmega328P
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
PWM Digital I/O Pins 6
Analog Input Pins 6
DC Current per I/O Pin 20 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328P)
of which 0.5 KB used by bootloader
SRAM 2 KB (ATmega328P)
EEPROM 1 KB (ATmega328P)
Clock Speed 16 MHz
LED_BUILTIN 13
Length 68.6 mm
Width 53.4 mm
Weight 25 g

This was found on this page:
https://www.arduino.cc/en/Main/ArduinoBoardUno

Bertus

 

what is use of adapter pin and what is rating 5V or 12V?

The DC input adaptor requires a 9V DC supply, which powers the onboard 5V and 3.3V regulators.

When connected to a PC via a USB, the 5V is supplied by the PC/USB, the external 9V DC input is not required.

Read the spec' Bertus has posted to get a complete picture of the Voltage source requirements.

 

how to do write code for led flashing in it?

 

You can try the codes here

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
  This example code is in the public domain.
*/

void setup() {               
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(13, OUTPUT);    
}

void loop() {
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

Allen

 

Hello,

Did you look at the page I gave you before?
There is an image to follow, wich will give you the example program for blink:

Bertus

 

for pwm what to do??

so i have to connect 9V adaptor?
not 5V not 12V

 

in which language aurdino is written??

 

Hello,

The arduino is programmed in C using special functions.
More info can be found here:
https://www.arduino.cc/en/Tutorial/HomePage
https://www.arduino.cc/en/Reference/HomePage

Bertus

 

for pwm what to do??

so i have to connect 9V adaptor?
not 5V not 12V

The specification states:
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V

Many users connect a 9V PP3 battery for simple tests.

 

how to make pwm in it?

 

Hello,

Have a look at this page:
https://www.arduino.cc/en/Tutorial/PWM

The page was found using the following query:
pwm tutorial "arduino uno"

Bertus

 

how to make pwm in it?

Instead of peppering us with trivial questions, Ritesh, read the online documentation at the Arduino web site. Also, note that the Arduino web site has a discussion forum; you can-- and should-- ask your Arduino questions there.