CyberPi-linechart1

from cyberpi import *
import random

@event.start
def on_start():
    display.set_brush("blue")
    linechart.set_step(1)
    y = 50
    s = 2
    for i in range(120):
        y = y + random.randint(-s,s)
        if y < 0: y = 0
        linechart.add(y)