A very early alpha of the voting system code

Joypadio.py

import os
import RPi.GPIO as GPIO

class Joypadio:
    'hardware I/O class for joypad voting system'

    #choose your GPIO pins here
    GPIOteamA = 16
    GPIOteamB = 20
    
    def __init__(self):
        GPIO.setmode(GPIO.BCM)
        GPIO.setwarnings(False) 
        GPIO.cleanup()

        GPIO.setup(self.GPIOteamA, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
        GPIO.setup(self.GPIOteamB, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

        self.scoreA = 0
        self.scoreB = 0
                   
    #Record a vote agains the given object
    def registerVote(self,channel):
        if (channel == self.GPIOteamA):
            self.scoreA = self.scoreA +1;
        elif (channel == self.GPIOteamB):
            self.scoreB = self.scoreB + 1;
        else:
            print("unknown channel input detected on GPIO pin:" + channel)

    def resetScores(self):
        self.scoreA = 0
        self.scoreB = 0

Joypadui.py

# UI class
from Tkinter import *
from PIL import Image, ImageTk
import tkFont

class Joypadui:
    'UI controller for joypad voting system'
    
    # count down timer - change this value if you want
    timerSeconds = 300

    # init using the root Tk() instance, and the Joypadio library
    def __init__(self, root, io):
        self.root = root
        self.io = io
        self.timeRemaining = self.timerSeconds
        self.canvas_height = root.winfo_screenheight()-40
        self.canvas_width  = root.winfo_screenwidth()
        self.font_header = tkFont.Font(family="Helvetica", size=100, weight="bold")

    def initGui(self):
        self.c = Canvas(self.root, width=self.canvas_width, height=self.canvas_height)

        # make everything centered, that way we can deal with different resolutions easier insetad of
        # anchoring everything to the top left
        self.imageBG = Image.open( "resources/bg.jpg")
  
        self.photoBG = ImageTk.PhotoImage(self.imageBG)
        self.bg = self.c.create_image(self.canvas_width/2,self.canvas_height/2,image=self.photoBG)

        self.textTeamA = self.c.create_text(self.canvas_width/4, 100, text="Team A", font=self.font_header, fill="white")
        self.textTeamB = self.c.create_text(self.canvas_width/4*3, 100, text="Team B", font=self.font_header, fill="white")
        self.textTeamAscore = self.c.create_text(self.canvas_width/4, 250, text="0", font=self.font_header, fill="white")
        self.textTeamBscore = self.c.create_text(self.canvas_width/4*3, 250, text="0", font=self.font_header, fill="white")

        self.textTimer = self.c.create_text(self.canvas_width/2, self.canvas_height/2, text="COUNTDOWN", font=self.font_header, fill="red")

        self.updateUI()
        self.countdownTimer()

        self.c.pack()

    def countdownTimer(self):
        if (self.timeRemaining <= 0):
            self.timerReached();
        else:
            self.timeRemaining = self.timeRemaining - 1;
            self.root.after(1000,self.countdownTimer);

    def resetCountdownTimer(self):
        self.timeRemaining = self.timerSeconds

    def timerReacher(self):
        'something'
        # dislpay the voting results screen, plus a countdown to the next vote session

    def updateUI(self):
        'update the UI to display scores every 200ms'
        self.c.itemconfig(self.textTeamAscore, text = self.io.scoreA)
        self.c.itemconfig(self.textTeamBscore, text = self.io.scoreB)
        self.c.itemconfig(self.textTimer, text= self.timeRemaining);
        self.root.after(200,self.updateUI)

run.py

from Tkinter import *
import RPi.GPIO as GPIO
from Joypadui import Joypadui
from Joypadio import Joypadio

root = Tk()
joyio = Joypadio()

joypad = Joypadui(root,joyio)
joypad.initGui()

# add callbacks for GPIo events
# bouncetime = number of milliseconds before registering another button push
GPIO.add_event_detect(Joypadio.GPIOteamA, GPIO.RISING, callback=joyio.registerVote, bouncetime=200)
GPIO.add_event_detect(Joypadio.GPIOteamB, GPIO.RISING, callback=joyio.registerVote, bouncetime=200)

root.mainloop()

You'll need a few extra python libraries installed on your Pi to get this code to work:

sudo apt-get install python-tkinter python-imaging python-imaging-tk