
Inductive Candle
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"Inductive Candle" is a self-sustaining candle that uses advanced technology to automatically light up when removed from its charging base and extinguish itself when returned. The charging base contains an inductive transmitter, a coil, and a powerful neodymium magnet measuring 12mm in diameter by 3mm thick. The candle assembly features an inductive receiver, a lithium polymer battery charger, a lithium polymer battery, a 6mm diameter by 2mm thick neodymium magnet, a normally open reed switch, and a flickering LED light. When the candle is removed from its base, the neodymium magnet activates the reed switch, illuminating the LED using the LiPo battery as power source. When returned to the charging base, the neodymium magnet in the base alters the magnetic field, deactivating the reed switch and extinguishing the LED while charging the LiPo battery through air coil induction. Air coil induction is less efficient than cable charging, so the design automatically extinguishes the candle when it's returned to its charging base. I purchased the inductive charging system from Adafruit.com, which indicates that the system operates between 9 and 12vdc. However, operating at 12vdc generates excessive heat for most PLA filaments. Using an IR thermometer, I measured temperatures on "Base, Cover.stl" reaching up to 56°C (approximately 133°F) when using a 12vdc power source. Therefore, if you decide to use 12vdc, I recommend printing with Ultimaker CPE+ or equivalent filament that can handle higher temperatures than PLA. As usual, I might have forgotten some files, so please don't hesitate to ask questions if you need clarification on any part of the design. I used Autodesk Fusion 360 and Meshmixer 3.5.474 for design, Cura 4.1 for slicing, and printed with Ultimaker PLA and CPE+ filament using an Ultimaker 2+ Extended and an Ultimaker 3 Extended. One final note: I receive no compensation for using any components or materials in this design.
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