These crawfish can handle very low temperatures, as long as the water stays above freezing. We originally considered shrimp, but they would have required more specialized equipment. Given our limited project budget, we chose a species that can still produce a meaningful amount of protein, yet is tough enough to tolerate temperature swings and only needs modest equipment and resources. In the future would love to add shrimp to the systems.

Absolutely, definitely looking towards other species of plants.

Major Update: Bitcoin Mining Heat-Capture Season 2025 HeatHarvest Greenhouse / Proof-of-Growth: Purple Sweet Potatoes & Crawfish, Vlog 2: Claws & Roots , Move-In, Tune-Up, and Flip to Spring. This Vlog features several big upgrades: Insulated, layered floor: Rubberized PVC, coconut coir, and cement "layered", insulated concrete slab so our precious Bitcoin heat isn’t wicked into the earth. Detailed post on the layered insulated concrete will be added to this thread soon. Crawfish move-in: Two breeding tanks plus the orange stock tub now hold backup breeders and bulk crawfish stock. We also built and assembled a custom vertical hydroponics growing system that ties directly into the stock tub. Biological synergy: Crawfish produce ammonia that microbes convert to nitrite and then nitrate for the plants. As plants take up these nutrients, they scrub the water, creating a cleaner, healthier environment for the crawfish and steady feed for the plants. Temporary automated heating: A modified S19j Pro running a two-hashboard, 120 V modded configuration is keeping the HeatHarvest greenhouse warm, even after a recent drop to 20 F. A simple thermostat brings the #Bitcoin miner online with target of 80 F; so far, temperatures have held between 60–77 F. With winter setting in, the rig hasn’t turned off, so we’re steadily mining Bitcoin and producing HEAT. Purple sweet potatoes moved in: Twelve 10-gallon grow bags filled with organic soil and our cloned purple sweet potatoes grown from seed potatoes over the spring/summer are now in place, for roughly 960 pounds of total grow soil medium in the greenhouse. Flip to “spring”: We switched the greenhouse to 24-hour light, sun by day, and an auto-switch runs the grow lights from dusk till dawn. This extended photoperiod, drives aggressive vegetative growth and pushes the HeatHarvest greenhouse into “spring.” Status: So far, so good. It took two days to dial in all systems. The real challenge was balancing the closed, circular system between the crawfish stock tank and the vertical hydroponics system. We officially switched to spring conditions three days ago, and we’re already seeing spinach seedlings showing strong growth. What’s next for Vlog 3 Command Console: Time to give the console some attention and make the HeatHarvest greenhouse as smart and automated as possible. This will house the automation “brain” and our more permanent heating system. We’re waiting on a unique piece of Bitcoin-mining hardware for the final heating setup, it’s going to be very special. Stay tuned. More spinach starts: Germinate and raise seedlings to 4 inches in a 50/50 coco coir + perlite blend. This keeps roots in a loose medium for easy transfer into the vertical hydroponics system, fed by nutrient-rich water from the crawfish stock tank. Healthy crawfish: Keep parameters dialed so breeding ramps up and egg production begins. Build the smart M.O.E.M. (Mining Operation Environmental Monitor), HeatHarvest Monitor (open source): Custom PCB + hardware + firmware (released free and open source on the HeatHarvest GitHub). It will monitor temperature, humidity, O₂, and CO₂, and send email/notification alerts on anomalies (e.g., sudden temperature drops). It will also log long-term data for this season and future HeatHarvest runs. Also feature a web app that allows us to monitor the HeatHarvest greenhouse 24/7 remotely. Sponsorship stickers: We also need to add our permanent sponsorship stickers. The greenhouse humidity destroyed several sticker rounds, so we’ve ordered permanent vinyl replacements for the sponsor banner. Current plants in the HeatHarvest greenhouse: Purple sweet potatoes, spinach, mint, avocados, and Japanese honeysuckle with more to come as space allows. Countless micro-projects are underway before Vlog 3. Stay tuned, I’ll keep this thread updated until the next Vlog is live. Would like to welcome our latest Sponsor Ungovernable Misfits. Interested in sponsoring? There’s still time DM or email us. Sponsors: Bitsbetrippin: bitsbetrippin.io ... Bitcoin Mining World: bitcoinminingworld.com ... MegaMiner: megaminer.market ... Ungovernable Misfits

GM nostr, stop telling yourself you can’t solo-mine a Bitcoin block. Every block is solved by one single ASIC chip. The only guaranteed way to not grab that solo #bitcoin block, is not plugging in your rig.

Premium secured. testing…

🤔

3d parts can be downloaded from the main project git repo. https://github.com/BeeEvolved/Bitcoin-Mining-Heat-Capture-Season-2025-HeatHarvest-Proof-of-Growth-Purple-Sweet-Potatoes-Crawfish.

