button

Button instructions

import serial
s = serial.Serial('/dev/ttyUSB0', 0)
s.setDTR(level=True)
>>> s.getCD()
False
>>> s.getCD()
True
>>> s.getCD()
True



while True:                                                                                                                                                                                                                         
  p = s.getCD()                                                                                                                                                                                                                         
  if p != pressed:                                                                                                                                                                                                                     
    print p                                                                                                                                                                                                                         
    pressed = p                                                                                                                                                                                                                         
  time.sleep(0.1)



sudoedit /etc/udev/rules.d/50-ttyusb.rules

KERNEL=="ttyUSB[0-9]*",NAME="tts/USB%n",SYMLINK+="%k",GROUP="uucp",MODE="0666"