For those starting out in Arduino, there are tons of resources to get better acquainted with the community and the types of projects you can tinker with.
While iPhones don't have the customization options of Android, it's far from unchangeable. These apps will let you pick custom wallpaper, icons, and more.
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If you've got an Arduino of any variety, you might have noticed some of the pins on the board have a tilde mark or PWM printed next to them. What is PWM?
Not only does your phone have a great camera, but it also has enough power to perform some advanced editing techniques, like removing backgrounds from photos.