sunfounder r3 board for arduino atmega328p atmega16u2 sunfounder technical details: <br> microcontroller: atmega328 <br> operating voltage: 5v <br> input voltage (recommended): 7-12v <br> input voltage (limits): 6-20v <br> digital i/o pins: 14 (of which 6 provide pwm output) <br> analog input pins: 6 <br> dc current per i/o pin: 40 ma <br> dc current for 3.3v pin: 50 ma <br> flash memory: 32 kb (atmega328) of which 0.5 kb used by bootloader <br> sram: 2 kb (atmega328) <br> eeprom: 1 kb (atmega328) <br> clock speed: 16 mhz <br> <br> package included: <br> 1x sunfounder r3 (compatible for arduino )<br><br>for more information, please view at<br>http://wiki.sunfounder.cc/index.php?title=main_page