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Learn how to build an Ultrasonic Intruder Alarm using an Arduino Uno and a few off-the-shelf electronic components.
Many applications could use phototransistors, for example, a sunrise alarm clock. Learn how to use a phototransistor to create a Light Activated LED fader?
An M5Stack touch screen can provide a quick and easy user interface. Here, we use it with an Arduino Uno to control the sequencing of an RGB LED.
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