Side by Side Curing Experiment with VPD

Owly

Owly

Member
I'm planning on testing out about four different methods and want some help deciding what to do with each.

I've been messing around with an Arduino program that calculates vapor pressure deficit for grow room control, and got to thinking.
As a proof of concept I cured a little sample with a humidity sensor in the jar. It worked well, so I want to try it more.

For that one I set the VPD to match normal curing at room temp, about 65% at about 65F.

I'd like to try one at a higher temp and the same VPD. Maybe 110ish, maybe another at 140F?

I'd like some sort of control group.

But I was hoping for ideas from the community. I'm not afraid of trashing some weed for science. This test will be small samples, baby food jars to be exact.

Thanks for your ideas! I hope to try as many as possible.
 
Owly

Owly

Member
a mongo frog said:
Im confused, what does this mean? I may be wrong but doesn't VPD have to do with water around leafs during a growing cycle?
Click to expand...
That's the way it's generally used, but it's just a way of looking at humidity.
It's the difference in the maximum humidity (100% RH) for the temp and the amount of water in the air.
So it's the potential the air has to pick up water. Seems like it would be applicable for curing

But maybe not, I'm just trying shit, I don't claim to know what I'm doing.
 
Owly

Owly

Member
pinner420 said:
Sounds cool what does the code look like and the hardware?
Click to expand...
I guess pics are down, but it's just a DHT22 off an Uno board with a high and low LED.

The program:

#include <Adafruit_Sensor.h>

#include "DHT.h" //you'll need the "library" on your computer for this to work
#define DHTPIN 2 // what digital pin we're connected to
#define DHTTYPE DHT22 // DHT 22
float vpd;
float vpdSetHigh = 10;
float vpdSetLow = 8;
int vpdHighLed = 12; //pin for low humidity light on
int vpdLowLed = 11; //pin for high humidity light on
int readDelay = 2000; //DHT 22 (AM2302) can only take a reading every 2 sec

DHT dht(DHTPIN, DHTTYPE);

void setup() {
Serial.begin(9600); //left in for testing stuff while connected to computer

dht.begin();

pinMode (vpdHighLed, OUTPUT);
pinMode (vpdLowLed, OUTPUT);
}
void loop() {

float h = dht.readHumidity();
int t = dht.readTemperature();

if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");// Check if any reads failed && exit early (to try again).
return;
}

vpd = ((1-h/100)*0.611*exp(17.27*t/(t+237.3))*10);

while (vpd <= vpdSetLow){
digitalWrite (vpdLowLed, HIGH);
delay(readDelay);
h = dht.readHumidity();
t = dht.readTemperature();
vpd = ((1-h/100)*0.611*exp(17.27*t/(t+237.3))*10);
}
while (vpd >= vpdSetHigh){
digitalWrite (vpdHighLed, HIGH);
delay(readDelay);
h = dht.readHumidity();
t = dht.readTemperature();
vpd = ((1-h/100)*0.611*exp(17.27*t/(t+237.3))*10);
}

delay(readDelay);
}
 
Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
sounds like an interesting experiment, but i've always been under the impression that high temps are bad during curing, as they help promote mold and mildew growth, and start breaking down the thc content, and possibly other cannabinoids and terpenes
 
Owly

Owly

Member
Roger A. Shrubber said:
sounds like an interesting experiment, but i've always been under the impression that high temps are bad during curing, as they help promote mold and mildew growth, and start breaking down the thc content, and possibly other cannabinoids and terpenes
Click to expand...
High temps generally make things happen faster, good and bad. I've been reading about corn cob curing at elevated temps which is what made me think this would be worth a try.
 
Owly

Owly

Member
Alright, test bud dried up a day or two before I was planning and I only have two working sensors.


Test jar 1) I'll leave on my ballast. It's on 12/12. It gets pretty warm maybe 110F, it's a no fan digital 600watts running at 400watts. The up and down temp will do something.

Test jar 2) I haven't chosen if I should do it at room temp or try to make a box that holds at something like 140F

control jar) I just open when I feel like I should.
 
Wilderb

Wilderb

Well-Known Member
Owly said:
I've been reading about corn cob curing at elevated temps which is what made me think this would be worth a try.
Click to expand...
Corn cob curing? You mean drying the corn? Not even close to curing bud.
Never heard of cob curing. Not saying it doesn't exist but I could throw football and hit 2 cornfields from my deck and I've never heard of it.
WE
 
Owly

Owly

Member
Also, I guess I should update my level of fail. Hit a glitch in my programming and haven't figured it out yet. These samples are getting a normal cure. I've given up on these as a test but will try again come real harvest time in a few weeks
 
Owly

Owly

Member
Wilderb said:
Ahhh. Okay. Interesting. Not sure of the validity but who knows.
What ever floats your boat. Good Luck.
WE
Click to expand...
Yup, it's not quite a shot in the dark, but it seems like there might be something to it (which I may be totally missing or hitting with this)
 
Wilderb

Wilderb

Well-Known Member
Owly said:
Yup, it's not quite a shot in the dark, but it seems like there might be something to it (which I may be totally missing or hitting with this)
Click to expand...
I learned along time ago that anything is possible. Nothing ventured, nothing gained.
 
Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
when you cure like the Malawi, they call it cobs. its a slow decarbing process. after a real malawi cob cure you can eat the buds and get fucked up
 
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