ev3dev with Python and the Mindstorm robot.

ev3dev-elliot.py

#! /usr/bin/env python3

from ev3dev2.led import Leds
from ev3dev2.sound import Sound
from ev3dev2.motor import OUTPUT_B, OUTPUT_C, SpeedPercent, MoveTank
from ev3dev2.sensor.lego import InfraredSensor, TouchSensor

sound = Sound()
leds = Leds()
ts = TouchSensor()
ir = InfraredSensor()
tank_drive = MoveTank(OUTPUT_B, OUTPUT_C)

leds.set_color("LEFT", "GREEN")
leds.set_color("RIGHT", "GREEN")

sound.speak("Hello Elliot ! Attrape moi !")
sound.speak("Trois, deux, un. Go !")

while not ts.wait_for_pressed(1):

    if ir.proximity < 55:
        # 22% should be approximately 16cm: obstacle detected !
        # change color of the leds then turn...
        leds.set_color("LEFT", "RED")
        leds.set_color("RIGHT", "RED")
        tank_drive.on_for_seconds(SpeedPercent(60), SpeedPercent(30), 4)
    else:
        leds.set_color("LEFT", "GREEN")
        leds.set_color("RIGHT", "GREEN")
        # drive in a turn for 2 rotations of the outer motor
        # the first two parameters can be unit classes or percentages.
        tank_drive.on_for_rotations(SpeedPercent(90), SpeedPercent(90), 3)

sound.speak("Bye-bye !")