Introduction: 2 Minute Ultrasonic Alarm
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About: I am robotics engineer and a teacher whose passion in life is breaking down the maths and academic jargon of programming and robotics into something that everyone can understand, primary school kids included.…
The ultrasonic sensor works by sending out sound waves and counting how long it takes for them to come back ( having been reflected from the nearest object.
In this circuit the ultrasonic sensor HC-SR04 plugs straight in to the Arduin, with pins 7 and 4 being used and GND and Vcc. The distance is calculated and every time the distance is less than a given threshold an alarm is raised, thus turning on an LED and a buzzer
Componentsused:
•Arduino Uno
•5mm LED
•Piezo Buzzer
•Ultrasonic Sensor HC-SR04
