There is no better way to learn electronics and robotics than building your own gadgets. AlexGyver’s robotized trash can project seems quite interesting. It is a robot trash can that opens its cap when your hand is close enough. It stays open for 3 seconds if your hand is within 70 centimeters.
More like this ➡️ here
DIY robot trashcan
You are going to need an Arduino Nano, range sensor, and sensor to get started.
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