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.

A microcontroller board based on the ATmega32u4 with built-in USB communication.
186 questions
Real-Time Clock. Keeps track of current date/time. Some have batteries like the DS3231, and the DS3231 also has programmable alarms that can interrupt an Arduino.
186 questions
A component which measures G-force to detect which direction it is moved or tilted in.
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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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Hypertext Transfer Protocol (HTTP) is an application level network protocol that is used for the transfer of content on the World Wide Web.
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Is a standard library function. It returns the number of milliseconds since the Arduino board began running the current program.
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Refer to the HC-05 Bluetooth module.
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Using an Arduino to play noise, sounds, or music. Also for questions about audio input.
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Sleep refers to a form of power management, where the processor can be instructed to enter various levels of "sleep". Use this tag for discussions about sleep mode.
166 questions
Variables are used to store data in a sketch/program.
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Radio Frequency. Typically used to refer to the radio portion of the electromagnetic spectrum which is used for wireless communication. Strictly speaking though, RF can refer to any oscillation (elect…
158 questions
To compile is 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.
155 questions
Voltage is the difference in electric potential between two points of an electric circuit, measured in Volts (V). Voltage can be constant (DC) or varying (AC).
154 questions
For questions about integrating the Arduino microcontroller with the single-board computer Raspberry Pi. Questions just about Raspberry Pi are off-topic but can be asked on Raspberry Pi Stack Exchange…
149 questions
In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another
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XBee is a family of form factor compatible radio modules. Most are based on the 802.15.4-2003 standard.
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Wire is a conductor that used to connect electronic components each other
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for questions about robotics.
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for questions about memory usage on the Arduino.
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Teensy is a cheap and powerful development board with some Arduino compatibility.
140 questions
for memory management or issues in programming.
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Used to describe the act of (often wirelessly) controlling another system.
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Sending one data bit in a time. Used mostly in RS232 context.
134 questions
An Atmel 8-bit AVR microcontroller.
134 questions
An error that is generated during the compilation phase, often due to problems with invalid syntax and/or types. Not for errors during the uploading or execution phase.
133 questions
The Pro Micro is an Arduino-compatible microcontroller. It is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board…
133 questions
Electronic component forming a three-terminal resistor with a sliding contact. Acts as a variable resistor / voltage divider, manipulating the amount of current flowing through it.
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Low-power 8-bit AVR microcontroller with 256kB flash.
131 questions
Digital refers to signals which are either on or off (high or low, one or zero). This contrasts with analog signals which have a range of values.
131 questions
The process of improving the efficiency of a program such that is uses less memory and/or less computational time.
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Integrated Development Environment - software that allows you to write and compile code. Use the arduino-ide tag for questions about the official Arduino software.
130 questions
to ask programming questions regarding reading input from it or blinking the lights, etc.
127 questions
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Flash memory is a type of memory available on the Arduino boards. It can be accessed from a program using PROGMEM directive to store data. For questions about using and accessing flash memory, use thi…
124 questions
logging data into some storage or memory
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