Medidor de parpadeo de luz

Sensor

• Texas Instruments OPT101 Hoja de Datos

Codigo

#include "I2C_LCD.h"

const int COLLECTION_MS = 200;
const int SENSOR_LIMIT = 850;

I2C_LCD lcd(39);

void setup() {
  Wire.begin();
  Wire.setClock(100000);
  lcd.begin(16, 2);
}

void loop() {
  int x_max = 0, x_min = 10000;
  unsigned long stop_ms = millis() + COLLECTION_MS;
  while (millis() < stop_ms) {
    int x = analogRead(A0);
    if (x > x_max) x_max = x;
    if (x < x_min) x_min = x;
  }

  lcd.clear();

  if (x_max > SENSOR_LIMIT) {
    lcd.center(1, "demasiada luz");
  } else {
    float ratio = (float)x_min / x_max;
    lcd.center(0, ("ratio = " + String(ratio)).c_str());
  }
}