Devlog 7 Hydro Garden - TANK RING AND THE PI CODE

what i did

• redid the tank lid as a screw on cap and printed the ring it screws into, so no gamma seal
• wrote all the pi code, its 5 files
• pushed everything to the repo

the tank

• the lid plate is a cup now, it screws into a printed ring that snaps over the bucket rim on 12 fingers
• the drain base drops onto 4 hooks on the cap and twists 20 degrees to lock, so the tower is actually held
• all 3 parts built in cadquery, imported into onshape, assembly is 17 parts
• bom went 467 to 454 🎉

the code

• python on the pi, no microcontroller. config.py, control.py, store.py, web.py, dashboard.html
• control loop reads everything once a minute, csv first then mqtt, runs the lights on a schedule and the dosing pumps
• dosing is a state machine. dose, wait for it to mix, check the reading actually moved, fault if it didnt
• wont touch a real pump until the flow rates and ec per ml are measured

whats next

• the pcb
• get it ready to be funded