After staring at the Union Square clock about 100 times, I decided to replicate it at home, so that I can watch the digits scroll by on my desktop. I named the clock after one of my favorite quotes from the video game Call of Duty: Black Ops, where the protagonist is politely asked for the meaning of a certain set of numbers which are being displayed on Nixie tubes. I feel it fits the piece, as even some native New Yorkers mistakenly believe that the display is the debt clock or something (that’s over in Midtown).
As a review, the clock is read like so: hh:mm:ss:msm:ss:mm:hh, which means that the time is read normally at first (military time), then it goes into milliseconds, then backwards milliseconds, then seconds, minutes and hours until midnight, in that order. Int he example picture, it is 19:30 with 9 seconds and 9 tenths of a second, the middle is usually a blur (set to hundredth of a second), then its 4 hours, 29 minutes, 50 seconds and 9 tenths of a second until midnight.
Fifteen-Digit Nixie Clock - [Link]
I needed a variable slow speed clock to help me debug a design I’m creating with a bunch of CPLDs. Given the current focus on the venerable 555 timer IC, I thought rather than using my usual AVR/PIC solution I’d create something with the handy little timer.
555 based FPGA/CPLD debugging oscillator - [Link]
I made this ChronoBlot a while back, but now that I have a Bus Pirate, I can easily test it out, set the clock, and set the alarm (and write scripts to help with that), so I’ll be updating it soon and wanted to track it on this projects forum.
ChronoBlot DIY remake of the ChronoDot – [Link]
I really like nixie and numitron clocks, but I never worked with them before. So I decided to give it a go. I choose numitrons because of 2 reasons: first of all nixies need a higher voltage than numitrons to work. Nixies need around 170V DC and numitrons only 4,5V so they are safer to work with and don’t need a special powersupply.
Numitron clock & thermometer – [Link]
In this Countdown Timer project, a 555 IC, a counter IC and a transistor switch to activate a relay either ON/OFF(mode selected by a jumper) as soon as the counting period is over. The circuit consists of an oscillator, a ripple counter and two switching transistors.
Simple Count Down timer Project – [Link]
Named ‘El Relojito’ (relojo = watch in spanish), this seemingly simple design is a great project for anyone ready to move past the rank of ‘amateur’. 60 LEDs surround the 7-segment leds telling you the time. A PIC micro controls all the action. The write-up is in spanish, but the schematic/pictures should be enough to guide you. [via]
Simple LED Clock PCB Design - [Link]
This is an Arduino powered 24-hour digital clock that uses the RTC chip DS1307 for timekeeping. DS1307 has a small battery backup so that it keeps the correct time even the rest of the circuit is not powered. The time is displayed on 5×7 LED dot matrix. [via]
Arduino: 24 hours digital clock – [Link]
So I ordered a 1-Wire RTC (real time clock) from the maxim corporation. To be exact its a ds1904. What is really cool about the 1-Wire protocol is it only needs 1 wire to send data on. It is a bit misleading however since it does need a ground as well.
1Wire Real Time Clock With Arduino - [Link]