It's important to us that the information we've presented in Practical Arduino is correct.
Each of the project pages on this site has an "Errata" section near the bottom that lists any known issues with that particular project.
If you find any problems with anything we've described in the book we'd love to hear from you so we can update the project pages and submit corrections to Apress for future editions. You can submit corrections to us via email at:
Apress also maintain an errata page for the book and if you prefer to submit issues to them you can certainly do so. However, issues submitted to Apress may be handled internally by them and we (Jonathan and Hugh) may never see them. The fastest and most direct way to contact us with corrections is using the email address above.