olha lá, esse receptor não tem filtro para luz visivel... faz como te disseram e mete fita preta a volta...
depois podes experimentar isto
/*
*****************************************************
AnalogRead exemple by AcidDagger for Lusorobotica.com
*****************************************************
*/
const int greenled = 10;
const int redled = 11;
const int sensor = 5;
const int x = 100;
void setup() {
pinMode(greenled, OUTPUT);
pinMode(redled, OUTPUT);
pinMode(sensor, INPUT);
Serial.begin(9600);
}
void loop() {
int analogValue = analogRead(sensor);
if (analogValue > x) {
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
delay(100);
}
else {
digitalWrite(greenled, LOW);
digitalWrite(redled, HIGH);
delay(100);
}
Serial.println(analogValue, DEC);
}
