Squirrels have fuzzy tails.
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There is absolutely no reason why it couldn't be done using a NXT set.
Im too lazy to look at the NXT datasheets, but perhaps it doesn't have enough memory?I maxed out with a 15x15 map using the ATmega168 . . .something to look in to . . .
I was thinking about the memory limitations. What if we use a (I2C) serial EEPROM to store the big map an pull parts of it in the internal (ram) memory of the MCU? Say we can hold a 10x10 grid in memory and 100x100 in the eeprom, every time we reach close to a side of the small grid we update it to the big grid and load the neighbour 10x10 in ram... Would this be possible? How big should be the eeprom?