pcf8591-adc-via-i2c

ice long

Re: Incorrect readings from PCF8591 ADC via I2C
Sorry as much as I try to follow the example does not work or at least does not show the same results I built this, but I do not see where I screwed up

#!/usr/bin/env python

from OmegaExpansion import onionI2C
import time
import curses

2014-08-26 PCF8591-x.py

Connect Pi 3V3 - VCC, Ground - Ground, SDA - SDA, SCL - SCL.

./PCF8591-x.py

bus = onionI2C.OnionI2C()

stdscr = curses.initscr()
curses.noecho()
curses.cbreak()
aout = 0

stdscr.addstr(10, 0, "Brightness")
stdscr.addstr(12, 0, "Temperature")
stdscr.addstr(14, 0, "AOUT->AIN2")
stdscr.addstr(16, 0, "Resistor")

stdscr.nodelay(1)

try:
while True:

  for a in range(0,4):
     aout = aout + 1
     bus.writebytes(0x48,0x40 | ((a+1) & 0x03), aout)
     v = bus.readbyte(0x48)
     hashes = v / 4
     spaces = 64 - hashes
     stdscr.addstr(10+a*2, 12, str(v) + ' ')
  stdscr.refresh()
  time.sleep(0.04)

  c = stdscr.getch()

  if c != curses.ERR:
     break

except:
pass

curses.nocbreak()
curses.echo()
curses.endwin()