Keyestudio Smart Little Turtle Robot V3 Manual page 74

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(7) Extension Practice：
Let's modify the value of delay and remain the pin unchanged, then
observe how LED changes.
/*
keyestudio smart turtle robot
lesson 2.2
pwm
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*/
int ledPin = 3; // Define the LED pin at D3
void setup () {
pinMode(ledPin, OUTPUT); // initialize ledpin as an output.
}
void loop () {
for (int value = 0; value <255; value = value + 1) {
analogWrite (ledPin, value); // LED lights gradually light up
delay (30); // delay 50MS
}
for (int value = 255; value> 0; value = value-1) {
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