Monitor Tiempo Real

import random
import pygame
import sys
from pygame.locals import *

WIDTH = 400
HEIGHT = 100 #se recomienda que la altura sea el valor máximo de las lecturas de arduino
FPS = 30

#Colors
BLACK = (0, 0, 0)
GREEN = (0, 255, 0)

#Initialize pygame and create window
pygame.init()
pygame.mixer.init()
screen = pygame.display.set_mode((WIDTH,HEIGHT))
pygame.display.set_caption('Monitor')
clock = pygame.time.Clock()

#T debe ser un numero entero mayor o igual a 1, preferiblemente que sea divisor de WIDTH
T = 4
#mientras T sea mas grande, mayor será la separación horizontal de la gráfica

data = [HEIGHT]
#Game loop
running = True
while running:
    #keep loop running at the right speed
    clock.tick(FPS)
    #Events
    for event in pygame.event.get():
        #check for closing window
        if event.type == QUIT:
            running = False
    #Datos generados aleatoriamente con randint, aqui deberian ir tus lecturas de arduino
    read = random.randint(1, 100)
    #Update
    data = (data + [HEIGHT - read])[-WIDTH//T: ]
    #Draw
    screen.fill(BLACK)
    x = 0
    for i in range(len(data) - 1):
        pygame.draw.line(screen, GREEN, (x, data[i]), (x+T, data[i + 1]))
        x += T
    #Flip after drawing
    pygame.display.flip()

pygame.quit()
sys.exit()