/* Map an analog value to 8 bits (0 to 255) */
void setup() {}
void loop()
{
int val = analogRead(0);
val = map(val, 0, 1023, 0, 255);
analogWrite(9, val);
}
trying to use pwm instead of a analog pot. The arduino will be connected instead of the three wires(i'am using only 2 G and S) and I will have a infrared receiver and when I send an signal to the mcu,it will adjust the signal and since pwm is 255 and analog is 1023 if I type pwm*4
in the loop will it work(I don't want my computer crashing)?
if this is a standard audio amplifier your trying to modify then you will need to either motorize the current POT as described by Michael K above. or you could replace the POT with an equivalent digital POT and use the Arduino to control that .
the reason your approach wont work on a standard amp is because the actual audio is passing through the POT and being reduced in size by a resistor divider network consisting of the length of the pot and where the slider is. so you cant simply replace it with a PWM signal to manage the volume.
if it is not a standard amp then we would need far more details to be able to help. Make, Model of the amp, Pictures of the POT and its wireing etc.
