Inductive Candle

thingiverse

https://www.youtube.com/watch?v=RTVE4Ck8ZXA "Inductive Candle" is a cable-free charger that charges inductively, just like a smartphone or watch. When removed from the charging base, it automatically lights up and when returned to the base, it instantly extinguishes. The base contains an inductive transmitter and coil as well as a 12mm diameter by 3mm thick neodymium magnet. The candle assembly includes an inductive receiver and coil, 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. When the candle is removed from the base, the neodymium magnet activates the reed switch and lights up the LED. When returned to the base, the neodymium magnet in the base alters the magnetic field of the neodymium magnet in the candle, deactivating the reed switch and extinguishing the LED. The charging system uses air coil induction which is less efficient than cable charging, causing the candle to extinguish when returned to the base. I purchased the inductive charging system from Adafruit, who indicates it will operate on 9 to 12vdc. When using a 12vdc power source, the inductive charging system generates excessive heat that may damage most PLA filaments. Using an IR thermometer, I measured 56° C (approximately 133° F) on "Base, Cover.stl" when using a 12vdc power source. If you decide to use a 12vdc power source, I recommend printing "Base, Cover.stl", "Base.stl", and "Lamp, Base Interface.stl" using Ultimaker CPE+ or equivalent filament with a higher temperature rating than PLA. Designed using Autodesk Fusion 360 and Meshmixer 3.5.474, sliced with Cura 4.1 and printed on an Ultimaker 2+ Extended and an Ultimaker 3 Extended using Ultimaker PLA and CPE+ filament.