In this tutorial, you will build a Customer Greeting Robot that welcomes visitors using an LED matrix display, audio playback, and distance sensing. This robot uses the following components:
Arduino Nano (main controller)
DFPlayer Mini (plays MP3 audio files)
LED Matrix (displays welcome messages)
SRF05 Ultrasonic Sensor (detects nearby people)
Voltage Buck Converter (powers the circuit safely)
When a customer approaches, the ultrasonic sensor detects them. Then, the robot plays a greeting audio .