In fact, if your budget is tight, there's a simple DIY solution: an old smartphone. It's paramount that the phone you use for this is a smart one. Otherwise, you won't be able to access the ...

[Doctor Volt] demonstrates the idea with a 2018 Samsung Galaxy A8, though a wide variety of Android phones can be put to use in this way. The phone is connected to the Arduino via a USB-to-serial ...

Simple phones with more functionality, regular updates and company support can cost $100 or more. A lot of us rely on our phone as a camera, a GPS, a music player and an alarm clock. We use it for ...

I ran into a similar snag one evening at my rock climbing gym. To get in, members use their phones to log in to the gym’s website and generate a temporary bar code that gets scanned at the entrance.