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I am very interested in your project.
I noticed that there seems to be a delay of about 8 microseconds between the sender and the echo.
Could you please confirm if this is correct?

But Y axis keeps autoscaling. Please help.

Here is the complete program.
/*
ReadAnalogVoltage
Center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
modified by yours truly, Dr. G
*/
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// Convert the analog reading (which goes from 0 – 1023) to a voltage (0 – 5V):
float voltage = sensorValue * (5.0 / 1050.0);
// print out the value of the potentiometer as an interger only:

Serial.print(“5, “);
Serial.print(“0, “);
float pi = 3.14;
int value = (int)pi;
Serial.print(“voltage:”);
Serial.println(voltage,0);
delay(200); // delay in between reads for stability
}

But the Y axis keeps autoscaling. Please help. Copied below is the whole program

/*
ReadAnalogVoltage
Center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
modified by yours truly, Dr. G
*/
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// Convert the analog reading (which goes from 0 – 1023) to a voltage (0 – 5V):
float voltage = sensorValue * (5.0 / 1050.0);
// print out the value of the potentiometer as an interger only:

Serial.print(“5, “);
Serial.print(“0, “);
float pi = 3.14;
int value = (int)pi;
Serial.print(“voltage:”);
Serial.println(voltage,0);
delay(200); // delay in between reads for stability
}