While an Arduino128 or the SiameseDuino is an excellent option for new purchases, I think an IO expanding shield with a second I2C slaved Atmega128 on it and a second set of IO pins might be a good option for existing Arduino owners.
ok, that sounds like a good idea for people with 2 seriall devices. and lets say i want to program them, will there be a jumper that decides which arduino the info is being sent to?and powerwise, will having 2 arduinos requiere more juice? or will 5 volt be enough for both to run as spotless as 1?
QuoteWhile an Arduino128 or the SiameseDuino is an excellent option for new purchases, I think an IO expanding shield with a second I2C slaved Atmega128 on it and a second set of IO pins might be a good option for existing Arduino owners.There are I2C data-expander IC chips already. They connect via I2C and give you as many virtual digitial I/O pins as you care to buy chips for.While a 2 mcu arduino may have its uses, extra I/O is a silly reason.
We built it to add a second serial buffer, the additional I/O's was a "side-effect". Originally we hadn't planned on having more than 3 DI/O's per IC, because that's all we needed for our application. But we then decided others might be interested in solving different problems with it, so we added the rest in plus a header for 3 i2c devices.If we only wanted a I/O expander, we would have used 595's and 4021's - we've got another board in design which is based on two 595's and two 4021's, and like the dCoreduino, they too can be daisy chained. That suits a need we have, others also might have a use for them so we'll put them out there as well once we've taken delivery.
i'm lacking in techonlogical expiereince...where is the usb connector?and the dip switches to decide which arduino is being controllled?also the barrel plug power connector?if those are already taken care of, then i think there should be some more room for more gnd and 5v pins, becuase it doesent look like enough... there looks to be a small bit of room around the board, and i believe those small spaces would be perfect for 4 gnd on one corner, with 5v on the same side, and opposite on the other side so:_______________________________________ gnd 5v arduino pins and atmega and such 5v gnd -------------------------------------------------------