Class Notes: 10 October, 2019

Input classification, serial communication, interrupts

Types of Input

monophonic + skill: wind instruments, percussion

polyphonic + tech: keyboards, pianos, organs, strings
anthropomorphic: respond to human condition, heart rate, blood pressure, galvanic skin, breath rate, pulse rate, visual interpretation of secondary movements: eye twitch, touching your face, blinking

Golan Levin “Opto-Isolator

Serial Communication

SPI/I2C and complex communications protocols
How we get complex data from sensors – a lot of this is hidden in libraries
Unique IDs
Simple controls for complex output: neopixel
SparkFun’s version: Qwiic


Show examples of interrupt code in the environment
switches on mobiles
remote controls for the projectors
complex interrupt systems in video game controllers
rotary encoder (we’ll do a demo later in the semester)
for now, we only use digital inputs for interrupts

Code samples, show how an interrupt can be used to toggle a state by one increment compared to holding down a switch and falling through a number of states.
Note that holding down the switch means the interrupt service routine (ISR) only functions once
Compare to using delay() to sample data every so many units of time.

Use an interrupt to stop a task that takes a long time, say a long for() or while() loop, by adjusting the terminating conditions

Question: What if you were playing mp3 files or video, how would you use interrupts as part of the interface?

zip file with some example interrupts

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