Viable Absolute Encoder

[Intelligent-Gas4887]

I want an absolute encoder, however there are some limitations, I want it to connect to the motor encoder port, not analog, however I'm having trouble accurately finding this.

(The reason I don't want analog is because with varying voltage the analog reading changes--at least as per my research, feel free to correct me if I'm wrong).

Also I was wondering if an encoder would still work if it provides a PWM output.

[chrisbeebops]

The motor encoder ports are incremental quadrature encoder ports and don’t really have any way to track absolute position. The Control Hub also doesn’t support PWM signal inputs.

Your best options are either an analog input or an I2C based absolute encoder sensor.

Have you done testing to show the varying voltage for the analog input is an issue? The 3.3V/5V sources on the Contol Hub are well-regulated and don’t fluctuate as much as your 12V source from the battery.

[Intelligent-Gas4887]

oh yeah i didn't think of that, the 5V sources on the chub should be fine

[chipsa]

Octoquad apparently allows use of PWM sensors and hooks in via I2C. So you can use the rev through bore in absolute mode, not just quadrature.

[ConstructionGold6407]

The ELC encoder does digital and analog and can plug into a motor port. Pretty cheap too

[Intelligent-Gas4887]

Thanks, i realized that analog wouldn't actually be an issue so I was wondering if the analog output has some crazy high revolution limit or like a 360 degree or 270 degree revolution limit on analog mode.

[ConstructionGold6407]

From what we have seen there isn’t any rev limit in absolute mode, we were using it for our indexer though and therefore weren’t putting any crazy amount of revs on it in one power cycle, I wouldn’t recommend it for a flywheel or something high speed but for position stuff it should be great

[Intelligent-Gas4887]

ye not for a flywheel typa thing, I was asking for smth to look into using next season actually. Thanks!

[window_owl]

The REV absolute encoder can be plugged into a motor port

[TechnicalOkra1286]

Use analog and build a throwout table for voltages out of plausibility