Fading a LED

Code:

• In the main loop of your code, the "analogWrite()" function requires two arguments: the pin number to write to and the PWM value to be written.

• To fade the LED on and off, the (PWM) value is gradually increased from 0 (completely off) to 255 (fully on), and then decreased back to 0 to complete the cycle. In the sketch, this is achieved by adjusting a variable called "brightness" within the loop, where it increments by the value of "fadeAmount" with each iteration.

• When the "brightness" variable reaches either extreme (0 or 255), the "fadeAmount" variable changes its sign. For example, if "fadeAmount" is 5, it becomes -5, and vice versa. This change in "fadeAmount" reverses the direction of the "brightness" change in the next iteration of the loop.

• The speed of the fading effect can be adjusted by modifying the delay value at the end of the sketch after using the "analogWrite()" function to change the PWM value rapidly. Experiment with different delay settings to observe variations in the fading effect.

1. // the setup function runs once when you press reset or power the board

2. void setup() 

3. {

4.   pinMode(LED_BUILTIN, OUTPUT);

5. }

6. 
   

7. // the loop function runs over and over again forever

8. void loop() 

9. {

10.   digitalWrite(LED_BUILTIN, HIGH);        // turn the LED on (HIGH is the voltage level)

11.   delay(10);                                                 // wait for a second

12.   digitalWrite(LED_BUILTIN, LOW);        // turn the LED off by making the voltage LOW

13.   delay(10);                                                // wait for a second

14. }

• If you have completed this successfully, move on to the next step.

    3) Servo