Components needed:

• 1 Breadboard
• 1 Arduino
• 3 LEDs (Red, green and yellow)
• 1 Ultrasonic sensor HC-SR04
• 1 Buzzer
• 4 resistors (1k)
• Jumper wires (male/male)

Example Videos – Look up Echolocation for Bats and Dolphins

Example Dolphin video https://www.youtube.com/watch?v=PH35b1lKQTo

Bats echolocation https://www.youtube.com/watch?v=laeE4icRYp4

Connect your circuit

Upload your code to the Arduino Board 

you can install the program from arduino.cc