A000005 Datasheet by Arduino

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ARDUINONANO

Code:A000005

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TheArduinoNanoisacompactboardsimilartotheUNO.

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TheArduinoNanoisasmall,complete,andbreadboard‐friendlyboardbasedon

theATmega328(ArduinoNano3.x).Ithasmoreorlessthesamefunctionalityof

theArduinoDuemilanove,butinadifferentpackage.ItlacksonlyaDCpowerjack,

andworkswithaMini‐BUSBcableinsteadofastandardone.

GettingStarted

YoucanfindintheGettingStartedsectionalltheinformationyouneedto

configureyourboard,usetheArduinoSoftware(IDE),andstarttinkerwithcoding

andelectronics.

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https://www.arduino.cc/en/Guide/HomePage

https://www.arduino.cc/en/Main/Software

TECHSPECS

MicrocontrollerATmega328

ArchitectureAVR

OperatingVoltage5V

FlashMemory32KBofwhich2KBusedbybootloader

SRAM2KB

ClockSpeed16MHz

AnalogI/OPins8

EEPROM1KB

DCCurrentperI/OPins40mA(I/OPins)

InputVoltage7‐12V

DigitalI/OPins22

PWMOutput6

PowerConsumption19mA

PCBSize18x45mm

Weight7g

ProductCodeA000005

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 OSH:Schematics

TheArduinoNanoisopen‐sourcehardware!Youcanbuildyourownboardusing

thefollowingfiles:

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EAGLEFILESIN.ZIP

https://content.arduino.cc/assets/arduino‐nano‐reference.zip

SCHEMATICSIN.PDF

https://www.arduino.cc/en/uploads/Main/Arduino_Nano‐Rev3.2‐SCH.pdf

Power

TheArduinoNanocanbepoweredviatheMini‐BUSBconnection,6‐20V

unregulatedexternalpowersupply(pin30),or5Vregulatedexternalpowersupply

(pin27).Thepowersourceisautomaticallyselectedtothehighestvoltagesource.

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Memory

TheATmega328has32KB,(alsowith2KBusedforthebootloader.The

ATmega328has2KBofSRAMand1KBofEEPROM.

InputandOutput

Eachofthe14digitalpinsontheNanocanbeusedasaninputoroutput,using

pinMode(),digitalWrite(),anddigitalRead()functions.Theyoperateat5volts.

Eachpincanprovideorreceiveamaximumof40mAandhasaninternalpull‐up

resistor(disconnectedbydefault)of20‐50kOhms.Inaddition,somepinshave

specializedfunctions:

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 Serial:0(RX)and1(TX).Usedtoreceive(RX)andtransmit(TX)TTLserialdata.These

pinsareconnectedtothecorrespondingpinsoftheFTDIUSB‐to‐TTLSerialchip.

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 ExternalInterrupts:2and3.Thesepinscanbeconfiguredtotriggeraninterruptonalow

value,arisingorfallingedge,orachangeinvalue.SeetheattachInterrupt()functionfor

details.

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 PWM:3,5,6,9,10,and11.Provide8‐bitPWMoutputwiththeanalogWrite()function.

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 SPI:10(SS),11(MOSI),12(MISO),13(SCK).ThesepinssupportSPIcommunication,

which,althoughprovidedbytheunderlyinghardware,isnotcurrentlyincludedinthe

Arduinolanguage.

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 LED:13.Thereisabuilt‐inLEDconnectedtodigitalpin13.WhenthepinisHIGHvalue,

theLEDison,whenthepinisLOW,it'soff.

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TheNanohas8analoginputs,eachofwhichprovide10bitsofresolution(i.e.

1024differentvalues).Bydefaulttheymeasurefromgroundto5volts,thoughisit

possibletochangetheupperendoftheirrangeusingtheanalogReference()

function.Analogpins6and7cannotbeusedasdigitalpins.Additionally,some

pinshavespecializedfunctionality:

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 I2C:4(SDA)and5(SCL).SupportI2C(TWI)communicationusingtheWirelibrary

(documentationontheWiringwebsite).

