first re-commit.

pigpio-master/EXAMPLES/Python/PCF8591_YL-40/PCF8591.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+# 2014-08-26 PCF8591.py
+
+import time
+import curses
+
+import pigpio
+
+# sudo pigpiod
+# ./PCF8591.py
+
+# Connect Pi 3V3 - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
+
+YL_40=0x48
+
+pi = pigpio.pi() # Connect to local Pi.
+
+handle = pi.i2c_open(1, YL_40, 0)
+ 
+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
+         pi.i2c_write_byte_data(handle, 0x40 | ((a+1) & 0x03), aout&0xFF)
+         v = pi.i2c_read_byte(handle)
+         hashes = v / 4
+         spaces = 64 - hashes
+         stdscr.addstr(10+a*2, 12, str(v) + ' ')
+         stdscr.addstr(10+a*2, 16, '#' * hashes + ' ' * spaces )
+
+      stdscr.refresh()
+      time.sleep(0.04)
+
+      c = stdscr.getch()
+
+      if c != curses.ERR:
+         break
+
+except:
+   pass
+
+curses.nocbreak()
+curses.echo()
+curses.endwin()
+
+pi.i2c_close(handle)
+pi.stop()
+

pigpio-master/EXAMPLES/Python/PCF8591_YL-40/README

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+Script to display readings from the (I2C) PCF8591.
+