Honestly, I think the hacking required to add buttons for hours and minutes to the Rothko clock is messy. But if  you want an easy, quick and intuitive way to set the time, there is no alternative for buttons; remote control (IR, XBee, BT) would require extra devices, GPS or NTP would need settings. Since the Nixie shield board is already overcrowded, the logical place for the buttons would be on wsduino. And this is the main reason I had to redesign it.
I opted for two right-angle tactile switches placed on the right side of the board, above and below the XBee module. These switches, connected to A0 and A1, are intended mostly for clock functionality, optional for other applications. They could also be replaced by wired external (panel-mounted, not on-board) buttons, when an enclosure is used.

This is how the new wsduino board looks.



Other improvements are:

• moved the 3V3 regulator for better heat dissipation (it was on the opposite side of 7805);
• moved the electrolytic capacitors around, to allow for easier removal of the processor from the socket;
• moved the 1Hz output to a pin between the banks of analog and power pins;
• removed the SDA and SCL from the top bank of digital pins (they were redundant anyway, plus makes more room for the screw and nut);

The switch that fits wsduino is number 24 in the chart below (used by sellers on ebay):

To recap, wsduino is the arduino-compatible board with DS3231 RTC and XBee support. To build a clock, just add a display shield like the 6-character LED display, the bicolor LED matrix shield ("Mondrian clock") or the 6-tube Nixie shield ("Rothko clock").

This would make a nice replacement for the original glass-domed WiseClock.


















I named it CubeClock for the simple reason that it is encased in a baseball display case, found on ebay for about $5.
It includes Wiseduino (with on-board RTC), a LiPo battery shield (I used the one from seeedstudio, but others should work too), a prototype shield with the cheap "orientation sensor" introduced here, and the bi-color LED mini-display shield.

The bottom board is the Wiseduino, secured to the box with 2 screws. The other shields are just stacked on top of each other. The battery shield from seeedstudio, discussed here, uses a 1,000mAh LiPo battery (did not come with the shield), attached to the shield itself with plastic ties. The clock can be turned on or off (to save the battery) from the power switch on the Wiseduino.

CubeClock can also be powered through the USB cable plugged into the battery shield (which also charges the LiPo battery), as shown below.















A closer look is shown in the next photo. The 2 buttons on the mini display shield and the power switch are on the opposite side. They are accessible after the top of box is removed, as is the FTDI connector.















The current sketch running on CubeClock is almost identical to the one on SillyClock (and IllyClock, for that matter), since the mini display shield uses almost the same schematic as the dual bi-color LED matrix shield.
The next release of the software should involve the "2-axis tilt sensor" (already connected on pin A3) to change the display according to its orientation. It could also include the displaying of messages from the 32KB EEPROM on the Wiseduino board (as does the glass-domed WiseClock).

Other ideas:

• add infrared receiver (on D2, with interrupt; code picked from WiseClock);
• add buzzer (on D16/A2, the only pin left unused at this point) for alarm clock functionality (half-implemented in the software already).

I've continued to add Arduino-compatible boards to the spreadsheet, bringing the count to 119 boards. You can get there easily by remembering "allarduinos" and going to http://tinyurl.com/allarduinos or http://bit.ly/allarduinos.

Some recent additions to the spreadsheet:

• Three (!) clock boards from Wise Time With Arduino:
  • Wise Clock 3 with a 32x16 Red-Green LED display (from Sure Electronics) has many different modes, including Pac Man, game of life, Pong, and... make your own!
    
  • ClockTHREE Junior (aka C3Jr), a collaboration with WyoLum, which is similar to the QlockTWO readable clock.
  • DWex, "Duino Watch for experimenters"-- chock full of SMD LED goodness; this actually came out last year but I missed it.
• From SparkFun comes the PTH (plated through-hole) Kit, very similar to Diavolino and my Minimalduino, but surprisingly priced at $30. It doesn't seem up to SparkFun's high standards though, since there is no power switch and the electrolytic capacitors are too tall, so shields won't fit.