Yes, you could use a tennis ball but who doesn't like things that light up?! For real, this is a great way to help you park in tight spaces.
Project showcase by MrBancroft
Now you don't have to remember any of your passwords, and they are still safe and ready to use!
Project showcase by mPelectronic
Make a fully-functioning CNC machine that can accept different tools for less than $150 by using parts from DFRobot and Banggood.
Project tutorial by Arduino “having11” Guy
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