OpenGrow is my home grow (two plants in a 60×60 cm tent in my bathroom, legal in Germany) and everything I built to run it, published as it happens: https://opengrow.app/

The controller is a single JavaScript script on a Shelly 0–10 V dimmer. It drives the EC exhaust fan, dims the LED lamp on a weekly PPFD schedule, and switches a dehumidifier. It also sets the bathroom radiator through the FRITZ!Box's thermostat API, because the tent breathes bathroom air. The loop is a PI controller on VPD (vapour pressure deficit), with feed-forward and a check that notices when more exhaust only cools the tent instead of drying it. A second script on the lamp's dimmer is a watchdog.

The site has:

- a live device map (5 s updates)
- a diary with daily climate charts and photo time-lapses
- the controller source with a deploy tool
- a 3D-printable fan humidifier (STL/OpenSCAD, Three.js viewer)
- a changelog of every control change

Full disclosure: I used AI quite a lot to help write the code. The hardware, the testing and all the tuning happened on the real tent, though, and every control change is documented in the changelog, including the ones that didn't work.

Code is MIT, content CC BY 4.0. Happy to answer questions about VPD control, Shelly scripting, or running a grow in a bathroom :)

So I had a tent going a few years ago in our rented home and that garden office has roof issues that the landlord has dragged out fixing so it's moldy and damp AF in there. I'm at a point where I'm desperate to grow my own and a small in the bedroom kinda solution is what I will need.

I'm thinking along the lines of getting something like wooden furniture that I could turn into a grow box. During the summer I got the idea for an outdoor planter for vegtables and herbs and thought it would be smart to get timber and char it so as to prevent bugs and mice etc from trying to climb up.

So this got me thinking for an indoor grow box and using the same idea for the inside of the box. Mold, bugs etc will not touch charred wood same goes for anything microscopic if I recall correctly, please correct me if I'm wrong?

The idea was to either buy a used dresser or something similar or maybe built one and char the inside and brush/sand any loose stuff left and clean it. Then I would staple or pin some foil for light reflection.

For extraction I would maybe use the small Secret Jardin inline extraction fan that has adjustable temp and humidity controllers built in or possibly build my own one that can run at a lower decibel seeing as I will have to keep it in my room.

I already have 2 Noctua PC fans with a controller that I can mount inside for circulation and for the intake I was thinking of a charcoal filter for a kitchen-fan extractor or the charcoal cabin filters for cars ( I think the car filters last longer?) Reason for one on the intake is in case the landlord visits and I can switch of the extractor and throw a large clothe over the unit and put a table lamp on top of it to hide it and make it "blend in".

Do any of these ideas sound good or are they too much etc? I live in Ireland and we have very damp weather all year round and during the winter months the house gets a lot of spiders looking for shelter which was the biggest issue with my tent along with risk of mold.

Hi, im about to make my new space bucket. I will use 2 white buckets some old lightbulbs and pc fans. My question is, how can i filter the air so it doesnt smell for cheap? Becouse a carbon filter is too exxpensive for me. I was looking at carbon pieces of material that you just stick on to the fan will that work?

Hi guys, can anyone could tell me what's going on with this?

This is my first indoor run. So I'm pretty lame about tent and components.

My tent is a 3x3. SE3000 300W.

Those are 4 Gorilla Cookies Auto, and they are on their 30° days.

3 days ago I notice for the first time that the leaves tips, not all, was becaming yellow, some of them brown too. It was the day they start the preflowering fase.

So I stop giving them nutrients.

Untill yesterday evening I didn't notice any worst, but this morning no stop and some big leaves was yellow, other was strange e the new shoot was with yellow tips too.

The soil is Plagron Light Mix. Fabric pots 3 gallons. I'm using Athena Blended as nutrients, but I give them a little bit less then the half of they recomende, cause that chart is for coco or Hydrophonic.

Since the day I found this I'm giving them only water and yesterday I did a little flushing.

Water with nutrins, last was: pH 6.23 - EC 1.35

Only water is: pH 6.2 or some.

Yesterday run-off: pH 7.11 - EC 1.42 after 3 days on only water.

What am I doing wrong?

Let me know please, cause I toght the issue was sealed. But apparently not yet.

First time growing in coco and first time growing in my space bucket. My lst is a little more sloppy than I would have liked.

I'm building a space bucket and removed the plastic diffusers from 5 LED bulbs to get more direct light.

- Bulbs: LEDVANCE Value Classic A 100, model AC70645, 13W each, 220–240V AC, 95mA, 1521 lm.

- Total power: 65W (3 bulbs at 2700K, 2 at 4000K).

- Setup: The exposed LED boards are mounted on the lid, about 5cm above a proposed barrier.

- Barrier: 2mm clear polystyrene (PS, recycling code 6), 50×50cm, flexible, smooth surface.

I want to keep the bulbs without their diffusers and use this sheet to prevent contact with the LEDs. I don't want to buy additional equipment if possible.

How can I make this setup safe? Is the polystyrene suitable for the heat, and can a plastic barrier protect against the electrical risk of exposed LED boards? What would you do with these exact materials?

