Apart from these new chapters, other updates have taken place:
- The Fourth Edition is written for version 2.0 of the IDE.
- Installation of the IDE is now easier, and instructions for Linux have been included.
- The appendix now includes an overview of all Arduino families, boards, and footprints, and a selection guide.
- The chapter on the Leonardo has been replaced with a chapter on the updated Arduino Cloud service, including the IoT Cloud and Project Hub.
- In order to treat all humans with respect, we have made changes to the nomenclature:
- SPI signal names now follow the Open Source Hardware resolution at oshwa.org/a-resolution-to-redefine-spi-signal-names/
- Connector types are now either pin or socket.
In keeping with the spirit of the original text, British spelling is used throughout.
Over the editions, illustrations have been changed and new ones added. The authors acknowledge the contributions of Elisa Canducci who did the illustrations in the First and Second Editions, Judy Aime’ Castro who revised some existing illustrations and added many new ones in the Third Edition.