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#* The outside ("back") of the flex circuit could be printed with the pushbutton labels and other information, or these could be added in the form of a sticker.
# A connection scheme to attach the coin cell and ESP12F to the flex circuit
#* Z-axix axis electrically conductive adhesive transfer tape (3M type 9703) is one option, though the ESP12F circuit pads may be too small to permit reliable operation and sufficient current flow (approx. 1.5mm2, where the 3M documentation recommends 3.5mm2)
#* The coin cell could be held in place by a paperclip or an ideal clamp on the outside of the flex circuit
#* Alternatives to z-axis tape include wire glue or conductive epoxy, but these limit options for reusing/recycling the device
The total cost of the device will be in the $3-5 range in the quantities needed for FSOSS (approximately 200-250 units).
