1)When start up, the hardware initializes, the LCD1602 displays the interface we set before.
2)When the Ultrasonic Module detects that the distance is larger than the maximum, the loudspeaker does not alarm.
3)When the Ultrasonic detects the distance is smaller than the maximum, the loudspeaker alarms.
4)Use the ISD1802 Voice Module to change the alarm voice content.
Code for reference：
Step 1: Component lists:
4.1×5V Power Supply
Step 2: Schematic diagram
Step 3: Connect the 5V Power Supply and the GND of the ICStation UNO to the Bread Board.
The red line is for power supply, the black one is for GND.