Recent content by hjbct

A small aquarium pump (air bubbler pump) on a timer will work. My chamber has similar sized holes and works fine - just stick it on a timer. You can estimate how long it takes to replace the volume of air in the fridge and decide how often you want to do that. Having said that, from what i...

Like you, I use a seed heating pad. I ended up with two which is fine for my small fridge. Personally, I like the idea of using low wattage heat, rather than blasting with higher wattage - maybe use more pads? With a higher wattage heater, I would imagine you will see bigger temperature...

I'd be interested to hear how you get on with the lag and overshoot (hysteresis?) with you code - i'm looking for a better algorithm.

I may look at that sensor - I see Adafruit has Pi library for it.  I think my DHT22 has been unreliable for humidity - I bought a second but never got around to replacing it.   You should be able to change the python code to use that sensor pretty easily. BTW, there are better algorithms for...

I've posted the code on Github. I'm afraid it is not very well documented but happy to help.  I have not put up a wiring diagram, so this is certainly not a recipe for how to build the system, but may be a jump start for someone. I don't know how to put up the google sheets on Github, but the...

sure - let me look at getting some stuff up on github.

Fun project.  I've built a chamber controlled by Raspberry Pi - works well.  Python code on the Pi and Google Sheets as the GUI. Checkout this earlier post! http://www.smokingmeatforums.com/t/252528/porkpi-latest-batch

I have not found fluctuation a problem as long as average over 1 hour is good.  I'm seeing +-15% on RH with my setup.  Temp seems easier to keep tight, but still +-5 degrees.  My averages are where i want the target RH and Temp to be.

Nice!  Following this with interest,  I wish my fridge was bigger!

Here's the parameters page.  This allows me to manage hysteresis.  Circ fan is inside the fridge.  Air pump is aquarium pump which injects air. This is the drying schedule - allows a daily change in Temp and RH.

LOL - yes, I may have geeked out a bit on this one! The R Pi measures temp and RH and controls fridge (cooling dehumidifies), heat (2x 40 watt seed pads), circulation fans, a USB humidifier, an air injection pump (fresh air) and 4 load cells to monitor weight loss.  It reads control parameters...

My Raspberry Pi managed curing chamber is working a treat now. Just loaded my latest batch of experiments: From L to R: 1. Lonzino (plus a small one hiding behind) 2. Picnic Procuitto 3. Goat Leg Violin 4. Lonzo All simple cure : salt, pepper (lots of), Cure #2.  I'm trying Texel DCM for...

Hi, I have not yet posted a BOM - i need to write it up.  Essentially, I have DH11 reading temp and humidity using the Adafruit_DHT python library.  The controls are via a set of relays, connected to GPIO on the pi.  I'm controlling heating, cooling, dehumidifying, humidifying and circulation...

Hi - just finished prototyping my new curing chamber controlled by Raspberry Pi and using Google Sheets as GUI.  I plan on a full build writeup soon. Question - the humidity fluctuates by around 15% but the average is still close to my desired setpoint.  Is this an issue? The red line in the...