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RIOT/tests/sys/arduino_analog/arduino-test.sketch

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// Example sketch given in analogWrite documentation
// https://www.arduino.cc/reference/en/language/functions/analog-io/analogwrite/
int ledPin = LED_PIN; // LED connected to digital pin 3 by default
int analogPin = 1; // potentiometer connected to analog pin 1
int val = 0; // variable to store the read value
void setup() {
pinMode(ledPin, OUTPUT); // sets the pin as output
}
void loop() {
val = analogRead(analogPin); // read the input pin
analogWrite(ledPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255
}