I found great page with arduino project that Im looking for. I will need to change some lines and add extra sensor but can you please help me to display in Celsius and not in Fahrenheit on LCD?
Is it possible to do that, because i change from: (DallasTemperature::toFahrenheit(tempC)) to (DallasTemperature::toCelsius(tempC)) and the temperature on LCD is not correct :~
A add correct addresses from DS18B20 so that is not a problem and I have pul-up resistor 4,7kohm.
The whole code is:
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal.h>
// Connections:
// rs (LCD pin 4) to Arduino pin 12
// rw (LCD pin 5) to Arduino pin 11
// enable (LCD pin 6) to Arduino pin 10
// LCD pin 15 to Arduino pin 13
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);
int tank1BLED = 37;
int tank1GLED = 39;
int tank1RLED = 41;
int tank2BLED = 43;
int tank2GLED = 45;
int tank2RLED = 47;
// Data wire is plugged into pin 8 on the Arduino
#define ONE_WIRE_BUS 8
// Setup a oneWire instance to
//communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
// Assign the addresses of your 1-Wire temp sensors.
DeviceAddress tank2Thermometer = { 0x28, 0x46, 0x3C, 0x16, 0x03, 0x00, 0x00, 0xA9 };
DeviceAddress tank1Thermometer = { 0x28, 0xDF, 0x21, 0x16, 0x03, 0x00, 0x00, 0x1E };
int tank1 = 31; // heater control pins
int tank2 = 33; // heater control pins
float tank1temp = 0;
float tank2temp = 0;
void setup(void)
{
// Start up the library
sensors.begin();
// set the resolution to 10 bit (good enough?)
sensors.setResolution(tank1Thermometer, 10);
sensors.setResolution(tank2Thermometer, 10);
pinMode(tank1BLED, OUTPUT); // Tank LED's
pinMode(tank1GLED, OUTPUT);
pinMode(tank1RLED, OUTPUT);
pinMode(tank2BLED, OUTPUT);
pinMode(tank2GLED, OUTPUT);
pinMode(tank2RLED, OUTPUT);
digitalWrite(tank1BLED, HIGH); // set Tank LED's off
digitalWrite(tank1GLED, HIGH);
digitalWrite(tank1RLED, HIGH);
digitalWrite(tank2BLED, HIGH);
digitalWrite(tank2GLED, HIGH);
digitalWrite(tank2RLED, HIGH);
lcd.begin(20,4);
// columns, rows. use 16,2 for a 16x2 LCD, etc.
lcd.clear();
// start with a blank screen
pinMode(tank1, OUTPUT); // Tank heaters
pinMode(tank2, OUTPUT);
}
void printTemperature(DeviceAddress deviceAddress)
{
float tempC = sensors.getTempC(deviceAddress);
float t1tempC = sensors.getTempC(tank1Thermometer);
float t2tempC = sensors.getTempC(tank2Thermometer);
if (tempC == -127.00) {
lcd.print("Error");
} else {
// lcd.print(tempC);
// lcd.print("/");
tank1temp = (DallasTemperature::toFahrenheit(t1tempC));
tank2temp = (DallasTemperature::toFahrenheit(t2tempC));
lcd.print(DallasTemperature::toFahrenheit(tempC));
}
}
void loop(void)
{
delay(2000);
sensors.requestTemperatures();
lcd.setCursor(0,0);
lcd.print("Tank 1: ");
printTemperature(tank1Thermometer);
lcd.setCursor(0,1);
lcd.print("Tank 2: ");
printTemperature(tank2Thermometer);
if (tank1temp <=178.9)
{
digitalWrite(tank1, HIGH);
digitalWrite(tank1BLED, LOW);
digitalWrite(tank1GLED, HIGH);
digitalWrite(tank1RLED, HIGH);
}
if (tank1temp >= 179 && tank1temp <= 181.9)
{
digitalWrite(tank1GLED, LOW);
digitalWrite(tank1RLED, HIGH);
digitalWrite(tank1BLED, HIGH);
}
if (tank1temp >= 182)
{
digitalWrite(tank1, LOW);
digitalWrite(tank1RLED, LOW);
digitalWrite(tank1GLED, HIGH);
digitalWrite(tank1BLED, HIGH);
}
if (tank2temp <=178.9)
{
digitalWrite(tank2, HIGH);
digitalWrite(tank2BLED, LOW);
digitalWrite(tank2GLED, HIGH);
digitalWrite(tank2RLED, HIGH);
}
if (tank2temp >= 179 && tank2temp <= 181.9)
{
digitalWrite(tank2GLED, LOW);
digitalWrite(tank2RLED, HIGH);
digitalWrite(tank2BLED, HIGH);
}
if (tank2temp >= 182)
{
digitalWrite(tank2, LOW);
digitalWrite(tank2RLED, LOW);
digitalWrite(tank2GLED, HIGH);
digitalWrite(tank2BLED, HIGH);
}
}
Original author: Arduino Your Home & Environment: 5/1/11 - 5/8/11