This kit is hard to make! It's SMD soldering and it's freaking hardcore. We're selling them at just a little bit more than cost because this is for alpha users!

We're going to go into production on these and they will come mostly assembled. We are just selling these as alpha kits.

There is no guarantee or warranty at all. Bre has made four of them and three of them required a lot of fussing with the soldering until he got rid of all the solder bridges.

Specs:

* Atmega328 chip with Arduino bootloader on it.
* 6 pin header for bootloading. Also includes access to 4 I/O pins and power and ground
* 6 pin header for programming.
* 4 pin extension header for plugging in other things like sensors or shields that extend the watch.
* 16mhz crystal.
* Piezo buzzer
* 3 pushbutton switches

It has 12 LEDs to mark the hour and 12 LEDs to mark the 5 minute marks plus an extra 4 LEDs to mark the 4 extra minutes that aren't shown. So if it was 12:04 the hour LED in the 12 position would be lit up and the Minute LED in the 12 position would be lit up and the 4 extra minutes would be lit up to show that it's 12:04.

Besides having it work on a watch, there are a number of other possibilities because it's an arduino environment on your wrist!

You will need a TTL Cable and USBTiny programmer to program this kit. (Available here in the MakerBot store.

Documentation is available in the wiki at wiki.makerbot.com/makerbot-watch

We ordered a bunch of prototype boards and I've made them into 18 kits and put made them really cheap to just get them out there in the world and get friends playing with them. This is for alpha users because it is realllllly hard! I have soldered up 4 of them and 3 of them had major solder bridges that made me swear a lot. Be prepared for a serious smd challenge!

Here's the google group for it: groups.google.com/group/makerbotwatch If you get one, you really really really need to join!
Here's the wiki documentation: wiki.makerbot.com/makerbot-watch
Here's the link to the store where you can get it: store.makerbot.com/electronics/electronics-kits/makerbot-watch-kit.html

deriv of: thingiverse.com/thing:4399 but tinier!

This is a work in progress because I have yet to successfully program the ATMega 168.

This is the RepRap/MakerBot Extruder Controller, but without all the extruder-controlling bits. I would love to have a dedicated Unicorn Plotter controller board, but don't want to shell out $45 for one. The schematic just contains all the necessary parts for an Arduino to be controlled and powered over RS485 with two digital I/O ports.

The board file is experimental! It should work, but there's no guarantee.

By the way, this board costs around $20 (including components) to make, but only if it's priced in groups of 10.