Code snippets for blog

dht11-test.ino

/* Code testing out the DHT11 Temperature and Humidity sensor */

#include "DHT.h"

#define DHTPIN 2

#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  float h, t, hic;
  delay(2000);
  h = dht.readHumidity();
  t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println("Error: Cannot connect to sensor.");
    return;
  }
  hic = dht.computeHeatIndex(t, h, false);
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println("%");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.println(" *C\n");
}

moisture-sensor-test.ino

/* Test out the moisture sensor */

void setup () {
  Serial.begin(9600);
  Serial.flush();
}

void loop () {
  int val;
  Serial.print(F("Moisture sensor value: "));
  val = analogRead(A0);
  Serial.println(val);
  if (val <= 300) {
    Serial.println(F("Dry soil"));
  } else if (val <= 700) {
    Serial.println(F("Humid soil"));
  } else if (val <= 950) {
    Serial.println(F("In water..."));
  }

  delay(1000);
}