When the interrupts for the encoder were attached to the same Arduino which controlls the stepper motors, weird things happened, e.g. at times the motor wouldn't run smoothly or the encoder output ...

display characters from the alphanumeric keypad on the 7-segment display turn on LEDs in the 8x8 matrix when keys are pressed on the 4x4 keypad display some patterns using the 4-color LED bar use four ...

One such module, a generic control panel for 3D printers, has caught the attention of [Bjonnh]. It contains an OLED display, a rotary encoder, and a few other goodies, and he set out to make use ...