Very pretty watch, it makes me drool like all of the other watches out there! As Homer Simpson put it 'Augh... Nixie Watch...' Now I just need to find a paper towel to clean the spit off of my desk.
-joe On Feb 3, 2017 11:03 AM, "Craig Smith" <portreathbe...@hotmail.com> wrote: I thought I would post a few pictures of my finished Nixie watch that I have been working on for a while and some pictures of the build. <https://lh3.googleusercontent.com/-GmmPvJ6OIqQ/WJSzKZRsmkI/AAAAAAAAACs/JFja2TQ-qJkUMGxKIpogsDOUTeyoB2oIwCLcB/s1600/NixieWatch-019.jpg> The finished watch <https://lh3.googleusercontent.com/-eVPGAxYTAvI/WJSzl5xqHoI/AAAAAAAAACw/76eA51UPAB4-r3Iji9ldbvrFY6Tbu7ESQCLcB/s1600/NixieWatch-001.jpg> The breadboard demo setup After testing lots of different shift registers to control the tubes. I needed a shift register capable of doing the job and that would run at 3v. I went for Micrel MIC5841. Although these are not meant to run at 3v, after lots of testing they would work down to 2.1v very reliably, so operating them at 3v should be fine. The microprocessor used is a PIC18F13K22 I ended up using an analogue accelerometer (ADXL335) over the i2c one as it drew a lot less current. To get the 170v required to drive the tubes, I used a DC/DC converter IC (LT1308) and a small transformer 31105R (which I got from David Forbes at Cathode Corner) To keep the time nice and accurately, I went for a real time clock IC. This is a DS3231M. It has built in temperature correction. The total current drawn when sitting there not displaying is only 96uA The watch displays the time in a similar way to most of the other Nice watches out there. You tip it to the viewing position and the hours flash, then the minutes. As I wanted the date to shown also, if you keep the watch in the view position, the date will also flash up, day then month. When the battery gets to 3.5v, the minutes flash twice to show the battery is running low (I copied this idea from David Forbes). When the voltage gets to 3.3v the watch stops displaying. When testing the circuit I did 45 time reads a day and the watch lasted for 18 days until it stopped displaying the time. It then ran for another week until the battery had dropped to 3v. <https://lh3.googleusercontent.com/-QnzBHlM5Jgk/WJSz2xBodZI/AAAAAAAAAC4/g7msM07wYU45kG6TiX2SlcMcI5fPy9N-ACLcB/s1600/NixieWatch-002.jpg> PCB's etched by OSHPark <https://lh3.googleusercontent.com/-QnzBHlM5Jgk/WJSz2xBodZI/AAAAAAAAAC4/g7msM07wYU45kG6TiX2SlcMcI5fPy9N-ACLcB/s1600/NixieWatch-002.jpg> <https://lh3.googleusercontent.com/-xMI68rjkIXM/WJS0HTgG43I/AAAAAAAAAC8/moyTRYhFcF8aezrgcMcHGhckco0oZfNFwCLcB/s1600/NixieWatch-003.jpg> <https://lh3.googleusercontent.com/-xMI68rjkIXM/WJS0HTgG43I/AAAAAAAAAC8/moyTRYhFcF8aezrgcMcHGhckco0oZfNFwCLcB/s1600/NixieWatch-003.jpg> <https://lh3.googleusercontent.com/-6uzVtV5CT80/WJS3KYDfGeI/AAAAAAAAADQ/mBnaJdHq-FscCUaQ3jSMT4GjrI6Sv8_MACLcB/s1600/NixieWatch-004.jpg> <https://lh3.googleusercontent.com/-6uzVtV5CT80/WJS3KYDfGeI/AAAAAAAAADQ/mBnaJdHq-FscCUaQ3jSMT4GjrI6Sv8_MACLcB/s1600/NixieWatch-004.jpg> <https://lh3.googleusercontent.com/-osnB21j6Cws/WJS3R9LXxCI/AAAAAAAAADU/IDE-j3v5t4cuBbdExvLzfToAU9SB3idGACLcB/s1600/NixieWatch-005.jpg> <https://lh3.googleusercontent.com/-osnB21j6Cws/WJS3R9LXxCI/AAAAAAAAADU/IDE-j3v5t4cuBbdExvLzfToAU9SB3idGACLcB/s1600/NixieWatch-005.jpg> PCB assembled. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/ msgid/neonixie-l/722e8395-a6e6-4dbe-837d-a9f95986c03a%40googlegroups.com <https://groups.google.com/d/msgid/neonixie-l/722e8395-a6e6-4dbe-837d-a9f95986c03a%40googlegroups.com?utm_medium=email&utm_source=footer> . For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAE%2BVk6PxTQzHBXSBWzpV5dsgJ6yG9ksrn%2B%3Duw%3DvcvasHno3KJA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
