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A comment on ZSWatch – The Open Source Zephyr Based Smartwatch. Parent comment

Re:ZSWatch – The Open Source Zephyr Based Smartwatch by bloggie on Saturday January 14, 2023 @10:53PM (#34386578)
nrf52 - $7 Display - $5 Accel - $3 Pulse ox - $12 Haptic driver - $1 Haptic motor - $1 spi flash - $2 Battery charger - $5 Battery LVC - $2 Battery - $3 Buttons - $3 Passives and such - $10 PCB - $25 Total - $79

Prices from octopart and some quick guessing, shipping not included. PCB would be the first to come down in price with even a small quantity, $25 is probably an underestimation with qty=1. Passives and friends can also go up quickly depending on design. There is also an SMT antenna present that could cost a few bucks.

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Re:ZSWatch – The Open Source Zephyr Based Smartwatch by _Microft on Saturday January 14, 2023 @11:14PM (#34386660)
JLCPCB should still have special offers for 4-layer PCBs up to 50mm tall and wide. It might be that you can get five boards made for less than 10€/$. I’ll check later.

Edit: yes, $2 for five pieces of 6-layer, 1.2mm thickness PCBs with ENIG surface finish. Unbelievable, isn’t it? 4-layer, 0.8mm, are possible for a few dollars more if thickness matters a lot (only leadfree HASL, though).

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Re:ZSWatch – The Open Source Zephyr Based Smartwatch by Jakkra on Sunday January 15, 2023 @05:21AM (#34388325)
Creator here, you are not far off. I should share bom with prices, will do that on github.
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