diff --git a/sketch_lcd/sketch_lcd.ino b/sketch_lcd/sketch_lcd.ino
index c25a7a3..baa7257 100644
--- a/sketch_lcd/sketch_lcd.ino
+++ b/sketch_lcd/sketch_lcd.ino
@@ -11,40 +11,57 @@ http://howtomechatronics.com/tutorials/arduino/lcd-tutorial/
 DHT (temp & hum)
 
 https://github.com/adafruit/DHT-sensor-library/blob/master/examples/DHTtester/DHTtester.ino
+
+Photoresistor
+https://learn.adafruit.com/photocells/using-a-photocell
+https://arduinodiy.wordpress.com/2013/11/03/measuring-light-with-an-arduino/
 */
 
 #include <DHT.h>
 #include <LiquidCrystal.h>
 
-#define LED_Pin 13 // Pin del led de la placa
 #define DHT_APin A0 // Pin Análogico al que he conectado el sensor de temperatura
 #define DHT_Type DHT22 // mi sensor es el DHT11
-//#define PHOTORES_APin 3 // Pin Análogico al que he conectado el sensor de luz
+#define PHOTORES_APin A2 // Pin Análogico al que he conectado el sensor de luz
 
 // init
 DHT dht(DHT_APin, DHT_Type);
 LiquidCrystal lcd(9, 10, 4, 5, 6, 7); // syntax: LiquidCrystal(rs, enable, d4, d5, d6, d7)
 
 int timer = 0;
-int interval = 60;
-//int luz;
+int milis = 0;
+int ticks = 0;
+int tmp = 0;
+int loops = 0;
+int luzMin = 1024; // máximo de lectura para el sensor
+int luzMax = 0;
+long luzSum = 0; // value use to exceed INT
+
 
 void setup() { // put your setup code here, to run once:
 	Serial.begin(9600);
 	dht.begin();
 	lcd.begin(16, 2);
 
-	pinMode(LED_Pin, OUTPUT);
-	//pinMode(PHOTORES_APin, INPUT);
-
-	lcd.print("  hue hue hue");
-
+	lcd.print("  hue hue hue   ");
 }
 
-void loop() { // put your main code here, to run repeatedly:
-	timer--;
 
-	if (timer <= 0) {
+void loop() { // put your main code here, to run repeatedly:
+	timer = 59 - ((millis() / 1000) % 60);
+	if (timer == ticks) {
+		return;
+	}
+
+	ticks = timer;
+	loops++;
+
+	tmp = analogRead(PHOTORES_APin);
+	luzMin = min(luzMin, tmp);
+	luzMax = max(luzMax, tmp);
+	luzSum += tmp;
+
+	if (timer == 59) {
 		// Reading temperature or humidity takes about 250 milliseconds!
 		// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
 		float h = dht.readHumidity();
@@ -58,7 +75,6 @@ void loop() { // put your main code here, to run repeatedly:
 		// Compute heat index in Celsius (isFahreheit = false)
 		float hic = dht.computeHeatIndex(t, h, false); // sensación térmica
 
-		//luz = digitalRead(PHOTORES_APin);
 
 		// D = DHT, para el script en python que leerá esto
 		Serial.print("D h:");
@@ -67,8 +83,12 @@ void loop() { // put your main code here, to run repeatedly:
 		Serial.print(t);
 		Serial.print(" i:");
 		Serial.print(hic);
-		//Serial.print(" l:");
-		//Serial.print(luz);
+		Serial.print(" la:");
+		Serial.print(luzSum/loops);
+		Serial.print(" ln:");
+		Serial.print(luzMin);
+		Serial.print(" lx:");
+		Serial.print(luzMax);
 		Serial.println("");
 
 		lcd.clear();
@@ -83,14 +103,40 @@ void loop() { // put your main code here, to run repeatedly:
 		digitalWrite(13, HIGH);
 		delay(100);
 		digitalWrite(13, LOW);
-		//delay(60000); // 1 minuto
 
-		timer = interval;
+		// reset counters
+		loops = 0;
+		luzMin = 1024;
+		luzMax = 0;
+		luzSum = 0;
 	}
 
+	lcd.setCursor(10, 2);
+	lcd.print(tmp);
+
 	lcd.setCursor(14, 2);
 	if (timer < 10)
 		lcd.print(0);
 	lcd.print(timer);
-	delay(1000);
+
+	delay(100);
 }
+
+
+/* Not used now
+double Lux(int RawADC0) {
+	double Vout = RawADC0 * 0.0048828125;
+	//int lux=500/(10*((5-Vout)/Vout));//use this equation if the LDR is in the upper part of the divider
+	int lux = (2500 / Vout-500) / 10;
+	return lux;
+}
+*/
+
+/* GRAFANA: 
+SELECT (2500 / (mean("avg") * 0.0048828125) - 500) / 10, 
+       (2500 / (min("min") * 0.0048828125) - 500) / 10, 
+       (2500 / (max("max") * 0.0048828125) - 500) / 10 
+FROM "luminosidad" 
+WHERE $timeFilter 
+GROUP BY time(2m)
+*/
\ No newline at end of file