Hey everyone! 👋

I'm an independent developer and long-time member/fan of the DIY grow community. I wanted to share a project I've been working on for a while: **Cannabis Planner Grow Tracker**.

There are a lot of apps out there, but many require account creation, push your data to the cloud, or show ads. I wanted something **ultra-private, lightweight, and local-first**.

🔒 **Privacy First**

* **No registration/account required**

* **100% Offline & Local:** All logs, data, and photos stay exclusively on your device.

* **Zero ads & zero tracking**

🛠️ **Key Features for DIYers & SpaceBucketers:**

* **Day-by-Day Smart Schedules:** Automated timelines from seedling to curing with automated watering and nutrient dosage calculators based on your pot size.

* **19 Built-in Feeding Schemes:** Full support for popular nutrient lines (General Hydroponics, BioBizz, etc.) plus custom soil & Living Soil setups.

* **Live BLE & ESP32 Sensor Support:** Real-time environment monitoring with interactive climate charts (Temp, RH, Air VPD, Dew Point, Soil Moisture & Soil EC).

* *Tested & confirmed sensors:* Govee (H5075), TempPro (TP357), Xiaomi (Custom Firmware & Flower Care).

* *Coming very soon in the next update:* AC Infinity (B2, N16R8) and live BLE Lux Meter (UT383BT) support with direct PPFD & DLI reading!

* **Visual Grow Logs & PDF Exports:** Track progress with photos and export clean cycle summary reports.

Multilingual support currently includes **EN, DE, ES, PT-BR, CZ** (FR coming soon!).

The app is live on Google Play, and I would **love to get your feedback, suggestions, or feature requests** from the SpaceBuckets community!

🔗 https://play.google.com/store/apps/details?id=com.ivangospocic.cannabisplanner&hl=de&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dcannabis+planner&pcampaignid=APPU_1_C7PQao7ZM9-M7NYPgf7Q2A0

Thanks for taking a look, and happy growing! 🌿

Bucket gardeners of the world! Welcome to the weekly sticky discussion thread. You can use it for general questions, and also for some casual bucket conversation.

Didn't fully grasp the concept of PPFD until it was too late and was blasting the light at full power in seedling stage.

How does my cart look?
I have 2 27G totes for the top and bottom.
I understand I could go cheaper but I am trying to build my Space Bucket with stuff I can get covered by amazons replace coverage. My biggest concerns are whether I got a strong enough light being the one in my cart is 150W and I want to do two plants in the buckets. I know i need a certain type of seed so that I can control when it switches from veg to flower. I also wanted to automate what I can as I am disabled and will be combining an insane number of notifications and reminders combined with whatever automation I can do.

Please I seek mercy as I am new and have very little knowledge on the build I need to do here!
(I have been learning growing for a long time but using and making a space bucket is super new to me.)
(This is my first official grow)

Looking to build a grow. Just looking to harvest a couple of oz at best. Is this a *good enough* grow?

Hi everyone. I finally got my own space to start growing, and I’ve always found space buckets fascinating, so I decided to build one. I bought a 100-liter (approx. 26-gallon) bin to use as a container, but now I have a couple of questions.

• Would this light be enough to reach flowering stage using auto seeds? The idea would be to use only 1 light. If not, is there any similar light I could use? I would like to use easily accessible products as much as possible.
• How much soil should I use?

Hey everyone, we've created a widget that lets you evaluate the light quality in your grow tent or even a full grow room with a fairly high degree of accuracy! Of course, the calculations cannot be 100% exact due to the large number of external factors that are impossible to account for, but it gets you very close.

Here are the settings you can configure:

• Grow space dimensions: Choose from presets or set custom dimensions.
• Light type: Select your LED grow light type from three available options.
• Fixture dimensions: Set the physical dimensions of your LED light.
• PPF: Input the total light output (PPF) of the fixture.
• Bar spacing: If you are using a bar-style fixture, you can set the distance between the LED bars.
• Secondary optics: Set the beam angle (symmetrical or asymmetrical), if applicable.
• Advanced parameters: Configure the maintenance factor (light loss), edge zones, and photoperiod (day length).
• Growth stage modes: Select a quick auxiliary mode for seedlings, vegetative, or flowering stages.

The widget will calculate:

1. Average PPFD across the entire grow area.
2. DLI (Daily Light Integral) for your specified photoperiod.
3. Light uniformity ratio (U₀ min/avg).
4. Shareable PPFD Maps: You can download the generated PPFD maps by clicking "Save PNG". Alternatively, you can copy the URL to bookmark it or share it with a friend. The link automatically saves all your custom parameters, making it easy to store your results or show your setup to a fellow grower.

For a complete and detailed guide on how to use the tool, check out our 3D Grow Light PPFD Simulator Documentation.

Found these on my buds when looking at trichomes to check for ripeness.
They are about 0,15 mm big. I believe that these are spider mites.
I actually just noticed that they are all over the back side of the leaves, which must be the reason why over the 10 days they got all rusty, I thought it's a light or nutrient issue.
Fortunatelly the buds will be fully ripe in about 2 weeks, although considering the infestation, I might harvest early, not sure.

Bucket gardeners of the world! Welcome to the weekly sticky discussion thread. You can use it for general questions, and also for some casual bucket conversation.