ler o sensor do lab

import time
import serial
import matplotlib.pyplot as plt
import matplotlib.animation as animation

interrupted = False

def on_key_press(event):
    global interrupted
    if event.key == 'i':
        interrupted = True


def animate(i, dataList, ser, frequencia):
    ser.write(frequencia)
    arduinoData_string = ser.readline().decode('ascii')

    try:
        arduinoData_float = float(arduinoData_string)
        dataList.append(arduinoData_float)

    except:
        pass

    dataList = dataList[-50:]

    ax.clear()
    ax.plot(dataList)

    ax.set_ylim([0, 1200])
    ax.set_title("Leitura do sensor")
    ax.set_ylabel("ValorLido")


dataList = []

fig = plt.figure()
ax = fig.add_subplot(111)

ser = serial.Serial("COM6", 9600)
time.sleep(2)
freq=input("digite a frequencia(1, 2, 3, 4, 5): ")
if freq == 1:
    intervalo=200
elif valor == 2:
    intervalo=400
elif valor == 3:
    intervalo = 600
elif valor == 4:
    intervalo = 800
else:
    intervalo=1000
while
ani = animation.FuncAnimation(fig, animate(frequencia=freq), frames=100, fargs=(dataList, ser), interval=intervalo)
fig.canvas.mpl_connect('key_press_event', on_key_press)
plt.show()
ser.close()