int led = 4; // the PWM pin the LED is attached to
int brightness = 0;
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
pinMode(led, OUTPUT);
}
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A1);
// Convert the analog reading (which goes from 0 - 1023) to (0 - 255)
brightness = 255 - sensorValue * 1.06;
// print out the value you read:
Serial.println(brightness);
analogWrite(led, brightness);
}
2. Keyboard to control LEDs. Send 1 to turn on red LED and 2 to turn on green LED
const int redPin = 2;
const int greenPin = 3;
int x = 4;
void setup() {
// initialize serial:
Serial.begin(9600);
// make the pins outputs:
pinMode(redPin, OUTPUT);
pinMode(greenPin, OUTPUT);
}
void loop() {
// if there's any serial available, read it:
while (Serial.available() > 0) {
// look for the next valid integer in incoming serial stream
x = Serial.parseInt();
if (x == 1) {
digitalWrite(redPin, HIGH);
digitalWrite(greenPin, LOW);
}
else if (x == 2) {
digitalWrite(greenPin, HIGH);
digitalWrite(redPin, LOW);
}
Serial.print(x);
}
}
3. Keyboard to control the brightness of an LED. Send brightness value (0-255) from keyboard to control the LED.
// pin for the LED, make sure you use a PWM~ pin
const int ledPin = 6;
int x = 444;
void setup() {
// initialize serial:
Serial.begin(9600);
// make the pins outputs:
pinMode(ledPin, OUTPUT);
}
void loop() {
// if there's any serial available, read it:
while (Serial.available() > 0) {
Serial.println("Enter the brightness of LED between 0 and 255");
// look for the next valid integer in the incoming serial stream:
x = Serial.parseInt();
Serial.println(x);
analogWrite(ledPin, constrain(x, 0, 255));
}
}
