Proyecto 8

Proyecto 8a - Termistor NTC 103

Construir un divisor de tensión para sacar la señal analógica del termistor 103.

Su variación la sacaremos visualmente mediante un servo.

Esquema

Sketch

#include <Servo.h>

long duration, distance,dec;

Servo servo1;

void setup() {

  Serial.begin (9600);

  servo1.attach(3);

}

void loop() {

  int sensorValue = analogRead(A0);

  Serial.println(sensorValue);

  dec= 2*(sensorValue - 150);

  servo1.write(dec);

  delay(100);

}

Proyecto 8b - DHT11 - Sensor de Temperatura y Humedad

Obtener  el valor de la humedad y temperatura ambiente mediante el sensor DHT11.

Una vez introducido el código abrir el Monitor Serial para ver el resultado.

DHT11 Datasheet

• Ultra low cost

• 3 to 5V power and I/O

• 2.5mA max current use during conversion (while requesting data)

• Good for 20-80% humidity readings with 5% accuracy

• Good for 0-50°C temperature readings ±2°C accuracy

• No more than 1 Hz sampling rate (once every second)

• Body size 15.5mm x 12mm x 5.5mm

• 4 pins with 0.1" spacing

Esquema

Sketch

// Example testing sketch for various DHT humidity/temperature sensors

// Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN 3     // what pin we're connected to

// Uncomment whatever type you're using!

#define DHTTYPE DHT11   // DHT 11

//#define DHTTYPE DHT22   // DHT 22  (AM2302)

//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 4 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the

// sensor

DHT dht(DHTPIN, DHTTYPE);

void setup() {

  Serial.begin(9600);

  Serial.println("DHTxx test!");

  dht.begin();

}

void loop() {

  // 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();

  float t = dht.readTemperature();

  // check if returns are valid, if they are NaN (not a number) then something went wrong!

  if (isnan(t) || isnan(h)) {

    Serial.println("Failed to read from DHT");

  } else {

    Serial.print("Humidity: ");

    Serial.print(h);

    Serial.print(" %\t");

    Serial.print("Temperature: ");

    Serial.print(t);

    Serial.println(" *C");

  }

}

Links

http://www.thinkbit.org/practica-8/

https://learn.adafruit.com/dht/overview

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