chronometer

# Turns your micro:bit into a very simple stopwatch
# Copyright 2023, 2024 Roland Richter                [Mu: BBC micro:bit]

import microbit

microbit.display.show(microbit.Image.DIAMOND_SMALL)

# "pass" means "do nothing"; here, do nothing in a loop until A is pressed
while not microbit.button_a.is_pressed():
    pass

# set the start time (in milliseconds)
start_time = microbit.running_time()

while not microbit.button_b.is_pressed():
    # calculate the last three digits of the time elapsed, e.g.
    #   917 ms -> 917
    #  2451 ms -> 451
    #  8056 ms ->  56
    # 10189 ms -> 189
    last_digits = (microbit.running_time() - start_time) % 1000

    if last_digits < 250:
        microbit.display.show(microbit.Image.CLOCK12)
    elif last_digits < 500:
        microbit.display.show(microbit.Image.CLOCK3)
    # TRY to complete this "if-then-else" statement to show a rotating clock hand

# set the stop time (in milliseconds)
stop_time = microbit.running_time()

# show the elapsed time (in milliseconds)
elapsed = stop_time - start_time
microbit.display.scroll(str(elapsed) + " ms")

# TRY to show the elapsed time in seconds, instead of milliseconds.


# ----------------------------------------------------------------------
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.