2026-06-27 (Sa) SubdermalDuino Circuit etching

I etched the board in a small vat of ferric acid. I used a small acrylic case intended for collectible cards because it latched and was a little larger than the board. I swirled the liquid for approximately ten minutes until I could see all the unwanted copper was gone. I had to fully remove the copper from the bottom because I accidentally bought a double-sided board. Afterward, the acid was spent and disposed of safely. Half of the board had tape on top and bottom to protect it and not waste acid, which I peeled off while cleaning the etched board. I drilled holes for the components, but I realized that since I will be surface-mounting the microcontroller with a hot plate, I should have done all the components as SMDs. I would not have had to etch the back or drill if I went that route. Some of the traces were so thin that they broke, but I can repair them with wire scraps.

Needs work, but it is workable

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12

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2026-06-25