# 接线图

# 树莓派管脚图

# 代码

# C

#include <stdio.h>
#include <wiringPi.h>
#include <pcf8591.h>
#define PCF       120
int main (void)
{
	int value ;
	wiringPiSetup () ;
	// Setup pcf8591 on base pin 120, and address 0x48
	pcf8591Setup (PCF, 0x48) ;
	while(1) // loop forever
	{
		value = analogRead  (PCF + 3) ;
		printf("%d\n", value);
		analogWrite (PCF + 0, value) ;
		delay (10) ;
	}
	return 0 ;
}

编译命令: gcc pcf8591.c -o pcf8591 -lwiringPi

# Python

#!/usr/bin/env python
import PCF8591 as ADC
def setup():
	ADC.setup(0x48)
def loop():
	while True:
		print ADC.read(0)
		ADC.write(ADC.read(3))
def destroy():
	ADC.write(0)
if __name__ == "__main__":
	try:
		setup()
		loop()
	except KeyboardInterrupt:
		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)
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