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idata
Community Manager
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Blinking an LED with Galileo Gen 2 and Python

With embedded widgets blinking an LED is the equivalent of "Hello World". I could not find an example of using python to blink an LED here so I thought I would share this. Hopefully this will save someone some time when they want to blink an LED using MRAA and Python. I have only used/tested this with the Galileo Gen 2 built with the EGLIBC image: http://downloadmirror.intel.com/25384/eng/iot-devkit-201510010757-mmcblkp0-galileo.direct.xz http://downloadmirror.intel.com/25384/eng/iot-devkit-201510010757-mmcblkp0-galileo.direct.xz.

0 . First is to install mraa

opkg update

opkg install mraa

1. Next you open python and import MRAA.

import mraa

2. Then initialize the pin, in this example I am using digital pin 12.

pin = mraa.Gpio(12)

3. Next set the pin to output mode.

pin.dir(MRAA.DIR_OUT)

4. And then set it high or low to turn it on or off.

pin.write(0)

All together in one script using digital pin 12 and blinking on/off ever second.

# !/usr/bin/env python

import mraa

import time

 

pin = mraa.Gpio(12)

pin.dir(MRAA.DIR_OUT)

while True:

pin.write(1)

time.sleep(1)

pin.write(0)

time.sleep(1)

It is just that easy!

You can download a script here that does it all for you : https://github.com/joemcmanus/led GitHub - joemcmanus/led: Intel Galileo LED python script

Use:

root@galileo:~# ./led.py 1

Blinking LED 1

Using delay 10 and for 0 attempts

Turning LED 1 on, for 10 seconds, count 0.

root@galileo:~ ./led.py --help

usage: led.py [-h] [--count COUNT] [--delay DELAY] [--version] pinNumber

Simple LED Blinker for Galileo

positional arguments:

pinNumber Specify the pin number, i.e. 0-13

optional arguments:

-h, --help show this help message and exit

--count COUNT Number of times to execute, default infinity

--delay DELAY Number of seconds to wait between blinkings, default 10

--version show program's version number and exit

Cheers,

-Joe

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