Let's add the flip detect logic from the previous section to the less basic timer code to make a basic hourglass.
Here's the code:
# Circuit Playground Express Basic Hourglass
#
# Author: Carter Nelson
# MIT License (https://opensource.org/licenses/MIT)
import time
from adafruit_circuitplayground.express import cpx
cpx.pixels.brightness = 0.2 # make less bright!
while True:
# Turn ON all the NeoPixels
cpx.pixels.fill((255, 255, 255))
# Compute DT
DT = 5 / 10
# Turn OFF the NeoPixels one at a time, waiting DT each time
for p in range(10):
time.sleep(DT)
cpx.pixels[p] = (0, 0, 0)
# Wait for Circuit Playground to be flipped over (face down)
while cpx.acceleration[2] > 0:
pass # do nothing
# A little debounce
time.sleep(0.5)
# Wait for Circuit Playground to be flipped back over (face up)
while cpx.acceleration[2] < 0:
pass # do nothing
