This way the microcontroller is concerned with the encoder signal only when a new pulse comes. Since the interrupt signal comes from outside the Arduino it is called as external interrupt. Arduino Uno ...

I needed a rotary encoder — I pulled a cheap one out of one of those “49 boards for Arduino” kits you see ... So my goal was simple: I wanted something interrupt driven.

I have no idea how long it takes to operate the look-up tables, and another technique may be needed for machine-driven encoders even if interrupts are implemented ... it did show Arduino-novice me two ...

That’s the idea behind this Arduino-based measuring jig for fabricating ... We’ve seen his garbage can CNC build and encoders from e-waste and tin cans, all of which gave surprisingly good ...