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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Voltage level should be used for questions that are referring to using hardware together that operates on different voltages (the "concentration" of electricity).
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an open-source hardware company founded by Limor Fried in 2005. Use this tag to mention issues with Adafruit products or tutorials.
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An 8-bit, low power AVR microcontroller from Atmel.
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a small microcontroller derived from the Arduino Uno using the ATmega328. It is unique for its tiny size and the required external FTDI adapter.
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Refers to the code burned on the Arduino flash memory that runs every time the board is powered up. It starts the execution of user-loaded programs and allows uploading sketches from a PC through the …
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compiled code that is uploaded to an Arduino board.
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a part that acts like a switch that can be controlled by an Arduino. They usually are powered by sending current through a coil, which moves a piece of metal to touch a contact within it. (…
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a simple input component which responds to being pushed by a user.
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A sequence of characters -- including letters, numbers and symbols -- often used for representing information in a human-readable format.
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the process of updating or changing the sketch on the Arduino board. It does not refer to uploading to a server or a website.
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The physical circuitry and other components of a machine or device. This is distinct from the program code running on a device, which may be called software or firmware.
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a microcontroller board based on the ATmega32u4 and the Atheros AR9331. Use this tag for questions specifically regarding the Yún, and not just general Arduino usage.
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the family of microcontrollers used in Arduino boards.
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An ultra low-power transceiver for radio communication in the 2.4GHz ISM band (Industrial, Scientific, and Medical). Commonly used by tinkerers because of its low cost and its easy to use SPI interfac…
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Global Positioning System. Uses satellites to determine geographic location.
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an electrical power source which is often portable.
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to ask about electronics-related issues with your Arduino. For example: driver transistors, Ohm's Law, current-limiting resistors.
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A component which measures heat.
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Refers to code that present variables in the form of an array.
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Radio-Frequency Identification. Uses electromagnetic fields to transmit data for identification purposes, such as between a tag and a reader. RFID is the precursor to Near Field Communication (NFC).
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systematic examination of your Arduino sketch. It is intended to find and fix mistakes overlooked in the initial development phase, improving both the overall quality of software and th…
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a system which delivers data such as web-pages to a client system.
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A visual output device typically capable of displaying text and/or graphics. Can include various technologies, such as LCD, OLED, and TFT.
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Wireless refers to the technology allowing the transfer of information between two points that are not physically connected.
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An extension board for Arduino which provides functionality for controlling DC/stepper motors and other inductive loads (such as relays and solenoids).
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a form of light which is not visible to the human eye. It can be used in a variety of applications, including remote controls, data transfer, reflectance sensing, and proximity/motion…
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to refer to the volume of electricity traveling through any given wire at any given time. It is measured in amps.
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A component which measures G-force to detect which direction it is moved or tilted in.
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A microcontroller board based on the ATmega32u4 with built-in USB communication.
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for questions regarding how to get the time on an Arduino, how to create or use clocks with an Arduino, or anything that has time as a substantial factor in it. Also consider using [progr…
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a family of form factor compatible radio modules. Most are based on the 802.15.4-2003 standard.
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RGB (Red, Blue and Green) LED (Light Emitting Diode).
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Programming utility for AVR micro-controllers.
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a Universal Asynchronous Receiver/Transmitter. This refers to the "hardware" serial port in the processor. Use this tag for questions about hardware serial.
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to convert the code for a sketch into machine readable files that are uploaded to the Arduino. This tag is mostly used for the space and footprint of the files uploaded to the Arduino.