There has been a few posts scattered in various threads with pics and descriptions of people's clock projects, so I thought I would start a thread where they could all be collated together. To make comparison easier it would be good if the following basic information was given, as well as whatever else you would like to say to show off your project Your inspiration to make the clock - Type of display - How do you set the time - Microcontroller used - Programming language used - RTC clock chip (if used) - Any other features or information - Your project doesn't HAVE to use a VFD/Nixie/etc, if you have a cool design using a LCD or LED display we would love to see it. So, I'll start - Your inspiration to make the clock - After copying @rt's work with the LCD Add-on for the Webserver in a Box and seeing Technic's posts in that thread I decided to give VFD displays a go and see if I could make one work. Type of display - Futaba 11-ST-26A (Jaycar ZD-1880) How do you set the time - A signal is sent to the serial port of the microcontroller with a "T" followed by the time in unix time_t format. The RTC is then set to this time. Microcontroller used - ATMEGA328P-PU Programming language used - C RTC clock chip (if used) - DS1307 Any other features or information - The DS1307 sucks. Your inspiration to make the clock - I came across this display when looking through the RS catalogue and decided to get a couple to play around with - http://australia.rs-online.com/web/p/vfd-vacuum-fluorescent-displays/6659803/ Type of display - Futaba M12BY02AA How do you set the time - Skylab SKM53 GPS module Microcontroller used - ATMEGA328P-PU Programming language used - C RTC clock chip (if used) - DS3232 Any other features or information - Upon power up the clock runs off the RTC until a GPS signal is found. Once a GPS fix is made the RTC is resynced to the GPS every hour. I haven't quite got the fall over of defaulting back to the RTC upon a loss of GPS quite right yet, but working on it. The amber LED indicates that the time is being given from the RTC, the green LED indicates that the time is from the GPS. The DS3232 has an internal temperature sensor so I used that the show the temp as well. Your inspiration to make the clock - This is meant to be a MKII of the unit above, and I had a Arduino Etherten from Freetronics lying around so I thought I could make a NTP clock, that could also use GPS. Type of display - Futaba M12BY02AA How do you set the time - NTP, and GPS Microcontroller used -ATMEGA328P RTC clock chip (if used) -DS3232 Any other features or information -To date, dismal failure. The clock will sync with either NTP or GPS, but will not switch between the two when one becomes unavailable. Still working on it. Your inspiration to make the clock - I came across this display pretty cheaply, so wanted to make a use for it. Type of display - Noritake itron CU20025ECPB-W1J How do you set the time - Skylab SKM53 GPS Microcontroller used - ATMEGA328P on a Arduino Nano board RTC clock chip (if used) - DS1037 Any other features or information - Housed in the same box as a Raspberry Pi, so I will eventually use the display to show messages from the Pi as well as the Arduino. The clock has a Freetronics temperature / humidity sensor so those values are displayed. The 'G' to the right means a GPS fix, and the '10' means 10 satellites. And the future projects - man this stuff is addictive, does this rash go away eventually?