Re: Threaded inserts in polycarbide or polyurethane enclosures.
Well, I suppose I could run down a general roadmap of this project. There are three interconnected systems. The first is prerequisite for everything. The BLiVIT is a smart lithium ion cell charger/manager that includes full power isolation, a soft on/off switch, and a boost/buck converter to supply either 3.3V or 5V, depending on a jumper selection. The BLiVIT is a 1.2" x 1" board that can have it's power fed from either a wall adapter or USB. The Li+ cell I am using for the prototype is a 950mAH cell that happily is nearly the same dimensions as the BLiVIT. I am also thinking how to adapt the output power, which is available on a 2-terminal screw block or Berg KK header, to supplying an Arduino (Flora?) or RPi. My current thinking is a simple short USB with a pigtail directly to the terminal block. If it is deemed preferable to have more mechanical security than that I could leave it as an exercise for the student to design an Arduino shield that directly mounts the BLiVIT/Battery stack.
The second essential component of the total project is the POQiRX, a receiver/shield/coil unit that directly mounts on the BLiVIT, and provides a wireless power source consistent with the Qi specification of the Wireless Power Consortium. The current thinking is to use a combined coil/shield assembly available from Vishay that is 28mm x 32 mm. The POQiRX is a 1" x 0.8" PCB.
The third essential component is the POQiTX, which is a WPC compliant power transmitter that feeds the POQiRX. Since the WPC's Qi specification requires the transmitter to radiate 5W effective power through the air it is necessarily beefier circuitry than either of the other two components. The POQiTX power comes from either a wall adapter or USB connector. This board is approx. 2" x 1.8". My fervent hope is that this design will be able to achieve EnergyStar certification, since the transmitter is going to be the most power-hungry when in the active transmission modes.