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, int(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 – 9: “)
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)