need reduce monstrosity of cables and nonsense

[dankamongmen]

it's ugly and unreliable. we need replace what we can with straight jumper wires. we need to solder things into the esp32. ideally we'd combine everything onto a single breadboard by moving the MEGA off of it a bit. finally, we'd enclose everything in a box of some kind, or reduce it to a PCB.

[dankamongmen]

the first thing we need is to solder the four wires down on the esp32. right now, they're all going to pop whenever we pull the power, which we have to do to load new firmware.

[dankamongmen]

i'm rebuilding the board with a much denser floorplan, and i think i can get everything on a single longboard (see picture in #12).

[dankamongmen]

alright, second version of the board is deployed:

• no more sidecar for the esp32; it's on the main breadboard
• taped together RGB wires to make two composite connectors of three wires each
• different color for reservoir than fans
• a few other optimizations

this is much better! but we still absolutely need to solder down the esp32 wires.

[dankamongmen]

i've recently pulled a raspberry pi 3 model b from the AMOLED, replacing it with a raspberry pi 4 model b. this raspberry pi could drive all the sensors plus wifi. that would eliminate the level shifter, the arduino, and the esp32.

[dankamongmen]

iirc, the standard wiringpi library doesn't work on the LIbre Potato, since it's a clone. not sure how necessary that is.

[dankamongmen]

also, there are only 4 hardware pwm pins on the raspberry pi 3b

[dankamongmen]

apparently we can use DMA-based PWM on all pins?

[dankamongmen]

maybe a breadshield would resolve this problem?

[dankamongmen]

i think the HiFive1 Rev B might be able to handle everything:

• it has an embedded esp32 for wifi
• it has 9 PWMs (6 for LED, 3 for PWM)
• 19 interrupt pins

hrmmm it looks like no analog input though =[

[dankamongmen]

i've printed up a brace and we're doing much better!