i2c_attiny.py

#!/bin/python

import smbus
import time

# This is the address we setup in the Arduino Program
address = 0x2d

def writeNumber(value):

  try:

    bus.write_byte(address, value)
    # bus.write_byte_data(address, 0, value)
    return -1

  except Exception:
      pass

def readNumber():

  try:

    number = bus.read_byte(address)
    # number = bus.read_byte_data(address, 1)
    return number

  except Exception:
      pass

while True:

  # for RPI version 1, use "bus = smbus.SMBus(0)"
  global bus

  try:

    # Commands to send via i2c:
    #
    # 0x01 --> Buzzer ON, LEDs OFF
    # 0x10 --> Buzzer OFF, LEDs ON
    # 0x11 --> Buzzer ON, LEDs ON

    var = input("Enter an option: ")

    if not var or (var != 0x01 and var != 0x10 and var != 0x11):
        continue

    bus = smbus.SMBus(1)

    time.sleep(1)

    writeNumber(var)

    print "Sending input to Attiny85 ", var

    number = readNumber()

    print "Attiny85 received an option: ", number
    print ""

    time.sleep(2)

    writeNumber(0x00)

    time.sleep(20)

  except Exception:
    print "reset bus"
    pass
  except KeyboardInterrupt:
    quit()