The fuzz is good! Jars all still lookin' slick so far, appear to be about 1/4 colonized.
Yep, gonna throw it in the oven. I do have some litmus paper and some amendments on hand, I'll be sure to document and share when we get it mixed up.
The avatar's a photo of Syd Barrett and Evelyn Rose (aka Iggy the Eskimo), one of many taken by Mick Rock during a 1968 shoot for The Madcap Laughs. But at the essence of its current employ, it's a nekkid lady and a hippie forming a V with his feet. Same avatar I was using before the site migrated platforms, I think the old version had "Vork21" shooped onto the wall.
Largely superfluous and built for fun out of junk from the tinker pile, this FC features the finest clones of hobbyist tech China has to offer! Using an Arduino Pro-Mini compatable, the Central Mindbrain Center (CMC) controls a thermoelectric cooling (TEC) module (option 8W bulb heater adapter coming soon), an internal circulation fan, and an overpriced ultrasonic nebulizer.
The Central Mindbrain Center (CMC):
Internal pascetti of the Central Mindbrain Center (CMC):
The Central Mindbrain Center (CMC) receives digital T/H data from from a DHT22 sensor via the 1/4" TRS connection. The four pin Molex supplies 12V+ cold/GND hot, 12V+ hot/GND cold, 12V+ internal fan, and common ground. The external heat sink fan (not pictured) is powered by TEC supplies via OR diode gate. The fogger plugs in a relay controlled outlet built into the unit. T/H data and heating/cooling/fogging indicators are conveniently displayed on the LCD.
The basic logic of the system is as follows:
- Temperature checked every second
- The TEC has a duty cycle of 5 mins on 2.5 mins off in cooling mode, full on in heating mode.
- Internal circulation fan runs for 1 min during TEC off cycle.
- 1 degree F hysteresis
- Humidity checked hourly.
- Fogger runs for 5 seconds (time required for mist to traverse the length of the hose), plus 1 second for every 10% the RH is short of set target.
The Central Mindbrain Center (CMC) offers a simple command line interface from which you can set parameters via USB from your favorite terminal emulator.
Thanks, I hate it! Maybe this thing works somewhere, but it certainly was not designed for dry climates. It spews mist on the lowest setting, the humidistat goes no lower than 30%.
So in the closet it went, and we continued using trusty 'ol Cobblepot (like, as a humidifier, for humidifying air in dwellings occupied by humans):
I actually bought this thing over a decade ago and it still works great (though, the fan is starting to rattle a bit), highly recommended. We like it so much I didn't really want to give it back up for mushies, plus it looks so sad what with the tubing duct taped onto the beak like some freaky deaky BDSM shit, but I digress...
In the mutual interest of those with some electronics savvy who wish to make one of these Air-O-Swiss/Boneco units to work for this purpose, a very brief description of a simple modification:
Take it apart. I won't bore you.
Lobotomize that sucker. These cut wires that went to the control board are as follows:
44 - Float switch, is grounded when the reservoir isn't empty.
4 - Nebulizer oscillator/Fan. apply +5V to make fogger go
25,26,27 - Sensors. thermistor, humidistat,
28 - Heater. Apply +5V to turn on inline heating element
That connector on the bottom left there was plugged into the CN10 connector on the board. We don't plug it back into CN10, we stick a jumper in it instead. If you wished to make the mist level analog adjustable, this is where you'd whack your potentiometer.
In short, tie pin 4 to 5V and add a jumper to the wire that plugged into CN10, and she'll fog when you plug it in. But it'll die if you run it empty, we should at least get that float switch incorporated into the works. That little perf bodge board there is just a simple PNP switch, pin 44 controls the flow between pin 4 and 5V.
Whew. I need to go shovel some coal, for this train is out of steam.
Edited by vork21, 14 March 2019 - 05:39 AM.