1. What you will build
Create a security alarm that triggers when someone gets too close, using an ultrasonic sensor.
Guided tutorial
Ultrasonic Distance Alarm
Create a security alarm that triggers when someone gets too close, using an ultrasonic sensor.
intermediate · 25 Sept 2026
Difficulty
intermediate
Learning complexity
Sections
6
Structured content blocks
Topics
8
Linked learning concepts
Related links
6
Next steps and references
2. Wire Ultrasonic
Connect HC-SR04 trigger to pin 9, echo to pin 10.
3. Add LCD
Wire I2C LCD to show distance in real-time.
4. Add Buzzer
Connect piezo buzzer for audio alarm.
5. Threshold Control
Use potentiometer to set alarm distance.
6. Beep Rate
Make beep frequency increase as object gets closer.
FAQ
Can I try Ultrasonic Distance Alarm in the simulator?
Yes. Use the Open in Lab action to load the guided build in the browser-based simulator.
Next step
Open this tutorial in the lab
Load the guided build in Ayantrik Lab and follow the same components and steps inside the simulator.