In addition to the adjustable LED level suggested in the lab notes, I decided to program the Arduino board to gradually fade the LED level down from the level set by the potentiometer. Last week when I was working on my game of catch I wanted to have the first LED gently fade in and out during the “wind-up” phase of the throw. This week, I figured out how to do it.
/* PWM Lab
I've added my own twist to the code to make the the LED fade
Michael Chladil
*/
#define ANALOG_INPUT 0
#define PWM_OUTPUT 9
#define DELAY_TIME 10
int potValue = 0;
long lastMillis = 0;
int currentLEDLevel = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
potValue = analogRead (ANALOG_INPUT);
Serial.println (potValue);
/* Use the value read from the potentiometer to determine
a starting level for the LED. */
for (currentLEDLevel = potValue; currentLEDLevel >= 0; currentLEDLevel--)
{
analogWrite(PWM_OUTPUT, currentLEDLevel);
delay (DELAY_TIME);
}
delay (DELAY_TIME);
}