PLEASE help "beginner"

Projects Programming
1

Please help me, i want to change my analog value to a distance of cm reading for my ir sensor 4cm-30cm range :sob: :sob:

here is my code :-\

int sensorpin = 0; // analog pin used to connect the sharp sensor
int val = 0; // variable to store the values from sensor(initially zero)

void setup()
{
Serial.begin(9600); // starts the serial monitor
}

void loop()
{

val = analogRead(sensorpin); // reads the value of the sharp sensor
Serial.println(val); // prints the value of the sensor to the serial monitor
delay(600); // wait for this much time before printing next value
}

Thank you :sob:

2

There's no way we can guess the characteristics of your IR sensor - the sensor's documentation should state how to convert the value you are reading to physical units.

3

You need to do a simple calibration exercise.

What val do you see when your sensor is at 4cm?

What val do you see when your sensor is at 30cm?

Then (assuming the relationship is linear) you can use the map() function to convert from val to distance.