I used tinkercad for simulating the circuit

and build the code blocks 

input : the ultrasonic sensor takes the distance as the input 

actions : 

• the blinking led 

• the baabing buzzer

the design starts with thinking about the purpose of the system 

I need it to make an obvious signal 

so I need the busser and the led to make pulses 

so, I need to connect it with arduino to control it 

first open tinker cad and get the arduino and breadboard and conect the 5v and ground

here is the simulation

after doing the simulation 

I started the wiring as the simulation 

the line on the right has the VCC and Ground 

connected the ground and the vcc of the ultrasonic sensor 

and the pins to the arduino 

resistor from the ground to the cathode of the led
and connect the anode to the arduino pin 

same for the buzzer connected it directly to the ground and the positive to the arduino

then copied the code into arduino IDE

and uploaded the code to the arduino

and voilà  it worked

 I got stuck at first because the lm35 sensor in real life wasn't reading anything but -49

at first I wanted the project to be fire indicator .

I connected it wrongly which resulted in its malfunction 

then to make sure I tested it with a multimeter.
but I learned how to test this sensor using the multimeter from    the video
and discovered it was malfunctioning.

but ,you know plans change

so I decided to make it as motion detector 

mastering the ultrasonic usage and linking between the inputs and outputs