# Pyduino SMS
# by Dylan V, free to copy/edit/distribute
# A simple[r] Python-Arduino bridge, based on the Simple Message System protocol.
# Requires SMS library and SMS example sketch to be loaded on board.
# For USB Arduinos, please change baudrate in sketch to 115200.

import serial, atexit

__version__ = "0.2"
# This is alpha code, written by a novice. Syntax/structure changes are extremely welcome.
debug = True
global comm

class arduino:
   def __init__(self, port, baudrate=115200):
      try: self.comm = serial.Serial(port, baudrate, timeout=0.25)
      except: print "Could not connect to Arduino at specified port."
      if debug: print "Serial connection established at port %s." % port
      atexit.register(self.disconnect)

   def read_digital(self, pin):
      if pin in range(2, 14):
         self.comm.write("r d\r")
         result = self.comm.readline().split()[1:][pin - 2]
         if debug: print "Read digital pin %s, value was %s" % (str(pin), result)
         if result == "": return None
         else: return int(result)

   def read_analog(self, pin):
      if pin in range(6):
         self.comm.write("r a\r")
         result = self.comm.readline().split()[1:][pin]
         if debug: print "Read analog pin %s, value was %s" % (str(pin), result)
         if result == "": return None
         else: return int(result)

   def write_digital(self, pin, val):
      if pin in range(2, 14) and val in [0, 1]:
         self.comm.write("w d %s %s\r" % (pin, str(val)))
         if debug: print "Wrote value %s to digital pin %s" % (str(val), pin)

   def write_analog(self, pin, val):
      if pin in [3, 5, 6, 9, 10, 11] and val in range(256):
         self.comm.write("w a %s %s\r" % (pin, str(val)))
         if debug: print "Wrote value %s to pwm pin %s" % (str(val), pin)

   def disconnect(self):
      if self.comm: self.comm.close()
      if debug: print "Serial connection closed."