I2C.py

import smbus
import time
# for RPI version 1, use "bus = smbus.SMBus(0)"
bus = smbus.SMBus(1)
 
# This is the address we setup in the Arduino Program
address = 0x04
 
def writeNumber(value):
    bus.write_byte(address, value)
    # bus.write_byte_data(address, 0, value)
    return -1
 
def readNumber():
    number = bus.read_byte(address)
    # number = bus.read_byte_data(address, 1)
    return number
 
while True:
    var = input("Enter 1 - 255: ")
    if not var:
        continue
 
    writeNumber(var)
    print "RPI: Hi Arduino, I sent you ", var
    # sleep one second
    time.sleep(1)
 
    number = readNumber()
    print "Arduino: Hey RPI, I received a digit ", number
    print