![]() ![]() ![]() ![]() ![]() How the Program WorksĪt the beginning of the program, brightness is set equal to 0: int brightness = 0 In the body of the if statement we have fadeAmount = -fadeAmount. Then we have an if statement with a condition that says “if brightness is less than or equal to 0, or brightness is greater than or equal to 255″, execute the code in the body. We declared fadeAmount equal to 5, so this will make the brightness variable increase by 5 with each cycle of the loop. This takes the brightness variable and adds the fadeAmount variable to it each time through the loop. The next line is brightness = brightness + fadeAmount. We declared a variable called brightness to store that value, so it’s used as the second argument. The second argument is the analogWrite value that sets the duty cycle. The first argument is the pin number that will generate the pulse width modulation signal, so we use the ledPin variable as the first argument. In the loop() section, we have an analogWrite() function to generate the pulse width modulation signal. In the setup() section, we use the pinMode() function to set the ledPin as an output. We also declare a variable called fadeAmount, which will be used to control how quickly the LED fades on and off. Then we declare an int variable called brightness, which will store the analogWrite values as they cycle between 0 and 255. Once the circuit is connected, upload this code to the Arduino: int ledPin = 6 Īt the top of the sketch, we declare an int variable called ledPin to store the pin number connected to the LED. This program will make the LED increase to 100% brightness then decrease to 0% brightness, in an infinite loop. Programming the Arduino for Pulse Width Modulation The current limiting resistor can have any value from 220 Ohms to 1K Ohms. ![]()
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