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Welcome to Pi4J

Latest release: V3.0.1 (2025-03-24, see Release Notes).

This project is intended to provide a friendly object-oriented I/O API and implementation libraries for Java Programmers to access the full I/O capabilities of the Raspberry Pi platform. This project abstracts the low-level native integration and interrupt monitoring to enable Java programmers to focus on implementing their application business logic.

If you immediately want to “dive” into Pi4J development, check these resources:

Brief History

The Pi4J Project was started in 2012, the same year the Raspberry Pi was introduced as a tool to provide Java developers a simple and familiar object-oriented interface library to access the low-level I/O capabilities of the Raspberry Pi including GPIO, I2C, SPI, PWM and Serial communications.

The Pi4j project has evolved in all these years as the whole Java eco-system and Raspberry Pi systems have been evolving. This resulted in the following main versions:

Project Mission/Goals

The Pi4J Project’s mission is to provide a rich and powerful, yet simple to use, Java-friendly API library enabling programmatic access to the low-level hardware I/O capabilities of embedded platforms such as the Raspberry Pi.