content: I only like the arduino when I am trying to get entire board cost down to 1.50 usa.  But it has only couple kilobytes of working heap and stack ram total! The sweet spot chip is usually : 32k Flash /2k RAM/16MHz CPUClock yep ! that is goddamned tiny! For double the price you can get over 32 times more ram storage, but then you would not get to do a $1.50 complete product.