Funduino UNO R32012 launchedan easy to useopen-sourcecontrollerhardwareandArduino UNOandno major changes, the biggest difference is that USB to serialpart of the circuits witch is a AT Mega 16U2 micro controller, whichthe costincrease,the software part of the same as before,no major changes.
Functions:
PinchangesplustwoI2Cpins(SDAandSCL:nexttotheAREFpin,the Analog4and 5copy,nottheadditionalI2C interface),added two pins,theRESETnextoneisIOREF,, allowingtheexpansion boardto adapt toon-board voltage,thispinisjust told to expand the board'scurrent on-board voltage(such asUNO is5V,thepower supplypincan be seen ascopy,does not providethelevelpull-up), and the otherisafterinactiveplaceholderpins.
(2)more stable RESET circuit.RESET key position has changed,bemoved close to theUSB interfaceboardcorner,more convenient topress.
3ATmega16U2to replacea8U2,this does not meana16K flashR3tomake yourcoderunfaster, thisupdatefor theUSB interface chip,in theory,it allowstheUNOcanemulate USBthe HID,such asthe MIDI/Joystick / Keyboard.
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