Arduino Board Manager URL / arduino-cli Generator

About this tool

Pick the third-party board cores you need (ESP32, ESP8266, RP2040/Pico, STM32, Adafruit SAMD, Seeeduino) and get either the comma-separated "Additional Boards Manager URLs" line for Arduino IDE's Preferences dialog, or the equivalent arduino-cli commands to add the index and install the core from the command line.

Frequently asked questions

Where do I paste the IDE URL list?

File → Preferences → "Additional boards manager URLs" — paste the whole comma-separated line into that single field, then open Tools → Board → Boards Manager to install the core.

Do these URLs and package names ever change?

They can — third-party maintainers occasionally move index files or rename packages between major versions. If a URL stops working, check the core's GitHub repo or official docs for the current link.

What does arduino-cli core update-index do?

It downloads the latest package index from every configured URL (including the ones you just added) so arduino-cli knows what versions are available — run it once after adding new URLs, before installing.