2008 304 - Revision history

Michael Murtaugh at 10:36, 22 May 2008

2008-05-22T10:36:09Z

← Older revision		Revision as of 12:36, 22 May 2008
Line 57:		Line 57:
	print line		print line
	</source>		</source>


			And now combined with a simple PyGame program to visualize the sensor data received from Arduino:

	<source lang="python">		<source lang="python">

Michael Murtaugh at 10:35, 22 May 2008

2008-05-22T10:35:17Z

← Older revision		Revision as of 12:35, 22 May 2008
Line 46:		Line 46:

	Python / [[PyGame]]		Python / [[PyGame]]

			A simple Python script to test a "call & respond" session with the arduino:

			<source lang="python">
			import serial
			ser = serial.Serial('/dev/ttyUSB0', 9600) # your serial port may be different
			while 1:
			ser.write('x') # call
			line = ser.readline() # and read the response
			print line
			</source>

	<source lang="python">		<source lang="python">
Line 53:		Line 64:

	import serial		import serial
	ser = serial.Serial('/dev/~~ttyUSB1~~', 9600)		ser = serial.Serial('/dev/ttyUSB0', 9600)

	def main():		def main():

Michael Murtaugh at 10:25, 22 May 2008

2008-05-22T10:25:20Z

← Older revision		Revision as of 12:25, 22 May 2008
Line 54:		Line 54:
	import serial		import serial
	ser = serial.Serial('/dev/ttyUSB1', 9600)		ser = serial.Serial('/dev/ttyUSB1', 9600)


	def main():		def main():
Line 66:		Line 65:
	background = pygame.Surface(SCREENRECT.size).convert()		background = pygame.Surface(SCREENRECT.size).convert()
	background.fill((0, 255, 0))		background.fill((0, 255, 0))
	~~screen.blit(background, (0,0))~~
	~~pygame.display.update()~~

	~~# keep track of sprites~~
	~~all = pygame.sprite.[[RenderUpdates]]()~~

	# keep track of time		# keep track of time
	clock = pygame.time.Clock()		clock = pygame.time.Clock()
Line 94:		Line 87:
	s1 = int(s1)		s1 = int(s1)
	s2 = int(s2)		s2 = int(s2)
	except [[ValueError]]:		except ValueError:
	pass		pass

	# print analog		# print analog

	if min_analog == None or analog ~~<~~ min_analog:		if min_analog == None or analog < min_analog:
	min_analog = analog		min_analog = analog

	if max_analog == None or analog ~~>~~ max_analog:		if max_analog == None or analog > max_analog:
	max_analog = analog		max_analog = analog

Line 119:		Line 112:
	pygame.draw.circle(screen, (255, 255, 0), pos, r)		pygame.draw.circle(screen, (255, 255, 0), pos, r)

			# draw to screen!
	pygame.display.update()		pygame.display.update()

	# maintain frame rate		# maintain frame rate
	clock.tick(30)		clock.tick(30)

	if __name__ == "__main__": main()		if __name__ == "__main__": main()

	</source>		</source>

Michael Murtaugh: /* Example Programs */

2008-05-22T09:54:34Z

Example Programs

← Older revision		Revision as of 11:54, 22 May 2008
Line 28:		Line 28:
	void loop() // run over and over again		void loop() // run over and over again
	{		{
	if (Serial.available() < 0) {		if (Serial.available() > 0) {
	int inByte = Serial.read();		int inByte = Serial.read();

Michael Murtaugh: /* Example Programs */

2008-05-22T09:54:19Z

Example Programs

← Older revision		Revision as of 11:54, 22 May 2008
Line 21:		Line 21:
	void setup() // run once, when the sketch starts		void setup() // run once, when the sketch starts
	{		{
	: Serial.begin(9600);		Serial.begin(9600);
	: pinMode(resetButton, INPUT); // sets the digital pin as output		pinMode(resetButton, INPUT); // sets the digital pin as output
	: pinMode(serveButton, INPUT); // sets the digital pin as output		pinMode(serveButton, INPUT); // sets the digital pin as output
	}		}

