Project you are the ONE. a Wireless powered fiber optic side glow diffused bling
I have this idea of making novelty jewellery for my missus, a wearable electronics of some sort with wireless charging.
At a seeming random event I would have a little girl present her with a nicely decorated box containing the bling I have made, with a message asking her to “follow the rabbit”. Hopefully the intricate design would be tempting; she would put on the jewelry I made without hesitant. A rabbit inspired human would walk pass her and hopefully she would pick up the subtle message of "following the rabbit" per se. While following the rabbit, she will come across a few interesting characters that are staged, and the last person to appear will be yours truly.
Naturally, we would reach out to each other. Me, being the techie would have the inductive charger's transmitter loop well hidden in my palm; the circuitry is hooked up to a cleverly disguised 12v 1A power supply.
It is just a matter of time/distance for the EM fields resonating between the tx loop and the rx loop; her novelty jewelry will light up mysteriously, and the intensity of the light grew greater as we are moved closer! YES!! You are the one! Both of us proclaimed. Well, that’s the perfect time for yours truly to take a knee with a unique ring and what else?? Propose to her!! This definitely work. Trust me, I am an engineer.
Coupling several technologies and digital fabrications technologies: wireless charging (inductive charging), Arduino, ATTiny85, RGB LED, PCB, and fiber optics. i present to you the said piece
Oh waittttttttttttttttttttttttttttttttt…………I don’t have a missus/wife/GF yet.
This instructables assumes the following parts
1x DIY wireless charging kit, acquired from aliexpress
1x RGB LED fading PCB
1x 5mm side glow fiber optic with sufficient length for the applicaition
1x bespoke 3D printed holder as the jewellery
1x 12v 1A DC supply
wireless charging kit. I got one set that is Chinese made at 13USD from aliexpress.
3D printed custom made jewellery to hold the electronics, rx loop, and fiber optic. I have chosen to use a 3D printed bangle. The STL is available here. Print it twice. The two halves are snap fit. It was done in sketchup with the help from xinteng from DCPE yr1.
An apparatus with RGB LED fading PCB of some sort, which consist of a microcontroller such as Arduino or ATTiny85, a RGB LED and a custom PCB or veroboard. A tutorial to program ATTiny85 with Arduino is available and the necessary ATTiny ISP shield can be made too.There are many derivatives floating on the Internet. I have used my own recipe of ATTiny85 with RGB. The step by step guide of “cooking” a PCB of your own is available here.
Step1: Assemble the RGB fading PCB, program the ATtiny 85 and mount it onto the PCB. Fiber optic cable is then inserted into a 5mm heat shrink tube. The contraption is then inserted to the 5mm RGB led. The picture depict the assembled contraption.
Step2: the assembled contraption in the earlier step is then assembled with the 3D printed bangle. The fiber optic cable are not elastic, and should not be bend at sharp angles. It keep slipping out of the 5mm gap designed to hold it, so I have to resort to cable ties to hold them in place.
Step3: Test the contraption with 3V battery to test for functionality
Step4: Assemble the contraption with the RX induction coil and PCB. I have to resort to use some masking tape to keep the wires in place.
This step is the simplest. Connection is akin to wiring a battery.
Step5: Test the contraption with TX loop connected to DC power supply. The power supply is set to 12V, 0.5A.
Step5: final check before turning on the DC supply. After turning on the DC supply, observe the behaviour on the EM fields w.r.t to the tx and rx loop. Note: No wireless transfer if the rx and tx loop are orthogonal to each other. The EM fields just cancel each other off.
check out the video for the bling in action!