The idea of the slouch detector is simple. If the current angle sensed by the Circuit Playground (current_angle) exceeds a preset value (SLOUCH_ANGLE), then we are slouching and should sound an alarm. Here's the code.
# Circuit Playground Slouch Detector v1
#
# Compute current angle using accelerometer and compare
# to preset slouch angle. Sound alarm if slouching.
#
# Author: Carter Nelson
# MIT License (https://opensource.org/licenses/MIT)
import time
import math
from adafruit_circuitplayground.express import cpx
SLOUCH_ANGLE = 10.0
SLOUCH_TIME = 3
GRAVITY = 9.80665
# Loop forever
while True:
# Compute current angle
current_angle = math.asin(-cpx.acceleration[2] / GRAVITY)
current_angle = math.degrees(current_angle)
# Check if slouching
if current_angle > SLOUCH_ANGLE:
cpx.play_tone(800, 0.5)
