Zumi goes off after commands

[Timmytomate]

So im working on a study project with my Zumi.
First I need to create a own line Follower.

I tried to get used to the IR-Sensors in small steps
but this code doesnt work.

from zumi.zumi import Zumi
from zumi.util.screen import Screen
import time

zumi = Zumi()
screen = Screen()

zumi.reset_drive()
for i in range(0, 100):
zumi.forward_step(20,0)
ir_readings = zumi.get_all_IR_data()
screen.draw_text(str(ir_readings[3]))

zumi.stop()

If i run the code zumi is driving for a bit then making quick turns in the same spot left and right and
shuts off comletly.

[robolink_leila]

@timmytomate We recommend not using the screen draw functions in your for loop in conjunction with the forward_step(). Any of the screen drawing functions take around 300 ms, which will delay the forward step. Let us know if this helps!