# AVR Butterfly

> single board computer

**Wikidata**: [Q4655065](https://www.wikidata.org/wiki/Q4655065)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/AVR_Butterfly)  
**Source**: https://4ort.xyz/entity/avr-butterfly

## Summary
The AVR Butterfly is a single-board computer (SBC), which is a complete computer built on a single printed circuit board that integrates a processor, memory, storage, and input-output interfaces. It is classified as an instance of a single-board computer, a form factor that integrates core components like a CPU, RAM, and flash memory directly onto the board, distinguishing it from separate motherboards.

## Key Facts
- **Definition:** A single-board computer (SBC) is a complete computer built on a single circuit board.
- **Classification:** An instance of a single-board computer; a subclass of both *computer* and *motherboard*.
- **Core Components:** Typically includes a central processing unit (CPU), voltage regulator, RAM, flash memory, and various electrical connectors.
- **Distinguishing IDs:**
  - GND ID: 4191878‑2
  - Freebase ID: /m/01bl_p
  - BabelNet ID: 01215644n
- **Wikidata Description:** "single board computer".
- **Image:** Available via Wikimedia Commons at `https://commons.wikimedia.org/wiki/Special:FilePath/AVRButterfly.jpg`.
- **Freebase ID (Specific to AVR Butterfly):** /m/07vhph.
- **Wikipedia Title:** AVR Butterfly.
- **Commons Category:** AVR Butterfly.
- **Wikipedia Languages:** Available in Commons, English, and Persian (fa).
- **Sitelink Count:** 3.
- **First Notable SBC Example:** The KIM‑1, introduced in 1975.
- **Popular Modern SBC Example:** The Raspberry Pi 4 Model B, released on June 24, 2019.

## FAQs
### Q: What is the AVR Butterfly?
**A:** The AVR Butterfly is a single-board computer (SBC), meaning it is a complete, functional computer system built on a single printed circuit board.

### Q: How is a single-board computer like the AVR Butterfly different from a standard desktop motherboard?
**A:** Unlike a standard motherboard which requires separate components like a CPU and RAM to be installed, a single-board computer integrates these essential elements directly onto the board itself, forming a complete system.

### Q: What are the primary uses for devices like the AVR Butterfly?
**A:** Single-board computers are commonly used as embedded system controllers, in Internet of Things (IoT) devices, for educational purposes, and for hobbyist projects due to their compact size and integrated design.

## Why It Matters
The AVR Butterfly represents the class of single-board computers (SBCs), a form factor that has fundamentally changed the accessibility and application of computing. SBCs like the AVR Butterfly are critical because they condense full computer systems—processor, memory, and I/O—onto a single, compact board, eliminating the need for separate chassis and multiple components. This design makes them ideal for embedded systems, robotics, and IoT devices where space and power are limited. Their low cost and small footprint have democratized computing, making them powerful tools for education, prototyping, and innovation, allowing hobbyists, students, and startups to build complex projects without the expense and bulk of traditional desktop computers.

## Notable For
- **Integrated Design:** Combines CPU, memory, and I/O onto one board, a defining characteristic of the single-board computer class.
- **Versatile Form Factor:** As an SBC, it belongs to a category used in a vast array of applications, from embedded controllers to educational kits.
- **Part of an Influential Class:** It is an instance of the single-board computer class, which includes landmark devices like the 1975 KIM-1 and the modern Raspberry Pi, a major force in computer education and hobbyist electronics.

## Body

### Classification and Definition
The AVR Butterfly is explicitly classified as a **single-board computer (SBC)**. An SBC is defined as a complete computer built on a single printed circuit board. This classification places it as a form factor that is a subclass of both *computer* and *motherboard*. Unlike a traditional motherboard which serves as a foundation for other components, an SBC like the AVR Butterfly integrates the processor, memory, and storage directly, allowing it to function as a standalone system.

### Core Components and Architecture
As a single-board computer, the AVR Butterfly's architecture follows the standard definition of its class. It is built on a single printed circuit board (PCB) that houses all essential components for operation. These components typically include:
- A **Central Processing Unit (CPU)**
- A **voltage regulator module**
- **RAM**, often in the form of an integrated circuit
- **Flash memory**, also typically an integrated circuit
- **Electrical connectors** for power, display, and peripherals

### Identifiers and Online Presence
The AVR Butterfly has several unique identifiers across knowledge bases:
- **Wikidata:** Identified as a "single board computer."
- **Freebase ID:** `/m/07vhph`.
- **Commons Category:** "AVR Butterfly," with an image file available at `https://commons.wikimedia.org/wiki/Special:FilePath/AVRButterfly.jpg`.
- **Wikipedia:** The article title is "AVR Butterfly," and it is available in 3 languages: Commons, English (`en`), and Persian (`fa`). It has a sitelink count of 3.

### Context of Single-Board Computers
The AVR Butterfly is an instance of the broader SBC category, which has a rich history and defined characteristics:
- **History:** The first notable SBC was the KIM-1, introduced in 1975. A modern, popular example is the Raspberry Pi 4 Model B, released on June 24, 2019.
- **Key Distinctions:** SBCs are distinct from **System-on-Chip (SoC)** and **System-on-Module (SoM)** designs. An SoC integrates components onto a single chip, while an SoM is a module that plugs into a carrier board. An SBC is a complete board that may contain an SoC.
- **Common Applications:** Devices of this class are widely used in embedded systems, Internet of Things (IoT) devices, robotics, education, and for prototyping.
- **Advantages:** The primary benefits of the SBC form factor include compact size, low power consumption, reduced bill-of-materials (BOM) cost, and simplified design which leads to a faster time-to-market.