CONCEPT

The concept of this setup is to notify when an object is approaching at different distant points LED lights will notify how close the object is by turning off individual light which are set at specific distance, as the object is closer to the desired point. As soon as it reaches the desired point LED’s will turn off and an alert beep will start making noise. It could also  be used for water levels, when it reaches the desired point an alarm will start beeping due to the ultrasonic sensors.

BILL OF MATERIALS

SCHEMATIC

Start with the ultrasound indicator Connect ground to ground 
Vcc to 5v 
Trig to digital pwm-11
Echo to digital pwm-12
Buzz positive to 7 and Negative to ground 
Connect LED pins with its respective resistors of 220 and the positive leg of the resistor to 2-6 digital pwm

PROTOTYPE

No object detected
Object close to the aim point
sound alarm ,detection of object

CODE

VIDEO

NEXT STEP

This set up can detect the approach of an object or person to start a rhythmic melody by motion detection on a sensorial walk or in museums to begin with an explanation on a gallery.