More pins and more power with a DIY Sanguino

http://hackadaycom.files.wordpress.c...5/sanguino.jpg
Not long after [CulinarilySpeaking] got into the Arduino game, he began to want more IO pins and a larger program space for more ambitious projects. This, of course, led him down the path towards the Sanguino, the ATMega644-based dev board with many more IO pins than Arduino boards based on the ATMega328. Instead of buying new, [CulinarilySpeaking] decided to make his own Sanguino, and the results look fantastic.
After coming across an ATMega644 while browsing for parts on line, [CulinarilySpeaking] found the micro that had enough power and pins to do some fairly complex stuff. A bunch of other people though about using this chip in the Arduino environment before, so all [CulinarilySpeaking] had to do was copy the circuit with the parts he had on hand.
After soldering all the components to the neat breadboard-style PCB, [CulinarilySpeaking] fired up the Arduino IDE and put the Blink example on the 644. Everything worked, so now there’s a board with much more power than a standard Arduino built with only $8 USD in parts.
via reddit

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