树莓派-PS2操作杆实验

#!/usr/bin/env python

#------------------------------------------------------

#

#		This is a program for JoystickPS2 Module.

#

#		This program depend on PCF8591 ADC chip. Follow 

#	the instruction book to connect the module and 

#	ADC0832 to your Raspberry Pi.

#

#------------------------------------------------------

import PCF8591 as ADC 

import time

def setup():

	ADC.setup(0x48)					# Setup PCF8591

	global state

def direction():	#get joystick result

	state = ['home', 'up', 'down', 'left', 'right', 'pressed']

	i = 0

	if ADC.read(0) <= 5:

		i = 1		#up

	if ADC.read(0) >= 250:

		i = 2		#down

	if ADC.read(1) >= 250:

		i = 3		#left

	if ADC.read(1) <= 5:

		i = 4		#right

	if ADC.read(2) == 0:

		i = 5		# Button pressed

	if ADC.read(0) - 125 < 15 and ADC.read(0) - 125 > -15	and ADC.read(1) - 125 < 15 and ADC.read(1) - 125 > -15 and ADC.read(2) == 255:

		i = 0

	return state[i]

def loop():

	status = ''

	while True:

		tmp = direction()

		if tmp != None and tmp != status:

			print tmp

			status = tmp

def destroy():

	pass

if __name__ == '__main__':		# Program start from here

	setup()

	try:

		loop()

	except KeyboardInterrupt:  	# When 'Ctrl+C' is pressed, the child program destroy() will be  executed.

		destroy()

#!/usr/bin/env python

#------------------------------------------------------

#

#		This is a program for PCF8591 Module.

#

#		Warnng! The Analog input MUST NOT be over 3.3V!

#    

#		In this script, we use a poteniometer for analog

#   input, and a LED on AO for analog output.

#

#		you can import this script to another by:

#	import PCF8591 as ADC

#	

#	ADC.Setup(Address)  # Check it by sudo i2cdetect -y -1

#	ADC.read(channal)	# Channal range from 0 to 3

#	ADC.write(Value)	# Value range from 0 to 255		

#

#------------------------------------------------------

import smbus

import time

# for RPI version 1, use "bus = smbus.SMBus(0)"

bus = smbus.SMBus(1)

#check your PCF8591 address by type in 'sudo i2cdetect -y -1' in terminal.

def setup(Addr):

	global address

	address = Addr

def read(chn): #channel

	if chn == 0:

		bus.write_byte(address,0x40)

	if chn == 1:

		bus.write_byte(address,0x41)

	if chn == 2:

		bus.write_byte(address,0x42)

	if chn == 3:

		bus.write_byte(address,0x43)

	bus.read_byte(address) # dummy read to start conversion

	return bus.read_byte(address)

def write(val):

	temp = val # move string value to temp

	temp = int(temp) # change string to integer

	# print temp to see on terminal else comment out

	bus.write_byte_data(address, 0x40, temp)

if __name__ == "__main__":

	setup(0x48)

	while True:

		print 'AIN0 = ', read(0)

		print 'AIN1 = ', read(1)

		tmp = read(0)

		tmp = tmp*(255-125)/255+125 # LED won't light up below 125, so convert '0-255' to '125-255'

		write(tmp)

#		time.sleep(0.3)