Cdavis

@craig607 yes totally agree, spit balling or back of the envelope sketch 🙂
So great – you can see I’m asking the dumb questions, and if some one has to pick up the bottles every so-often, then can also switch out the power source batterys :).

I see now how the hardware fits in, and found the schematics…[Read more]

@craig607 great to see the stepper functionality and managing it with the GCODEs though I wasn’t clear what the Marlin board is, and how it gets activated. Is the relay the power switch ON, or a pull to ground input.
This probably says how basic my view is, looking at powering, the 4.2V is nice as it maps to a LiPo battery, though LiPo are 4.2V…[Read more]

@craig607 fascinating, thankyou for the brainstorm.
Looking at the stepper motor power draw, seems like managing where that power draw comes from would be part of the design. For one source of steppers that give a range of V and A, there is a lot of choice https://www.adafruit.com/?q=stepper&sort=BestMatch
Happy to brainstorm that part if its useful.

@craig607, thank you for posting this! Would you consider expanding on it as a guest blogger here on EnviroDIY?