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[Solved] Minor change, great improvement in regulating humidity in fruiting room


tico
 tico
(@tico)
Trusted Member
Joined: 12 months ago
Posts: 80
Topic starter  

Hi all,

I've been trying to tune the PID that controls the relay for the humidifier in my mushroom fruiting room, and have had some pretty consistent swings in humidity, often not unacceptably bad (+/-5%) but not great. I had a circulation fan in the fruiting room, but after a small increase in the KI constant earlier today, it started centering around my setpoint (90%) finally, and but later this afternoon I made the small change of adding a second oscillating fan at floor level, but pointed somewhat upwards, and despite losing some humidity when I had the door open, it stabilized to a much narrower oscillation.

Screenshot shows the difference a simple $15 fan can do!


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Kyle Gabriel
(@kylegabriel)
Member Admin
Joined: 6 years ago
Posts: 612
 

That's great. An extra fan or two can do wonders with homogenizing humidity in a room or chamber. What's the volume of your chamber/room and what size fans are you using?

Mycodo Developer


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tico
 tico
(@tico)
Trusted Member
Joined: 12 months ago
Posts: 80
Topic starter  

@kylegabriel  Yeah I'm really pleased with how much better it consistently has performed! Last night I bumped the setpoint up to 92% and have still had the same very minor +/- 0.25% swings from my setpoint up to this morning!

The current room specs are 7'x7'x8.5'  (416.5 cu.ft.) and I'm using one of the Crane teardrop humidifiers for now with the dial cranked to max output and switched on/off via relay, I have one ~10" non-oscillating fan near the ceiling and blowing perpendicular to the intake and exhausts are (at opposite ends but both near the ceiling) and then one oscillating 12" or 15" (i'll have to find the package) $15 HomeDepot fan on the floor.

The current sensor location was also only 3' from the humidifier, but after my wiring changes today it will also be spaced a few feet further away, which should also hopefully result in more accurate data input.


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