Sensor-Watch

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How to use:

~Important note: LONG PRESS MODE to move to next watch face~

Flow:

Enter first number -> Select operator -> Enter second number -> View Results

How to read the display:

• "CA" is displayed at the top to tell you that you're in the CAlculator
• The top-right digit (1, 2, or 3) lets you know whether you're entering the
  first number (1), entering the second number (2), or viewing the results (3).
• To the right of the top-right digit will show the number's sign. If the
  number is negative, a "-" will be displayed, otherwise it is empty.
• The 4 large digits to the left are whole numbers and the 2 smaller digits
  on the right are the tenths and hundredths decimal places.

Entering the first number:

• Press ALARM to increment the selected (blinking) digit
• Press LIGHT to move to the next placeholder
• LONG PRESS the LIGHT button to toggle the number's sign to make it
  negative
• LONG PRESS the ALARM button to reset the number to 0
• Press MODE to proceed to selecting the operator

Selecting the operator:

• Press the LIGHT button to cycle through available operators. They are:
  + Add
  - Subtract
  * Multiply
  / Divide
  sqrtf() Square root
  powf() Power (exponent calculation)
• Press MODE or ALARM to proceed to entering the second number

Entering the second number:

• Everything is the same as setting the first number except that pressing
  MODE here will proceed to viewing the results

Viewing the results:

• Pressing MODE will start a new calculation with the result as the first
  number. (LONG PRESS ALARM to reset the value to 0)

Errors:

• An error will be triggered if the result is not able to be displayed, that
  is, if the value is greater than 9,999.99 or less than -9,999.99.
• An error will also be triggered if an impossible operation is selected,
  for instance trying to divide by 0 or get the square root of a negative
  number.
• Exit error mode and start over with any button press.