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Supported IDE versions

ATtinyCore (Universal) works with all versions of the official IDE (from ) from version 1.6.3 onwards. For board manager installation, 1.6.4 or later is required. Due to serious bugs, 1.6.6, 1.6.7, 1.6.8, and 1.6.10 are not recommended. Version 1.8.3 is recommended.

Board Manager Installation

This core can be installed using the board manager. The board manager URL is:

  1. File -> Preferences, enter the above URL in "Additional Board Manager URLs"
  2. Tools -> Boards -> Board Manager... *If using 1.6.6, close board manager and re-open it (see below)
  3. Select ATtinyCore (Universal) and click "Install".

Due to a bug in 1.6.6 of the Arduino IDE, new board manager entries are not visible the first time Board Manager is opened after adding a new board manager URL.

Manual Installation

Option 1: Download the .zip, extract, and place in the hardware folder inside arduino in your documents folder. (if there is no (documents)/arduino/hardware, create it)

Option 2: Download the github client, and sync this repo to (documents)/arduino/hardware.

core installation