Tracks heart rate on y-axis: x-axis is a timer for 60 s. Dims at 7 pm so we can sleep. 24 h format. Plus you can tap on the screen to turn on haptic monitoring of your heart rate even when the screen is off. Tap again to turn off haptics to stop battery use.

v 1.2

-adjusted the y-axis

-made the ball larger for clarity

v 1.3

-added distance and calories

-cleaned up the timer and HR tracking ball code