Arduino · UNO R3
Content and en/rw/fr translations are drafts pending fluent educator review.
Reference photograph; identification only, not a wiring or pin map. See sources for image provenance.
Learning objectives
- Identify this example, its board class and pin limitations.
Before this introduction
UNO R3 is an ATmega328P microcontroller board: it runs a program without a Linux operating system. Its digital GPIO, analog inputs and selected PWM outputs have different jobs. The 5 V and GND pins are supply/reference pins, not digital pin numbers. UNO R4 is a different board; verify the exact pinout before choosing.
Learn only: circuit building, board simulation, firmware export and physical connection for this board are not available here.