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8 Kbytes FLASH, 1 kbytes SRAM, 512 bytes EEPROM, USART, 4-channel 10 bit ADC, 2-channel 8 bit ADC
Pin compatible with Atmega48, ATMega88, ATMega168
Source: avr.lbrPB7(XTAL2/TOSC2)PB6(XTAL1/TOSC1)PB3(MOSI/OC2)PB2(SS/OC1B)PD4(XCK/T0)PC5(ADC5/SCL)PC4(ADC4/SDA)PC6(/RESET)DIL28-3Dual In Line 0.3 inchSUPPLY SYMBOLSUPPLY SYMBOLRESISTORResistor Basic schematic elements and footprints for 0603, 1206, and PTH 1/10th watt (small) resistors.0603-RES0402-RESPTH-1/6WCRYSTALCrystals Various standard crystals. Proven footprints. Spark Fun Electronics SKU : COM-00534HC49UVHC49US32-SMDEPSONMC14610.5X4.8Capacitor Standard 0603 ceramic capacitor, and 0.1" leaded capacitor.0603-CAP0402-CAPARDUINO_SERIAL_PROGRAMRA_LOCKLONGPADSCAP_POLCapacitor Polarized These are standard SMD and PTH capacitors. Normally 10uF, 47uF, and 100uF in electrolytic and tantalum varieties. Always verify the external diameter of the through hole cap, it varies with capacity, voltage, and manufacturer. The EIA devices should be standard.STAND-OFFStand Off

This is the mechanical footprint for a #4 phillips button head screw. Use the keepout ring to avoid running the screw head into surrounding components. SKU : PRT-00447ARDUINO_SERIAL_PROGRAMSTAND-OFFAXIAL-0.3RESISTOR

chip0603-RES0402-RESCAPACITOR

chip1/6W-RES1/6W Thru-hole Resistor - *UNPROVEN*1X06-SMDMOLEX-1X6-RA_LOCK1X06_LONGPADSHC49U-VCRYSTALCRYSTALCRYSTALCRYSTALCRYSTALCRYSTAL-32KHZ-SMDSHEILDCRYSTAL-SMD-5X3CRYSTAL-32KHZ-SMD_EPSON_MC146CRYSTAL-SMD-10.5X4.8-2PINCAP-PTH-SMALLCAP-PTH-SMALL2CAP-PTH-LARGE0603-CAP0402-CAPCAPACITOR

chipCAP-PTH-5MMEIA3216EIA3528CPOL-RADIAL-100UF-25VCPOL-RADIAL-10UF-25VEIA7343PANASONIC_GPanasonic Aluminium Electrolytic Capacitor VS-Serie Package GPANASONIC_EPanasonic Aluminium Electrolytic Capacitor VS-Serie Package EPANASONIC_CPanasonic Aluminium Electrolytic Capacitor VS-Serie Package ENIPPON_F80PANASONIC_DCPOL-RADIAL-1000UF-63VCPOL-RADIAL-1000UF-25VVISHAY_CSTAND-OFFStand Off

This is the mechanical footprint for a #4 phillips button head screw. Use the keepout ring to avoid running the screw head into surrounding components. SKU : PRT-00447STAND-OFF-TIGHTStand Off

This is the mechanical footprint for a #4 phillips button head screw. Use the keepout ring to avoid running the screw head into surrounding components. SKU : PRT-00447SUPPLY SYMBOLSUPPLY SYMBOLCRYSTALHC49GWHC49TL-HHC49U-HHC49U-LMHC49U-VHC49U70HC49UPHC13U-HHC18U-HHC18U-VHC33U-HHC33U-VMM20SSMM39SLCRYSTALCRYSTALHC49TL-HCRYSTALHC49U-HCRYSTALHC49U-LMCRYSTALHC49U-VCRYSTALHC49U70CRYSTALCRYSTALHC13U-HCRYSTALHC18U-HCRYSTALHC18U-VCRYSTALHC33U-HCRYSTALHC33U-VCRYSTALCRYSTALCRYSTALCRYSTALCRYSTALCRYSTAL RESONATORCRYSTALCRYSTAL2.1MMJACK2.1mm x 5.5mm THM DC jack with internal switch. Digikey part #PJ-102A, 4UCON part #05537
2.1mm x 5.5mm SMT DC jack with internal switch. Digikey part #PJ-002A-SMT, 4UCON part #03267

By microbuilder.eu & adafruit.com

DS1307

Real time clock (RTC) with battery backup ability. Talk to it via i2cPOWERJACK-1PJ-102ARING_SWDCJACK_2MM_SMT2.0/2.1mm DC Jack - SMT

4UConnector: 03267

Note: Small tRestrict polygon's were added to the ground pads to improve solderability when this part is used in combination with a ground pour. By default, Eagle will product four large bridges to the ground pour significantly increasing the heat distribution on the pads and preventing lead-free solder from reflowing in certain situations. For more details, see: http://www.microbuilder.eu/Blog/09-12-14/Reducing_Thermals_for_Large_Pads_in_Eagle.aspx

GNDBREAKDual In Line Packagecon-molexcon-molex22-23-2101.100" (2.54mm) Center Header - 10 Pincon-molexcon-molex22-23-2101.100" (2.54mm) Center Header - 10 PinAO_dotklokAO_dotklokCR1220_THMCR1220 coin cell holder, Mouser.com part # 534-500AO_dotklokAO_dotklokCR1220_THMCR1220 coil cell holder, Mouser.com part #534-500PIN HEADERPIN HEADER2,15/1,0THROUGH-HOLE PAD2,15/1,0THROUGH-HOLE PADPINHD-1X2PIN HEADERPIN HEADER1X02/90PIN HEADERpinhead_aopinhead_aoPINHD-1X3PIN HEADERpinhead_aopinhead_aoPIN HEADER1X03/90PIN HEADERHEADER TO RIBBON DESIGNMOUNTING HOLES FOR PCBDOTKLOK (REV 1.1) JUNE 7, 2011Andrew O'Malley www.aomalley.orgDS1307 schematic from adafruit.comAVAILABLE AS A FULL KIT INCLUDING PCB FROM WWW.AOMALLEY.ORG/DOTKLOKMINI PROTOTYPING AREAReleased under Creative Commons Attribution-Sharealike (CC BY-SA 3.0) licenseATmega328PSTAND-OFFSTAND-OFFCR1220_THM22-23-21012.1MMJACKTHM% <default!Ceͫm% 5!Ceͫl % 5!Ceͫq% 5!Ceͫ% 5!Ceͫ?% 5!Ceͫ0|\% 5!CeͫqR% 5!CeͫR