Effectively, this hack has us tickled pink. We love the concept of shopping for some actually low cost piece of know-how and doing one thing superb with it, and this can be a textbook instance of that. [davedarko] discovered the cutest little calculator watch on Ali Specific and is working on making a new PCB for it. The plan is to make use of an ARM processor and Arduino and add a couple of extras like 24-hour mode and a pink (or doubtlessly RGB) backlight. The brand new mind can be an ATSAML22G18A, which has an on-board LCD controller and precisely one I/O pin to spare with out charlieplexing the buttons.
Considered one of [davedarko]’s main targets is to maintain the LCD and work out learn how to speak to it. The primary order of enterprise was reverse engineering the watch’s LCD controller by sussing out the secrets and techniques from beneath the black blob of epoxy. This was an eye-opening expertise as [davedarko] had by no means labored instantly with LCDs earlier than. An odd studying made him bust out the oscilloscope. Long-ish and informative story short, [davedarko] came upon that it makes use of a bias of 1/2 for producing the wave essential to multiplex the segments and preserve the sign alternating. That is undoubtedly one to observe!
We love timepieces round right here and have seen every kind of hacks, particularly on Casio watches. Need darkish mode? Done. Allow the hidden countdown timer? We’ve got that, too. And have you ever ever puzzled just how water-resistant the F91W is?