Getting started with Raspberry Pi - Revision history

Lvosandi: /* Blinking a LED */

2016-09-20T15:24:44Z

Blinking a LED

← Older revision		Revision as of 18:24, 20 September 2016
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	=Blinking a LED=		=Blinking a LED=

	In the following examples the LED is connected to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18:		In the following examples the LED is connected to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 10:

	[[File:~~Raspberry-pi-gpio-18-~~led bb.png\|~~600px~~]]		[[File:rpi led.png\|400px]]


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	sudo su		sudo su

	Then you have to export gpio number 18		Then you have to export gpio number 10

	echo 18 > /sys/class/gpio/export		echo 10 > /sys/class/gpio/export

	After that is done you have to set the direction of the GPIO pin, in this case you have to set it to out direction.		After that is done you have to set the direction of the GPIO pin, in this case you have to set it to out direction.

	echo out > /sys/class/gpio/~~gpio18~~/direction		echo out > /sys/class/gpio/gpio10/direction

	And now you can blink your led on and off.		And now you can blink your led on and off.

	# Turn the led on		# Turn the led on
	echo 1 > /sys/class/gpio/~~gpio18~~/value		echo 1 > /sys/class/gpio/gpio10/value

	# Turn the led off		# Turn the led off
	echo 0 > /sys/class/gpio/~~gpio18~~/value		echo 0 > /sys/class/gpio/gpio10/value

	# blink the led forever with 1 second interval		# blink the led forever with 1 second interval
	while true; do echo 1 > /sys/class/gpio/~~gpio18~~/value; sleep 1; echo 0 > /sys/class/gpio/~~gpio18~~/value; sleep 1; done		while true; do echo 1 > /sys/class/gpio/gpio10/value; sleep 1; echo 0 > /sys/class/gpio/gpio10/value; sleep 1; done

	==Blinking LED from Python script==		==Blinking LED from Python script==
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	from time import sleep		from time import sleep

	led = 18 # GPIO number where the led is connected		led = 10 # GPIO number where the led is connected

	# Tell the GPIO module to use GPIO numbering used by processor		# Tell the GPIO module to use GPIO numbering used by processor
	GPIO.setmode(GPIO.BCM)		GPIO.setmode(GPIO.BCM)

	# Set GPIO no 18 to output mode		# Set GPIO no 10 to output mode
	GPIO.setup(led, GPIO.OUT)		GPIO.setup(led, GPIO.OUT)

Lvosandi at 09:26, 14 September 2016

2016-09-14T09:26:32Z

← Older revision		Revision as of 12:26, 14 September 2016
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	Download and uncompress Raspbian:		Download and uncompress Raspbian:

	wget ~~https~~://~~downloads~~.~~raspberrypi~~.~~org~~/raspbian~~/images/raspbian-2015-05~~-~~07/2015~~-05-05-~~raspbian-wheezy~~.zip		wget http://upload.itcollege.ee/raspbian-jessie-2016-05-27.zip
	unzip ~~2015~~-05-05-~~raspbian-wheezy~~.zip		unzip raspbian-jessie-2016-05-27.zip

	For Linux there is no need to fetch extra tools to write the image to a SD card, simply use <code>dd</code>:		For Linux there is no need to fetch extra tools to write the image to a SD card, simply use <code>dd</code>:

Lvosandi: /* Blinking LED from Python script */

2015-09-30T14:48:43Z

Blinking LED from Python script

← Older revision		Revision as of 17:48, 30 September 2015
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	# Tell the GPIO module to use GPIO numbering used by processor		# Tell the GPIO module to use GPIO numbering used by processor
	GPIO.setmode(GPIO.BCM)		GPIO.setmode(GPIO.BCM)

	# Set GPIO no 18 to output mode		# Set GPIO no 18 to output mode
	GPIO.setup(led, GPIO.OUT)		GPIO.setup(led, GPIO.OUT)

Lvosandi: /* Powering up */

2015-09-30T07:21:37Z

Powering up

← Older revision		Revision as of 10:21, 30 September 2015
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	Use [http://eclipsesource.com/blogs/wp-content/uploads/2012/10/3dr-radio-to-RasPi_marked.jpg-e1350422181130.png USB-UART bridge to power up Raspberry Pi] and gain access to the command-line.		Use [http://eclipsesource.com/blogs/wp-content/uploads/2012/10/3dr-radio-to-RasPi_marked.jpg-e1350422181130.png USB-UART bridge to power up Raspberry Pi] and gain access to the command-line.

