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I am looking for a type of digital watch where hours and minutes would show as binary, e.g. with an LED on for a 1 and off for a 0. So 12:30 would show as:

1100:011110

(since 12 = 1*8 + 1*4 + 0*2 + 0, and 30 = 0*32 + 1*16 + 1*8 + 1*4 + 1*2 + 0*1). With lights, it would give:

**  : **** 

It would both be fun and useful training for finding patterns and reading in binary. Ideally it would switch from endian-ness, big or little.

I have found items advertised as "binary digital watch" which have an LED next to an hour or a minute, but I want a watch only in binary.

I imagine it would be feasible with a microcontroller like a microbit or Arduino Nano and addressable LEDs.

Does it already exist, or has anyone built something similar?

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There are a number of binary clock designs on Instructables, as well as a few binary watch models. Due to a sign-on requirement for searches, the above link now goes only to Instructables. Use "binary watch" in the search box for the same results.

binary wrist watch

One great aspect of Instructables is that you can begin with a post you like and modify it to meet your requirements.

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  • Your link sends me to a login page. – Jan Dorniak Feb 20 at 22:16
  • Apparently, in order to commit a search, one must sign in. You can go to www.instructables.com and search for binary watch to get the results from the link. I'll change the link appropriately. – fred_dot_u Feb 20 at 22:41
  • This is exactly what I wanted. From the expression "Binary digital watch" I happened to find a video with that title that explained the operation of the binary digital watch, then found several similar products with that name at online retailers. I like this one the best because it's geeky and stylish. – miguelmorin Feb 21 at 8:58

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