I needed a rotary encoder — I pulled a cheap one out of one of those “49 boards for Arduino” kits you see around. Not the finest encoder in the land, I’m sure, but it should do the job.

Now that your rotary encoder hardware is up and running it’s time to tell your Arduino what to do with the encoder signals. There are the two basic ways to read a microcontroller’s digital input. With ...

The LS7366R IC performs decoding and counting of quadrature ... from the encoder and a count limit of 232. A serial interface (SPI) greatly reduces the required IO wire count as compared to ...