			[[File:Raspberry-pi-uart bb.png\|600px]]

	[[File:RaspberryPi_serial_wiring.jpeg\|800px]]		[[File:RaspberryPi_serial_wiring.jpeg\|800px]]


	=Accessing command-line=		=Accessing command-line=

Lvosandi at 07:19, 30 September 2015

2015-09-30T07:19:11Z

@@ Line 31: / Line 31: @@
 Use [http://eclipsesource.com/blogs/wp-content/uploads/2012/10/3dr-radio-to-RasPi_marked.jpg-e1350422181130.png USB-UART bridge to power up Raspberry Pi] and gain access to the command-line.
@@ Line 127: / Line 111: @@
 =Blinking a LED=
-The LED is connected to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18, see circuit [http://pi4j.com/images/gpio-control-example-large.png here].
+In the following examples the LED is connected to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18:
 ==Blinking from the terminal==

Lvosandi: /* Blinking a LED */

2015-09-29T18:37:19Z

Blinking a LED

← Older revision		Revision as of 21:37, 29 September 2015
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	=Blinking a LED=		=Blinking a LED=

	~~A led~~ is connected ~~to each RaspberryPi on~~ to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18, see circuit [http://pi4j.com/images/gpio-control-example-large.png here].		The LED is connected to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18, see circuit [http://pi4j.com/images/gpio-control-example-large.png here].

	==Blinking from the terminal==		==Blinking from the terminal==

	Raspbian has driver loaded for GPIO pins, so you can control them from shell ~~programatically~~.		Raspbian has driver loaded for GPIO pins, so you can control them from shell programmatically.

	To blink it from terminal you first have to become a root user.		To blink it from terminal you first have to become a root user.

Lvosandi: /* Blinking a LED */

2015-09-29T18:32:44Z

Blinking a LED

← Older revision		Revision as of 21:32, 29 September 2015
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	=Blinking a LED=		=Blinking a LED=

	A led is connected to each RaspberryPi on to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18.		A led is connected to each RaspberryPi on to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18, see circuit [http://pi4j.com/images/gpio-control-example-large.png here].

	==Blinking from the terminal==		==Blinking from the terminal==

Lvosandi at 07:02, 25 September 2015

2015-09-25T07:02:04Z

← Older revision		Revision as of 10:02, 25 September 2015
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	=Blinking a LED=		=Blinking a LED=

	A led is connected to each RaspberryPi on to GPIO 18.		A led is connected to each RaspberryPi on to [https://en.wikipedia.org/wiki/General-purpose_input/output GPIO] pin 18.

	==Blinking from the terminal==		==Blinking from the terminal==

			Raspbian has driver loaded for GPIO pins, so you can control them from shell programatically.

	To blink it from terminal you first have to become a root user.		To blink it from terminal you first have to become a root user.
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	echo 18 > /sys/class/gpio/export		echo 18 > /sys/class/gpio/export

	After that is done you have to set the direction of the ~~gpio~~ pin, in this case you have to set it to out direction.		After that is done you have to set the direction of the GPIO pin, in this case you have to set it to out direction.

	echo out > /sys/class/gpio/gpio18/direction		echo out > /sys/class/gpio/gpio18/direction
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	# blink the led forever with 1 second interval		# blink the led forever with 1 second interval
	while true; do echo 1 > /sys/class/gpio/gpio18/value; sleep 1; echo 0 > /sys/class/gpio/gpio18/value; done		while true; do echo 1 > /sys/class/gpio/gpio18/value; sleep 1; echo 0 > /sys/class/gpio/gpio18/value; sleep 1; done

