I wanted to share the logic board I built for my monome using the unsped shield and the iDuino (an Arduino clone).
The iDuino is the cheapest Arduino compatible board I could find that has a full-sized USB-B connector. I omitted the headers and soldered wires directly to the board (see attached picture).
Unsped shield $7.68 from group buy
iDuino kit $17.82 + $3.02 shipping from spiffie.org
74hc164 and 74hc165 $0 (free samples) from Fairchild Semiconductor
MAX7221CNG $0 (free sample) from Maxim
Resistor network, socket, filtering caps
> It's hard to label the monome project as "elitist" or "exclusive" when you can build a 40h for under $150 on a budget and use it with all this great free open-source software.
shit, just look at edison's
sparkfun buttons pull their weight, but i think they're too big for practical use. an 8x8 sparkfun board is nearly as big as my 256.
i think your
You're probably right about the Digi-Key shipping -- I got my components as part of a larger order which cost $2.50 to ship USPS. Maybe "How to build a logic board for $32" would be a more accurate title.
The 3.3v is a standard Arduino pin. On the site it says the iDuino doesn't break out the 3.3v pin but I verified it on the multimeter and it turned out to work just fine. Saved me from having to add a voltage converter for the accelerometer chip. So you get two nice features not present on the official logic board (3.3v out and easy reprogramming over USB).
I was thinking about drilling mounting holes but the bottom of my case is too thin for blind holes and I didn't want any exposed screws. I ended up using this sticky wax stuff intended for mounting posters. When I'm sure I don't want to change anything on the circuit board (e.g. I_set resistor value) I may glue it in place.
Sparkfun button pads -- yes they are huge! I bought an official button pad kit from monome with no regrets. It's well worth the extra cost just for having everything on one PCB. I'm still envisioning a DIY button solution since they are the most expensive part and the hardest to obtain.
nice wireup! looks very clean. i'd like to see more clones built from non-monome non-sparkfun lit keys. they always have a lot of character.
where was the PCB from? just one big one insteada 4x wired together?
is it an official monone oboard?
please either Sign In or
register to participate in the discussion.