aquarium_thermostat

aquarium_thermostat.ino

/*
Date: January 2014
Author: Adam Petrone
Aquarium Thermostat
*/

#include <Wire.h>
#include <LiquidCrystal.h>
#include <TinyDHT.h>
#include <OneWire.h>
#include <DallasTemperature.h>

const uint8_t WATER_SENSOR_PIN = 7;
const uint8_t AMBIENT_SENSOR_PIN = 8;

// Data / Clock pins for i2c
// Leonardo: 2, 3
LiquidCrystal lcd(0);

OneWire ow(WATER_SENSOR_PIN);
DallasTemperature sensors(&ow);
DeviceAddress tempSensor;

DHT dht(AMBIENT_SENSOR_PIN, DHT22);
long last_millis = 0;
long next_sensor_check = 2000;
uint16_t temp = 0;

void setup()
{
  sensors.begin();
  dht.begin();
  
  lcd.begin(16, 2);
  lcd.setBacklight(HIGH);
  lcd.print("initializing...");
  delay(500);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Ambient    Water");  
}

void loop()
{
  int sensor_value = analogRead(WATER_SENSOR_PIN);
  // 10 to 1000
  int output = map(sensor_value, 0, 1023, 10, 1000);

  long delta_millis = millis() - last_millis;
  next_sensor_check -= delta_millis;
  last_millis = millis();
  
  if (next_sensor_check <= 0)
  {
    next_sensor_check = 2000;
    temp = dht.readTemperature(1);
  }

  {
    sensors.requestTemperatures();
    
    float value = sensors.getTempFByIndex(0);
    lcd.setCursor(0,1);
    lcd.print(temp);
    lcd.print("F");
    
    lcd.setCursor(10,1);
    lcd.print(value);
    lcd.print("F");
  }
}