DontShakeMe is an example written in Python that uses microbit accelerometer

dontshakeme.py

# DontShakeMe - Andrea Grandi (2016)
# License: MIT

from microbit import display, Image, accelerometer, sleep

# display an happy face by default
display.show(Image.HAPPY)

# if you shake the device, you make microbit sad
while True:
    if accelerometer.was_gesture('shake'):
        display.show(Image.SAD)
        sleep(2000)
        display.show(Image.HAPPY)