I  will use an app. called  Arduino Blue Control from app store to control the LED and the light.

which reads a signal from the (sensor).

The Arduino UNO Connection

The 5 Volts with a positive N in the bread-board

The ground with the negative N  in the bread-board

The Sensor Connections

The Bluetooth Sensor

VCC  to the positive on the bread-board

Ground to negative N in bread-board

TXD to RXD of the Arduino.

RXD to TXD of the Arduino.

Note: The resistors connected to the RX pins are to convert 5v to 3.3VDC. As RX pin works on 3 Volts .

LED

The positive leg to 9 on Arduino 

The negative leg to resistor to the negative  N on bread-board

Buzzer

The orange wire will be connected to 8 on Arduino

the red to the positive on bread-board

while the brown is to the negative on bread-board

Click here to download the Arduino file

( I used Chat-GPT for the code)

For searching in Chat-GPT (Prompt):

I wrote: as an Arduino expert write a code for an Arduino that turn on a buzzer and a LED.

First we have to define Character:

char cache;

String inputString="";

Then Void:

We have to choose the output pins(pin 8 and pin 9)

void setup()

{

Serial.begin(9600);

pinMode(9,OUTPUT);

pinMode(8,OUTPUT);

}

Finally Void Loop:

We have to tell if we press1, so make a voice and turn on LED

If we press 2, make no voice or illumination

choose if condition for 1 

else if condition for 2

void loop()

{

if(Serial.available())

{

while(Serial.available())

{

char inChar = (char)Serial.read();

inputString += inChar;

}

Serial.println(inputString);

while (Serial.available()>0)

{

cache = Serial.read();

}

if(inputString == "1")

{

digitalWrite(9,HIGH);

digitalWrite(8,HIGH);

}

else if(inputString == "2")

{

digitalWrite(9,LOW);

digitalWrite(8,LOW);

}

inputString = "";

}

}

Then I tested the code on Arduino app.

Click here to download the Arduino file

( I used Chat-GPT for the code)

For searching in Chat-GPT 

I wrote: as an Arduino expert write a code for an Arduino that turn on a buzzer and a LED.

then I tested the code on Arduino app.

When I press A it is not working  it is only working using 1 and 2 but terminal is not preferred to kids.

so I changed the code when I press "A" LED and buzzer will turn on 

while "B" will turn off them.