uxcell 360 Degree Rotary Encoder Code Switch Digital Potentiometer EC11 EC12 EC11 7 Pins 15mm D-Shaft 5Pcs a19012600ux0623

The encoders work fine. There are 5 connection pins and two mounting pins. Two of the five come out one side. They are normally open , push-to-connect switch contacts. Looking from the shaft side, the left of the other three is the A quadrature output, the center is ground or common, the right is the B quadrature output. At the detent both A & B are off. For CW rotation, first A turns on, then B turns on, then A turns off, then B turns off and you are at the next detent. (reverse is true for CCW rotation) A and B switching appears to be mechanical.

These are ok for the price. Definitely not a precision part. They are a bit glitchy even at a slow turn rate. Will occasionally encode opposite turn direction. For most applications I don't see this as a big issue. But if you need accurate, deterministic counts and direction you should look to an optical unit.

These come in a bag with nuts and washers. As shown in the picture, with shaft facing you, the wires from right to left are A, common, and B. Search for "minimalistic rotary encoder with gpiozero" and you should find a posting on the Raspberry Pi forums for using this or a similar encoder. They work as advertised and using the rotary encoder script with interrupt triggering you can get reliable tracking of motion. I'm currently using these for a filament movement detector to be used with Octoprint. Good value.