In this program why do you need to divide the signal coming from the analog inpu

Question

In this program why do you need to divide the signal coming from the analog input by four before sending it out to the analog output pin?

/* Type the command to start the serial communications with a

Serial.begin command here. YOU DO THIS.*/

} void loop(){

pos_int = analogRead(A0); /*Here, read the analog voltage

applied to analog input 0.*/

Serial.print("The analog input is ");

Serial.print(pos_int);

Serial.println(".");

/*Next, write the position from the pot. to the led pin.*/

ana_volt = pos_int/4; analogWrite(led, ana_volt);

}

Explanation / Answer

I think the amplitude of the imcoming analog signal is higher than what is required for the led_pin because led usually requires 2 volts. To decrease the amplitude of the signal so that the led can be operated safely we have divided the incoming signal by 4.

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