How to Install Arduino for Mac OS X

This Article will show you how to install and test the Arduino software on a Mac computer running OSX.

1.Go to the Arduino downloads page and click the Mac OS X link to download a file containing a copy of the Arduino application for Mac OS X.

2.Plug the square end of the USB cable into the Arduino and the flat end into an available port on your Mac to connect the Arduino to your computer.

As soon as the board is connected, a dialog box appears, showing the message A new network interface has been detected.

3.Click Network Preferences, and in the window that appears, click Apply.

Note that your Arduino is displayed in the list on the left side of this window as Not Configured, but don’t worry, the software is installed and your Arduino board will work.

4.Close the Network Preferences window.

To launch the Arduino application, go to your Applications folder, locate the Arduino application, drag it to the Dock, and then click the Arduino icon to open the Arduino application. If you prefer, you can also drag the application to the desktop to create an alias there instead.

5.Launch and Blink!

After following the appropriate steps for your software install, we are now ready to test your first program with your Arduino board!

• Launch the Arduino application
• If you disconnected your board, plug it back in
• Open the Blink example sketch by going to: File > Examples > 1.Basics > Blink

Select the type of Arduino board : Tools > Board > your board type

Select the serial port that your Arduino is attached to: Tools > Port > xxxxxx (it’ll probably look something like “/dev/tty.usbmodemfd131” or “/dev/tty.usbserial-131” but probably with a different number)

With your Arduino board connected and the Blink sketch open, press the ‘Upload’ button

• If everything worked, the onboard LED on your Arduino should now be blinking! You just programmed your first Arduino!

If your are attach external LED on pin 13 you need to 1k (Ohm) resistor & any color led , some jumper ware .

Why use 1k resistor ?

normally Arduino output pin are provide 5v but our led are 3.5v , so we decrees some voltage using 1k resistor, for details you need to sturdy voltage divider rules V=IR