#Description I needed a device to be plugged into a USB port only when I wanted it to be, but I could not gain access to it or the USB port physically, I could only gain general proximity to it.

#Board Manufacturing OSHPark, https://oshpark.com/, can be used to fabricate the board. Simply upload the "BT USB All SMD.brd" and select how many you would like to have built. OSHPak takes about 2 to 3 weeks to fabricate the board. You will have to purchase 3 at a time. When I last ordered the board it was $9.95 for 3.

A Stencil to mask solder paste can be create by uploading the "BT USB All SMD.brd" to OSHStencils, https://www.oshstencils.com/.

#Components

• RF22301, these cost about $20
• USB In
• USB Out
• EE2-3NUX I purchased mine from eBay for about $0.50 each.
• AMS1117 voltage regulator, cost about $1
• Pin headers for UART I had some laying around

As for the smd components I picked up some sample books of capacitors, transistors, resistors, diodes and the such with a verity of components from eBay. So for me these pieces were less than a penny each.

Once you solder the RF22301 on to a board its there. I have not been able to remove one from an old board.

#Operation I used nRF Connect, that I downloaded from the Google Play to connect and trigger the switch.