###The chessboard

The awesome wobbly chessboard shown in the image, and its belonging pieces, are designed by MikeyB

I did however alter the base of the pieces to be a bit more hollow, and I removed the last couple of layers. This way the pieces always stand upright and give the magnets inside a stronger pull force. I've included the new base file (New_piece_base.stl).

###The chess clock

The clock can be constructed with the following components:

• 2 x 10kΩ potentiometer + cap
• 2 x TM1637 4 digit 7 segment display (with colon)
• 3 x (6x6mm) tactile push button
• 1 x Piezo buzzer
• 1 x on/off pressure switch
• 1 x 9-volt battery
• 1 x Arduino Nano
• 4 x m2 bolt (length between 1-2 cm)

Note that the links are only meant to be a reference to the components I used (sizing and looks). These components can of course be found and bought a lot cheaper if one cares to look. In general, the design is quite size-flexible since it's just a housing.

Thankfully these components are all cheap and to me considered essentials when tinkering with microcontrollers. It makes for a great starter project.

Button notes The buttons on the clock are made as bolts houseing a 6x6mm standard push buttons. The bolt can be put through the main case and secured with a nut from the inside. The legs of the button poke through the bottom of the bolt so the legs can be soldered onto. A really low layer height like 0.12mm made the bolt and nut screw together much smoother. An "extension block" is placed on top of the button so it can be pushed. This extension is secured to the button with a really small dabble of locktite. If too much glue is applied the button will get stuck. I also found it hard to solder on the button legs without burning through the plastic. So instead of placing solder on the leg, I pre-placed solder on the wire which insured a much more brief operation.

Housing notes There are small ledges on the inside of the clock to help secure an Arduino Nano.

Display notes The displays are pressure-fitted using a frame (Display_frame.stl). I did use some glue to avoid accidentally pushing the displays into the case when playing. My displays had angled connector pins which I replaced with straight ones in order to fit the displays in the housing. One of my displays stopped working after this, so be a bit careful tinkering with the pins.

#####An electrical diagram can be found here. Note that the exact pins do not match the code.

#####The code I used can be found here Updated link to TM1637 library here

#####A demonstration of the watch can be found here

Keep in mind I'm, not an engineer so be kind to my code and wiring.