4 ms·

I'm not a hardware person; could you explain to me why a watch battery wouldn't work in this case. Is it just too low power?

• blhack 13y ago
  It would work! A cr2032 is a super common "coin cell" battery that we use for all kinds of stuff. The "problem" with this is how long it will run for. A watch battery, or a coin cell doesn't have much current capacity.
  • 14113 13y ago
    You can also get specifically low powered attiny chips as well, so a cr2032 would be more than sufficent to power it for a number of months.
    • rgbrenner 13y ago
      If you look at the picture below "Made in Oslo".. you'll see a cr2032 battery.