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Diary PCBuds mini-grow
- Thread starter PCBuds
- Start date
Yeah I wouldn't trust that rh meter, but.. also, that is not a good location for it to be put in. Actually, it's possibly the worst place to measure temp and rh. Near ceiling = you will be getting higher temps. Near lights /heat source = you will be getting lower rh.
PCBuds
Well-known member
I should really put a fan up there.
I've got no circulation and my plant last summer got moldy.
I can really feel the heat when I stand on a chair to take pictures.
My furnace doesn't have a fan and all the heat stays on the ceiling.
You want to get you temp/ humidity at canopy height.
PCBuds
Well-known member
That's good because it's quite cool on the window sill, but the RH is pretty low.
The plants don't seem to mind though, and it should help fight off mold.
That's warmer than my rooms. I sit about 68 at all times with 65 %humidity.
Honestly it's hard to belive your humidity is that low. Do you have another one to cross check that they work well and are ok? My experience with similar products (cheap "weather stations") was bad, most of them are over 20-30 rh% off, that's basically worse than guessing your humidity.
Brrrrr.....
PCBuds
Well-known member
I've got almost a dozen of them and they are all cheapies.
SuperBadGrower recommended the round white one saying that they are the most accurate of the cheap hygrometers so I bought 3 of them.
The big "weather station" really is a piece of crap.
I'm going to throw it out.
SuperBadGrower recommended the round white one saying that they are the most accurate of the cheap hygrometers so I bought 3 of them.
The big "weather station" really is a piece of crap.
I'm going to throw it out.
Sampas92
Just newbin
Exploziv, i also have cheap meters..would you point out a product that you know that its good and reliable and not too expensive?
Thanks
I built my own rh readers with DTH21 and SHT21 sensors, which i calibrated and cross checked myself. They are like 2% off full scale. They are cheap, under 2-3 dollars but still, they are more expensive than the whole device you are using. Those cheap ones have shitty sensors and bad calibration. I guess a good brand weather station that costs around 50 euros would have same kind of sensors and much better calibration than the cheap ones. But i like the ability to customize mine so I go the DIY way. Also, I built my whole growroom controller for around the price of an indoor weather station, that's a win too.
Also, 20% rh variation is a lot, as I said, you can guess it better. Also, your nose can feel it better than the 20-30% off those readers offer. I would say your readings are bad, even if it's 50 and not 30%, you would need a bit more than that for optimum growth.
And, especially when the sensor holes are on the back of your reader, don't read near a wall (walls are cold, and if air holes to the sensor are even partially blocked you get bad reading. And since humidity you measure is relative, if wall is cold your rh reading is bad too, because it's related to temperature.
Partial or full shade, canopy level and at least 10 cm from a wall would be a good placement for a temp and rh probe. You also don't want to be near soil or inside canopy, because there you would get higher RH and lower temps.
Last, but not least.. Your plants look good. So keep up the good work!
