HC-SR04 Alarm
This projects uses a HC-SR04 ultrasonic Module, a LED, a passive buzzer or an active buzzer, a 220 ohm resistor and the arduino uno
This projects uses a HC-SR04 ultrasonic Module, a LED, a passive buzzer or an active buzzer, a 220 ohm resistor and the arduino uno
video of the build: https://www.youtube.com/watch?v=9Vb6XdjTv_8