A hacky Termux bash script that uses the accelerometer to make an alarm that fires when the phone changes orientation.

hackeyMotionWaitVibrate.sh

#!/data/data/com.termux/files/usr/bin/bash

echo "getting wake lock state"
termux-notification-list | jq -r '.[] | select(.id == 1337).content' | grep -qF 'wake lock held' && locked="true" || locked="false"
if [ "$locked" = "false" ]; then
    echo "wake lock not set, setting for duration of script"
    termux-wake-lock
else
    echo "wake lock set, Will not alter wake lock state."
fi

limit=4
echo "put phone to rest within 5 sec"
sleep 5

echo "getting initial values."
old_x=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[0]')
old_y=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[1]')
old_z=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[2]')
echo "values set. Watching for deviation."

while :; do
    x=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[0]')
    y=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[1]')
    z=$(termux-sensor -n1 -s "BMI160 Accelerometer" | jq -r '.[].values[2]')
    (( $(bc -l <<< "x=(${old_x} - ${x}); if ( x < 0) x = -x; x > ${limit}") )) && break
    (( $(bc -l <<< "y=(${old_y} - ${y}); if ( y < 0) y = -y; y > ${limit}") )) && break
    (( $(bc -l <<< "z=(${old_z} - ${z}); if ( z < 0) z = -z; z > ${limit}") )) && break
    sleep 0.5 
done

echo "Limit surpassed. Beginning vibration. Press any key to quit."
while :; do
    termux-vibrate -fd 1000
    read -s -t 1.1 -n 1 && break
done

[ "$locked" = "false" ] && termux-wake-unlock && echo "wake lock disabled"