AirTimer

###a gesture-operated, visual alarm device

Important Variables

int appStateMain

stores the current state ID of the app

• 0 - off - when the app is not initialized
• 1 - standby - app is initialized, but currently inactive.
• 2 - starting - interim state during startup (animation, 1 second)
• 3 - while adjusting minutes and seconds
• 4 - timer running / counting down
• 5 - timer paused / count down on hold
• 6 - timer reached 0 / alarm

timer*

// status of the timer
int timerMinutes = 0;
int timerSeconds = 0;
int timerCurrentFrame = 59;

These variables are used to store the time setting. Once the countdown is launched, timerCurrentFrame is decreased by 1 per frame. Important: None of the above may ever have negative values (set to 60 instead).

animation*

// animation helpers
int animationCounter = 0;
int animationHelper = 0;
LED[] LEDs;

LED[] LEDs - an array, containing 60 instances of the class LED

• this array is instantiated and filled in setup()
• it helps to access / manipulate the simulation of the LED ring

animationCounter is used for the timing of animations. Example: Counts up to 60 frames = one second, value is used for lerp() calculations occasionally.

animationHelper is set to store values that are animated during animation. Example: For blinking LEDs, brightness value is lerped, saved in animationHelper and then applied to all LEDs.

Usage

Key "P"

currently simulates the PUNC gesture. In most cases, hitting "P" will increase appStateMain by 1 to go to the next step of the app.

Key "O"

currently simulates increasing the desired time. Depending in which mode the app currently is (appStateMain), increases minutes or seconds.

Key "L"

currently simulates decreasing the desired time. Depending in which mode the app currently is (appStateMain), decreases minutes or seconds.