Update

So, here is the code. It’s really simple gadget. The whole setup took me less than a hour for building and coding.

I got the rotary dialer from a local auction site, like Ebay. My first idea was to include everything inside it’s box and leave only the USB cable outside but it was encapsulated and I didn’t have any success for opening it. Originally, the cable had 5 pin DIN connector but only three pins were connected ( White, Brown and Green):

• Green: Ground ⏚
• Brown: Impulse pin. It’s used for counting the impulses. Tje pin outputs 1 on equal intervals.
• White: It’s always UP if the encoder is rotating. I didn’t use this one because the millis() is enough counting the time. It may overflow after some time, but I’m thinking about this in the time of writing this post :)

The board that I used it OLIMEXINO-85-ASM. I got a bunch unsoldered some time ago. It’s clone of the Digispark board with ATtiny85 controller. A really cheap board with software implementation of USB :)) DigiKeyboard.h.

The Brown pin is connected to Pin 2 of the board, as it’s shown in Instructables.

TODO: Removing the USB-B port and wiring USB-A cable directly to the PCB; Possible case for the board.

Update2: It’s even funnier using it with a mobile phone. Works perfect with USB-C to A converter.

Update2: Similar project from 2015

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