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Thereareacoupleofotherpinsontheboard:

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 AREF.Referencevoltagefortheanaloginputs.UsedwithanalogReference().

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 Reset.BringthislineLOWtoresetthemicrocontroller.Typicallyusedtoaddareset

buttontoshieldswhichblocktheoneontheboard.

Communication

TheArduinoNanohasanumberoffacilitiesforcommunicatingwithacomputer,

anotherArduino,orothermicrocontrollers.TheATmega328provideUARTTTL(5V)

serialcommunication,whichisavailableondigitalpins0(RX)and1(TX).AnFTDI

FT232RLontheboardchannelsthisserialcommunicationoverUSBandtheFTDI

drivers(includedwiththeArduinosoftware)provideavirtualcomporttosoftware

onthecomputer.TheArduinosoftwareincludesaserialmonitorwhichallows

simpletextualdatatobesenttoandfromtheArduinoboard.TheRXandTXLEDs

ontheboardwillflashwhendataisbeingtransmittedviatheFTDIchipandUSB

connectiontothecomputer(butnotforserialcommunicationonpins0and1).A

SoftwareSeriallibraryallowsforserialcommunicationonanyoftheNano'sdigital

pins.TheATmega328alsosupportI2C(TWI)andSPIcommunication.TheArduino

softwareincludesaWirelibrarytosimplifyuseoftheI2Cbus.TousetheSPI

communication,pleaseseeATmega328datasheet.

Programming

TheArduinoNanocanbeprogrammedwiththeArduinosoftware(download).

Select"ArduinoDuemilanoveorNanow/ATmega328"fromtheTools>Board

menu(accordingtothemicrocontrolleronyourboard).TheATmega328onthe

ArduinoNanocomespreburnedwithabootloaderthatallowsyoutouploadnew

codetoitwithouttheuseofanexternalhardwareprogrammer.Itcommunicates

usingtheoriginalSTK500protocol.Youcanalsobypassthebootloaderand

programthemicrocontrollerthroughtheICSP(In‐CircuitSerialProgramming)

headerusingArduinoISPorsimilar.

Automatic(Software)Reset

Ratherthenrequiringaphysicalpressoftheresetbuttonbeforeanupload,the

ArduinoNanoisdesignedinawaythatallowsittoberesetbysoftwarerunningon

aconnectedcomputer.Oneofthehardwareflowcontrollines(DTR)ofthe

FT232RLisconnectedtotheresetlineoftheATmega328viaa100nanofarad

capacitor.Whenthislineisasserted(takenlow),theresetlinedropslongenough

toresetthechip.TheArduinosoftwareusesthiscapabilitytoallowyoutoupload

codebysimplypressingtheuploadbuttonintheArduinoenvironment.Thismeans

thatthebootloadercanhaveashortertimeout,astheloweringofDTRcanbe

well‐coordinatedwiththestartoftheupload.Thissetuphasotherimplications.

WhentheNanoisconnectedtoeitheracomputerrunningMacOSXorLinux,it

resetseachtimeaconnectionismadetoitfromsoftware(viaUSB).Forthe

followinghalf‐secondorso,thebootloaderisrunningontheNano.Whileitis

programmedtoignoremalformeddata(i.e.anythingbesidesanuploadofnew

code),itwillinterceptthefirstfewbytesofdatasenttotheboardaftera

connectionisopened.Ifasketchrunningontheboardreceivesone‐time

configurationorotherdatawhenitfirststarts,makesurethatthesoftwarewith

whichitcommunicateswaitsasecondafteropeningtheconnectionandbefore

sendingthisdata.

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https://store.arduino.cc/usa/arduino‐usb‐2‐serial‐micro12‐7‐17

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