MRS Cell Cutaway

MRS Cell v0.1 – Engineering Directive Mission Design a parametric synthetic mechanochemical cell where pressure, magnetic fields, fluid flow, and compliant materials perform computation through physical dynamics. Keep computation in the hardware, not software. Physical Architecture Structural Shell Material: PETG Truncated Octahedron Outer edge: 50 mm Wall thickness: 3 mm 5 mm flange, 4 mm thick Six M3 bolt holes O-ring groove: 42 mm ID 2 mm cross-section Compliance Layer Material: TPU 95A Soft valve seat surrounding magnetic sphere Variable permeability through deformation Magnetic Actuator Removable cartridge 12 mm Iron PLA flux guide Copper electromagnet Easily replaceable for coil iteration Fluid System UV-reactive PC coolant Shared pressure medium Converts valve morphology into global pressure dynamics Valve Geometry Neodymium sphere: 10 mm Valve throat: 9.5 mm TPU seat: 9.8 mm Hard stop: 10.2 mm Design passive magnetic funnel geometry that converts magnetic attraction into axial sealing while minimizing lateral impacts and TPU fatigue. Control System Arduino C++ (~100 Hz) Homeostatic envelope controller (not PID) Pressure envelope: Safe: 950–1150 hPa Behavior: Inside envelope: No active control Allow stochastic drift Outside envelope: Adjust magnetic field to restore permeability Sensors: Analog 0–40 kPa fluid pressure transducer AS5600 magnetic encoder via TCA9548A I²C multiplexer Engineering Analysis Evaluate: Coil thermal limits PWM duty-cycle limits Magnetic hysteresis Valve force calibration Heat dissipation PETG and Iron PLA temperature limits Cooling strategies if required Experimental Validation A. Valve Characterization Sweep PWM: 0 → 255 → 0 Measure: Sphere position Pressure Flow Hysteresis Metastable states B. Homeostasis Inject pressure disturbance. Measure: Recovery time Overshoot Settling behavior C. Three-Cell Network Couple three cells through a shared fluid loop. Each cell runs only its own local controller. Observe emergence of: Synchronization Traveling pressure waves Competition Differentiation Symmetry breaking CAD Requirements Generate a fully parametric FreeCAD Python model with: Multi-body assembly STEP export 3MF-ready geometry Modular actuator cartridge Parameterized shell, valve, and seals Required Deliverables Parametric FreeCAD generator script Arduino firmware implementing homeostatic control Thermal and power budget with safe continuous PWM limits Complete BOM including: PETG TPU 95A Iron PLA Copper magnet wire 10 mm neodymium sphere Silicone O-ring M3 heat-set inserts Analog pressure transducer AS5600 encoder TCA9548A I²C multiplexer

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