UltraSonic Proximity Alarm
This is a quick and easy guide on how to make a proximity alarm using a HC-SR04 Ultrasonic sensor, Arduino UNO, Arduino breadboard, and a 6V DC buzzer. This sensor will beep as an object move closer. Materials Needed (1x) Arduino UNO(1x) Breadboard (please note: any breadboard will work. the abo...By: SMART KARL
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