	void loop() // run over and over again		void loop() // run over and over again
	{		{
	: if (Serial.available() ~~>~~ 0) {		if (Serial.available() < 0) {
	: int inByte = Serial.read();		int inByte = Serial.read();
	:
	: a1_value = analogRead(a1_port);		a1_value = analogRead(a1_port);
	: reset = digitalRead(resetButton);		reset = digitalRead(resetButton);
	: serve = digitalRead(serveButton);		serve = digitalRead(serveButton);
	:
	: Serial.print(a1_value);		Serial.print(a1_value);
	: Serial.print(",");		Serial.print(",");
	: Serial.print(reset);		Serial.print(reset);
	: Serial.print(",");		Serial.print(",");
	: Serial.println(serve);		Serial.println(serve);
	: }		}
	}		}
	</source>		</source>

Michael Murtaugh at 11:02, 21 May 2008

2008-05-21T11:02:20Z

← Older revision		Revision as of 13:02, 21 May 2008
Line 6:		Line 6:

	* [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law]		* [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law]


	== Example Programs ==		== Example Programs ==

Michael Murtaugh at 11:01, 21 May 2008

2008-05-21T11:01:55Z

New page

Some websites:
* http://www.arduino.cc/
* http://www.dannyg.com/examples/res2/resistor.htm

Hardware hacking with arduino

* [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law]

== Example Programs ==

Arduino:

<source lang="c">
int a1_port = 0; // LED connected to digital pin 13
int a1_value = 0;
int resetButton = 2;
int serveButton = 3;
int reset = 0;
int serve = 0;

void setup() // run once, when the sketch starts
{
: Serial.begin(9600);
: pinMode(resetButton, INPUT); // sets the digital pin as output
: pinMode(serveButton, INPUT); // sets the digital pin as output
}

void loop() // run over and over again
{
: if (Serial.available() > 0) {
: int inByte = Serial.read();
:
: a1_value = analogRead(a1_port);
: reset = digitalRead(resetButton);
: serve = digitalRead(serveButton);
:
: Serial.print(a1_value);
: Serial.print(",");
: Serial.print(reset);
: Serial.print(",");
: Serial.println(serve);
: }
}
</source>

Python / [[PyGame]]

<source lang="python">
import pygame
from pygame.locals import *
SCREENRECT = Rect(0, 0, 640, 480)

import serial
ser = serial.Serial('/dev/ttyUSB1', 9600)

def main():
(min_analog, max_analog) = (None, None)
avalue = 0

pygame.init()
screen = pygame.display.set_mode(SCREENRECT.size, 0)

# make background
background = pygame.Surface(SCREENRECT.size).convert()
background.fill((0, 255, 0))
screen.blit(background, (0,0))
pygame.display.update()

# keep track of sprites
all = pygame.sprite.[[RenderUpdates]]()

# keep track of time
clock = pygame.time.Clock()

# game loop
while 1:

# get input
for event in pygame.event.get():
if event.type == QUIT or \
(event.type == KEYDOWN and \
event.key == K_ESCAPE):
return

ser.write("x")
arduino_data = ser.readline()
# print arduino_data

try:
(analog, s1, s2) = arduino_data.split(",")
analog = int(analog)
s1 = int(s1)
s2 = int(s2)
except [[ValueError]]:
pass

# print analog

if min_analog == None or analog < min_analog:
min_analog = analog

if max_analog == None or analog > max_analog:
max_analog = analog

if (max_analog != min_analog):
avalue = float(analog - min_analog) / (max_analog - min_analog)

bgcolor = (0, 0, 0)
if s1: bgcolor=(255, 255, 0)
background.fill(bgcolor)
screen.blit(background, (0,0))

r = avalue * SCREENRECT[3] / 2
pos = (SCREENRECT[2] / 2, SCREENRECT[3]/2)
# print r, pos
pygame.draw.circle(screen, (255, 255, 0), pos, r)

pygame.display.update()

# maintain frame rate
clock.tick(30)

if __name__ == "__main__": main()

</source>