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CAD mechanical\u002Fsource hash manifest in docs\u002Fverification\u002Fcatalog\u002F2026-10-16-board-drafts.md.",{"id":42,"name":43,"manufacturer":43,"ecosystem":43,"descriptionKey":1260},"families.arduino.description",[1262,1265,1271,1275,1278,1281],{"id":46,"publisher":43,"title":19,"documentType":1263,"version":1264,"url":20,"accessedDate":54},"reference_manual","2022-10-06",{"id":47,"publisher":1266,"title":1267,"documentType":1268,"version":1269,"url":1270,"accessedDate":54},"Microchip Technology","ATmega328P 8-bit AVR Microcontroller Datasheet","datasheet","DS40002061B","https:\u002F\u002Fww1.microchip.com\u002Fdownloads\u002FaemDocuments\u002Fdocuments\u002FMCU08\u002FProductDocuments\u002FDataSheets\u002FATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061B.pdf",{"id":48,"publisher":43,"title":1272,"documentType":1273,"version":1274,"url":28,"accessedDate":54},"Arduino Uno Rev3 Schematic (A000066)","schematic","Rev3",{"id":49,"publisher":43,"title":1276,"url":1277,"documentType":1263,"accessedDate":54},"Arduino Uno through-hole Rev3e Eagle CAD","https:\u002F\u002Fdocs.arduino.cc\u002Fstatic\u002F6bb7a3ca51ebee82a252f60c0b418787\u002FA000066-cad-files.zip",{"id":50,"publisher":43,"title":1279,"url":1280,"documentType":1263,"accessedDate":54},"Arduino AVR Core standard variant pin mapping","https:\u002F\u002Fgithub.com\u002Farduino\u002FArduinoCore-avr\u002Fblob\u002Fmaster\u002Fvariants\u002Fstandard\u002Fpins_arduino.h",{"id":51,"publisher":43,"title":1282,"url":36,"documentType":1268,"accessedDate":54},"Arduino UNO R3 board datasheet",[1284,1287,1290,1293],{"slug":1285,"name":1286},"arduino-nano-classic","Arduino Nano Classic",{"slug":1288,"name":1289},"arduino-pro-mini","Arduino Pro Mini",{"slug":1291,"name":1292},"arduino-mega-2560","Arduino Mega 2560 Rev3",{"slug":1294,"name":1295},"arduino-pro-micro","Arduino Pro Micro",[],[1083],{"title":1299,"description":1300,"card":1301,"intro":1302,"safe":1303,"adc":1304,"interfaces":1305,"strapping":1306,"input":1307,"overview":1308},"Arduino Uno R3 (ATmega328P) Pinout & Diagram","Complete Arduino Uno R3 pinout diagram and electrical reference. ATmega328P MCU, 5V logic, 14 digital I\u002FO, 6 PWM, 6 ADC channels, ICSP header.","Classic 5V ATmega328P development board with DIP-28 socket, 14 digital I\u002FO and 6 analog inputs.","Arduino Uno R3 uses an ATmega328P at 5 V and 16 MHz. The main MCU clock comes from a ceramic resonator; a separate quartz crystal clocks the ATmega16U2 USB bridge.","Arduino specifies a 20 mA maximum per I\u002FO. The ATmega328P ratings of 40 mA per I\u002FO and 200 mA through VCC\u002FGND are absolute maxima, not operating targets; port-group current limits also apply.","Pins A0-A5 provide 10-bit analog-to-digital conversion (0-1023) referenced to 5V (or AREF). Pins A4 (SDA) and A5 (SCL) are shared with the I2C bus.","UART on D0 (RX) and D1 (TX). SPI on D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK) and the 6-pin ICSP header. I2C on A4 (SDA) and A5 (SCL) plus dedicated top header pins.","No hardware strapping pins. D13 has an onboard LED buffer. D0\u002FD1 are tied to the USB-to-serial converter (ATmega16U2).","All digital pins support bidirectional I\u002FO with optional internal pull-up resistors (20-50 kΩ). Analog pins A0-A5 can also function as digital GPIO 14-19.",{"summary":1309,"power":1310,"notes":1314,"useCases":1318,"before":1322,"variants":1326,"blueprint":1330},"Arduino Uno R3 is the foundational 8-bit development board based on the Microchip ATmega328P. It features standard 0.1\" shield headers, 5 V logic, a removable DIP-28 MCU socket, and an onboard ATmega16U2 USB-serial bridge.",{"usb":1311,"vin":1312,"five":1313},"USB Type-B connector (5 V DC, 500 mA resettable polyfuse protected)","VIN or centre-positive 2.1 mm DC jack: 7–12 V recommended; board input limits 6–20 V. Regulator heating limits the available current.","The 5 V pin is connected to the board supply rail. Available current depends on the power source, regulator temperature and onboard loads; the regulator part rating is not a guaranteed output budget. The 3.3 V pin is rated at 50 mA.",{"logic":1315,"current":1316,"bootloader":1317},"GPIO operate at 5 V. Check the input ratings of each connected device before driving it from a 5 V output; inputs that accept only 3.3 V may need level translation.","Design below the board’s 20 mA per-I\u002FO ceiling and respect the MCU port-group budgets. The 40 mA per-I\u002FO and 200 mA VCC\u002FGND absolute maxima do not guarantee normal operation.","Preloaded with Optiboot 115200 baud bootloader; standard firmware uploads use D0 (RX) and D1 (TX) with auto-reset via DTR capacitor.",{"education":1319,"prototyping":1320,"shields":1321},"Introductory robotics, computer science, and electronics education.","Rapid bench prototyping using standard 2.54mm breadboard jumper wires.","Stackable Arduino Uno R3 compatible expansion shields.",{"logic":1323,"current":1324,"aref":1325},"Confirm attached sensors and modules accept 5 V logic levels without damage.","Check per-pin and port-group currents before wiring loads. Use external drivers for motors, relays and other loads that exceed GPIO capability.","Do not exceed 5 V on the AREF pin; do not connect external voltage if internal analogReference() is configured.",{"dip":1327,"r4":1328,"bridge":1329},"The through-hole Uno R3 has a replaceable ATmega328P-PU. The Uno R3 SMD uses a different MCU package and layout; this drawing models the through-hole revision.","UNO R4 Minima and UNO R4 WiFi are separate Renesas-based boards. Do not apply the Uno R3 MCU pin mapping or current limits to them.","Compatible boards may use a different USB bridge or connector. Check that board’s schematic and driver; the ATmega16U2 ICSP1 shown here is not present on every clone.","The drawing follows official Arduino A000066 through-hole Rev3e Eagle CAD: socketed ATmega328P, ATmega16U2 USB bridge and two separate six-contact ICSP headers. It shows 44 physical header contacts, including duplicated signals and power contacts.",1793836403236]