Motion Sensor for Halloween Animatronics – HC-SR501 PIR + PC817 Optocoupler Enclosure #3DThursday #3DPrinting
Shared by tupsyvejle on MakerWorld : An enclosure for a DIY motion-trigger module aimed at Halloween animatronics.
Executive Summary
Shared by tupsyvejle on MakerWorld : An enclosure for a DIY motion-trigger module aimed at Halloween animatronics. BOM: HC-SR501 PIR motion sensor, Sharp PC817 optocoupler, 9V battery clip (Type T), KCD1 square 2-pin on/off rocker switch, 100Ω resistor, 1× 9V battery. PLA or PETG body (TPU adjusting cap), 20-30% infill, no supports. Two print files, both 0.2mm layer, 6 walls, 25% infill, ~1.4h each.
Open Silicon & Gate-Level Hardware Inspection
From a silicon and hardware engineering viewpoint: - **Interface Neutrality:** Mitigates dependency on proprietary BSPs, empowering open toolchains to address hardware directly. - **Supply Chain Verification:** Schematics and open pinouts allow deterministic audits against silicon errata. - **Lifecycle Decoupling:** Decouples physical hardware utility from commercial vendor end-of-life obsolescence.
Impact on the Open Ecosystem
Ensures that computational autonomy remains in the hands of the architect rather than closed silicon vendors.