Leather Clutch with Inductive Charging
I collaborated with an artisanal leather designer to create a series of "smart" accessories that would incorporate wireless inductive charging for cell phones. My role involved designing a circuit that would be able to discreetly fit into a leather clutch while providing enough power to be able to fully charge a phone. These leather accessories would be featured in Milan Design Week.
In order to design the circuit, we first needed to determine the various use cases of the clutch and the capacity of the battery needed to charge the phone.
The electronics within the clutch needed to:
- Charge a lithium ion battery
- Use the lithium ion battery to fully charge a phone through wireless inductive charging
- Show how "full" the battery is
- Add minimal bulk to the clutch
Given the above stipulations, we chose to design a custom battery with a manufacturer based in Shenzhen. The battery would be less than 2mm in thickness in order to add minimal bulk to the circuit. It's dimensions would be 100mm by 200mm in order to ensure that it had enough capacity to charge the phone.
The above image shows an initial design of the circuit. The inductive charging pad is connected to a Gemma M0, small microcontroller that is primarily used in designing interactive wearables. The Gemma M0 is connected to a three NeoPixel LED's that show how "full" the battery is. If it is full, then all three light up, if it has some power left, two light up and if it needs to be charged, then just one lights up.
This image shows the state of the latest prototype with the proximate locations of each item and the customized lipo battery. There is a micro USB for charging at the left edge of the bag. The LEDs will go along the straps.
The leather cutout and the circuit will be taken to artisanal crafters in Spain who will then sew the various components of the circuit into the leather using conductive thread. The circuit will then be incorporated into a variety of designs that will be showcased at Milan Design Week.