# SpenceKonde/ATTinyCore

Arduino core for ATtiny 1634, 828, x313, x4, x41, x5, x61, x7 and x8

Repository: https://github.com/SpenceKonde/ATTinyCore
Canonical: https://ross.abutalabs.com/products/attinycore
Language: C
License: NOASSERTION
License Family: other
Topics: attiny, arduino, avr, microcontroller
Last push: 2024-10-18T04:09:45+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4174, "days_push": 684, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1770, forks 334 (observed 2026-08-28T04:05:33.953218+00:00)

## What it is
An Arduino core providing support for nearly all classic ATtiny AVR microcontrollers, including the x4/x5/x61/x7/x8 series, 1634, 828, and x313. It enables programming these chips via ISP, serial (Optiboot), or VUSB (Micronucleus) with the standard Arduino toolchain.

## Use cases
- program an ATtiny85 with the Arduino IDE
- flash Arduino sketches to ATtiny 1634 or 828 microcontrollers
- use Arduino APIs on classic tinyAVR chips
- upload firmware to ATtiny via ISP or Optiboot bootloader
- develop embedded projects on ATtiny x4, x41, x5, x61, x7, or x8 parts
- program ATtiny over USB with Micronucleus/VUSB

## When to choose
- you need Arduino support for classic ATtiny AVR chips not covered by official cores
- you want ISP, serial, or VUSB programming options for tinyAVR devices
- you are maintaining or building projects on legacy ATtiny hardware

## When to avoid
- you are using modern tinyAVR 0/1/2-series chips - use megaTinyCore instead
- you need AVR chips with more features - use DxCore for megaAVR/AVR-Dx parts
- you expect frequent new features - this core is in maintenance mode with only bug fixes

## Facets
- artifact type: library
- maturity: maintenance
- function: embedded, sdk, developer-tools
- domain: embedded-systems, hardware, developer-tools
- platform: embedded, iot, cpp, c
- tags: arduino-core, attiny, avr, microcontroller, isp-programming, optiboot, micronucleus

## Member repositories
- SpenceKonde/ATTinyCore (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:33.953218+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:26:02.530613+00:00, confidence not recorded.
  - readme: https://github.com/SpenceKonde/ATTinyCore (fetched 2026-08-28T04:05:33.953218+00:00, sha 535c01d0f639)
- Data as of 2026-08-30T08:39:29.467469+00:00.