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I did not know there existed 12mm vandal-proof switches. I thought the standards sizes were 16mm and 20mm, not 12 and 16. I have the 16mm and it looks fine for a 2.5" wide case like the S4 mini, but 12mm would probably look tiny on something like 4" or 6" size cases.Building your own LED ring circuit looks very daunting. Here I can barely think about doing much beyond a custom Digispark board with integrated I2C components.
I did not know there existed 12mm vandal-proof switches. I thought the standards sizes were 16mm and 20mm, not 12 and 16. I have the 16mm and it looks fine for a 2.5" wide case like the S4 mini, but 12mm would probably look tiny on something like 4" or 6" size cases.
Building your own LED ring circuit looks very daunting. Here I can barely think about doing much beyond a custom Digispark board with integrated I2C components.