W21: E-Waste Conversion, Bitmain S21 Pro Chassis → Gravity-Fed Organic Worm-Casting Miner W21 is true e-waste upcycling. We repurpose the empty Bitmain S21 Pro chassis as a durable, stackable shell for a gravity-fed vermicomposting system. The design is open-source, and every 3D-printable part is in the HeatHarvest GitHub repo The result is simple and powerful: kitchen scraps and crop trimmings go in; microbially rich worm castings come out, and those castings feed our HeatHarvest purple sweet potatoes in the heat-capture greenhouse. Why an e-waste conversion? Obsolete mining hardware is both a problem and an opportunity. The S21 chassis gives you precision metalwork and mounting points that would be costly to fabricate from scratch. Converting that shell into a worm-casting miner keeps material out of landfills and turns an old form factor into a tool for organic #Bitcoin mining heat food production. What worm castings are and why they matter? Worm castings are the end-product of vermicomposting: a stable, humus-rich material loaded with beneficial microbes, plant-available nutrients in gentle concentrations, and a high cation-exchange capacity that buffers fertility. In soil, castings improve structure aggregation, water infiltration and holding, and nutrient cycling at the root interface. They’re forgiving low-salt, low burn risk, and effective in small, regular doses. Castings provide the biological side of fertility: resilient, living nutrition that scales with your grow. The species that makes the magic happen and its life cycle: red wigglers Eisenia fetida E. fetida is a surface-dwelling compost worm adapted to rich organic matter. It thrives in loose, moist, well-aerated bedding and responds quickly to steady conditions. Cocoons typically hatch in 2–3 weeks temperature-dependent; juveniles reach maturity in 6–8 weeks; adults lay cocoons regularly when moisture, temperature, and food are good. Feed a thin, weekly top layer of chopped vegetable scraps, coffee grounds are fine. Avoid fats, oils, meat, and salty foods that sour the w21 Maintain moisture with light misting if dry, and add dry coconut coir if it’s too wet. Worms migrate upward to fresh feed, while finished castings consolidate below by gravity. Design logic: gravity in, gravity out The W21 uses a vertical drop-through stack inside the S21 shell. New feed is always added at the top; as worms move up, the lower material matures and drops into a sealed harvest drawer for easy collection. Gravity is AWESOME 😎 Using castings in the heat-capture greenhouse Purple sweet potatoes respond beautifully to castings, tuber quality depends on even moisture, steady micronutrients, and a cooperative microbiome. Castings help deliver all three. Circular systems and why composting matters The goal is sovereignty through cycles you control. Scraps feed worms; worms make castings; castings feed the next crop; the crop becomes the next scraps. ♻️ Castings reduce dependence on synthetic fertilizers, build soil structure that buffers stress, and equip roots with microbial allies that supply nutrients when plants signal for them. Because the W21 is built from an otherwise obsolete chassis, the loop begins before the biology: first you recycle a device, then you recycle nutrients. That’s sustainability in practice, local inputs, local processing, local food + Bitcoin heat = 😎 W21 proves that an obsolete miner chassis can become a living machine for Bitcoin heat capture, food production and a champion of sustainability. The design is open, the parts are printable, and the process is teachable. Build one. keep it steady, feed it thoughtfully, and put the castings to work where they matter most in your Bitcoin mining heat-capture greenhouse. This project is part of our 2025 Bitcoin Mining Heat-Capture Season—HeatHarvest: Proof of Growth. 2025 HeatHarvest Sponsors: Bitsbetrippin: https://bitsbetrippin.ioBitcoin Bitcoin Mining World: https://bitcoinminingworld.com MegaMiner: https://megaminer.market Ungonverable Misfits

The floor of the HeatHarvest greenhouse is built as a thermal shield so our Bitcoin heat stays in the space instead of being wicked into the ground. We stripped everything out , disassembled the structure, and excavated to about 12 inches. From the ground up, the new stack-up is: -Creek rock gravel for drainage and a stable base -Rubberized sheet membrane thermal barrier -Coco coir + cement insulating layer, thermal buffer -High-strength concrete slab, gently sloped toward a center drain for easy wash-down and water management -Concrete liquid sealer to protect and finish the slab This configuration turns the concrete slab into a true heat capture slab instead of a heat waster. The slab becomes the main thermal mass inside the greenhouse, while the insulated layer and membrane below it slow heat loss into the earth. The result is a tougher, drier, and far more heat-efficient floor, purpose designed and built for the Bitcoin HeatHarvest greenhouse. The images above of the cement and coco-coir “concrete burritos” are sample sections we made to test different mixtures. Wish we could’ve finished it with tile and grout this year, it will definitely be a project for next HeatHarvest season.

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FREE and open-source Bitcoin mining hardware: Don’t throw away or sell your S19j, S19k, or S19 Pro units just yet, developing something tailored for our Bitcoin-mining HeatHarvest greenhouse, semi-waterproof, moisture-resistant, and packed with some intriguing extras. Securing the hashboard with lock mechanisms was a priority, along with a tough and durable 3d printable frame that ties cleanly into other materials after printing. Working in mounts for alternative thermal-management modules, currently prototyping. Beyond the core functions, kept the pleb #Bitcoin miner in mind with this design, many pleb miners have small print area 3D printers, parts are kept within ranges to fit smaller printer beds. This is Prototype 1, the basic concept. Logged a dozen mod notes, now it’s back to CAD and reprints. Stay tuned, this is shaping up to be perfect for solo plebs mining at home and DIY Bitcoin heat capture projects

Want #Bitcoin to actually move the needle forward for humanity? Trade main character vibes for teammate energy. Egos down, collaboration up.

So far looking very good. Definitely going to try it for a couple months then reevaluate.