This is the code to run on raspberry pi for an interactive pi-day poster

raspberrypipicalc.py

#!/usr/bin/python
# Example using a character LCD connected to a Raspberry Pi or BeagleBone Black.
import time

import Adafruit_CharLCD as LCD
import Adafruit_CharLCD as LCD
import turtle
import random
from math import sqrt
from gpiozero import Button
from gpiozero import Buzzer


# Raspberry Pi pin configuration:
lcd_rs        = 27  # Note this might need to be changed to 21 for older revision Pi's.
lcd_en        = 22
lcd_d4        = 25
lcd_d5        = 24
lcd_d6        = 23
lcd_d7        = 18
lcd_backlight = 4

# BeagleBone Black configuration:
# lcd_rs        = 'P8_8'
# lcd_en        = 'P8_10'
# lcd_d4        = 'P8_18'
# lcd_d5        = 'P8_16'
# lcd_d6        = 'P8_14'
# lcd_d7        = 'P8_12'
# lcd_backlight = 'P8_7'

# Define LCD column and row size for 16x2 LCD.
lcd_columns = 16
lcd_rows    = 2

# Alternatively specify a 20x4 LCD.
# lcd_columns = 20
# lcd_rows    = 4

# Initialize the LCD using the pins above.
lcd = LCD.Adafruit_CharLCD(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7,
                           lcd_columns, lcd_rows, lcd_backlight)
button=Button(19)
buzzer=Buzzer(12)
outcount=0
incount=0
tom=turtle.Turtle()
tom.speed(1000)
tom.penup()
n=0
while n<1000000:
    r1=random.random()*400-200
    r2=random.random()*400-200
    tom.setpos(r1,r2)
    rtemp=sqrt((r1+200)**2+(r2+200)**2)
    buzzer.on()
    if rtemp<400:
        tom.pencolor('blue')
        tom.dot()
        incount=incount+1
    else:
        tom.pencolor('red')
        tom.dot()
        outcount=outcount+1
    n=n+1
    buzzer.off()
    lcd.clear()
    picalc=4.0*incount/(incount+outcount)
    lcd.message('Pi = ')
    lcd.message(str(picalc))
    lcd.message('\n')
    lcd.message('N = ')
    lcd.message(str(n))
    if button.is_pressed:
        n=0
        lcd.clear()
        tom.reset()
        incount=0
        outcount=0
        tom.penup()
        tom.speed(1000)