Arduino UNO R3 User Manual

Arduino® UNO R3
3 / 13 Arduino® UNO R3 / Rev. 01 - 25/11/2021
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CONTENTS
1 The Board
1.1 Application Examples
1.2 Related Products
2 Ratings
2.1 Recommended Operating Conditions
2.2 Power Consumption
3 Functional Overview
3.1 Board topology
3.2 Processor
3.3 Power Tree
4 Board Operation
4.1 Getting started - IDE
4.2 Getting started - Arduino Web Editor
4.3 Getting started - Arduino IoT Cloud
4.4 Sample Sketches
4.5 Online Resources
4.6 Board Recovery
5 Connector Pinouts
5.1 JANALOG
5.2 JDIGITAL
5.3 Mechanical Information
5.4 Board Outline & Mounting Holes
6 Certifications
6.1 Declaration of Conformity CE DoC (EU)
6.2 Declaration of Conformity to EU RoHS & REACH 211 01/19/2021
6.3 Conflict Minerals Declaration
7 FCC Caution
8 Company Information
9 Reference Documentation
10 Revision History

Arduino UNO R3 Specifications

General

Microcontroller	ATmega328P
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limit)	6-20V
Digital I/O Pins	14 (of which 6 provide PWM output)
PWM Digital I/O Pins	6
Analog Input Pins	6
DC Current per I/O Pin	20 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM	2 KB (ATmega328P)
EEPROM	1 KB (ATmega328P)
Clock Speed	16 MHz
LED_BUILTIN	13
Length	68.6 mm
Width	53.4 mm
Weight	25 g