	==Blinking ~~with a~~ Python script==		==Blinking LED from Python script==

	Save this script as a blink.py in the ~~raspberry pi~~ home directory.		Save this script as a <code>blink.py</code> in the Raspberry Pi home directory.
	You can use ~~program called~~ nano to do that		You can use command-line text editor <code>nano</code> to do that, or open up the file remotely with <code>sftp://</code> or WinSCP.

	nano blink.py		nano blink.py

	In nano Ctrl+O writes the file to the disk and Ctrl+X ~~exits nano~~.		In <code>nano</code> Ctrl-O writes the file to the disk and Ctrl-X returns back to command-line.

	The blink.py script		The blink.py script:

	# import Raspberry Pi ~~gpio~~ support into ~~python~~		# import Raspberry Pi GPIO support into Python environment
	import RPi.GPIO as GPIO		import RPi.GPIO as GPIO
	# import a sleep function from time module		# import a sleep function from time module
	from time import sleep		from time import sleep

	led = 18 # ~~gpio~~ number where the led is connected		led = 18 # GPIO number where the led is connected

	# Tell the GPIO module to use ~~gpio~~ numbering used by ~~cpu~~		# Tell the GPIO module to use GPIO numbering used by processor
	GPIO.setmode(GPIO.BCM)		GPIO.setmode(GPIO.BCM)
	# Set ~~gpio nr~~ 18 to output mode
			# Set GPIO no 18 to output mode
	GPIO.setup(led, GPIO.OUT)		GPIO.setup(led, GPIO.OUT)

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	sudo python blink.py		sudo python blink.py

	===Minimal HTTP server in Python===		==Minimal HTTP server in Python==

	This is a Python 2 webserver example.		This is a Python 2 webserver example.
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	else:		else:
	print("user asked for something else")		print("user asked for something else")
	return "Hello"		return "Hello world!"

	# Create a small python server		# Create a small python server

Arzirk: fix the code

2015-09-24T13:17:55Z

fix the code

← Older revision		Revision as of 16:17, 24 September 2015
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	# Create a small python server		# Create a small python server
	httpd = make_server('', 8000, simple_app)		httpd = make_server("", 8000, simple_app)
	print "Serving on port 8000..."		print "Serving on port 8000..."
	print "You can open this in the browser http://192.168.1.xxx:8000 where xxx is your rpi ip aadress"		print "You can open this in the browser http://192.168.1.xxx:8000 where xxx is your rpi ip aadress"
	print "Or if you run this server on your own computer then http://localhost:8000"		print "Or if you run this server on your own computer then http://localhost:8000"
	httpd.serve_forever()		httpd.serve_forever()

Arzirk: added a simple python webserver snippet

2015-09-24T13:09:17Z

added a simple python webserver snippet

← Older revision		Revision as of 16:09, 24 September 2015
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	sudo python blink.py		sudo python blink.py

			===Minimal HTTP server in Python===

			This is a Python 2 webserver example.

			# make_server is used to create this simple python webserver
			from wsgiref.simple_server import make_server

			# Function that is ran when a http request comes in
			def simple_app(env, start_response):

			# set some http headers that are sent to the browser
			status = '200 OK'
			headers = [('Content-type', 'text/plain')]
			start_response(status, headers)

			# What did the user ask for?
			if env["PATH_INFO"] == "/on":
			print("user asked for /on")
			return "got on"
			elif env["PATH_INFO"] == "/off":
			print("user asked for /off")
			return "got off"
			else:
			print("user asked for something else")
			return "Hello"

			# Create a small python server
			httpd = make_server('', 8000, simple_app)
			print "Serving on port 8000..."
			print "You can open this in the browser http://192.168.1.xxx:8000 where xxx is your rpi ip aadress"
			print "Or if you run this server on your own computer then http://localhost:8000"
			httpd.serve_forever()