Interrupts

Like a crying child, some things just need your attention right away.

Outline

• The Fourier Transform
• Hardware low-pass filter for debouncing
• Ultrasonic sensors
• Interrupts
• attachInterrupt(), detachInterrupt(), & digitalPinToInterrupt()
• Function prototypes
• Header files
• Multi-file sketches
• Quadrature encoders

Exercises

1. Utilize interrupts to keep track of encoder steps. Create a separate source file that encapsulates your encoder functionality and expose the current encoder steps with a function that has the following signature: uint32_t encoder_steps(void).