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Turn Raspberry Pi LED On and Off

This example shows how to turn the on-board LED on and off.

Create a connection to the Raspberry Pi® hardware using raspi.

mypi = raspi
mypi = 

  raspi with properties:

           DeviceAddress: 'raspberrypi-computername'
                    Port: 18725
               BoardName: 'Raspberry Pi Model B Rev 2'
           AvailableLEDs: {'led0'}
    AvailableDigitalPins: [4 14 15 17 18 22 23 24 25 27 30 31]
    AvailableSPIChannels: {}
      AvailableI2CBuses: {'i2c-0'  'i2c-1'}
             I2CBusSpeed: 100000

  Supported peripherals

The AvailableLEDs property shows the name of the user-controllable LED.

To show the location of the user-controllable LED on the board, use showLEDs.


Turn the specified LED on by setting its value to 1 or true.


Turn the LED off by setting its value to 0 or false.


To restore the LED to its default purpose, which is to indicate SD card activity, restart the Raspberry Pi hardware.