Arduino Temperature Display V1

A functional and accurate project that is perfect for beginners, and displays the current temperature and light levels.

Jul 27, 2022

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weather

environmental sensing

Devices & Components

Arduino Uno Rev3

M/M Jumper Leads

Mini Breadboard

I2C LCD

4.7k resistor

LDR Module

DS18B20

Software & Tools

Arduino IDE

Project description

Code

TemperatureDisplay.ino

arduino

This is the code for the temperature display.

1#include <OneWire.h>                       // library to access DS18B20
2#include   <DallasTemperature.h>             // library to support DS18B20
3#include <Wire.h>                           // library for communicating to I2C devices
4#include   <hd44780.h>                       // main hd44780 library
5#include <hd44780ioClass/hd44780_I2Cexp.h>   // i2c expander i/o class library
6
7hd44780_I2Cexp lcd; // declare lcd object:   auto locate & auto configure expander chip
8
9OneWire oneWire(2); // tell the   library to use the digital pin the DS18B20 is connected to
10
11DallasTemperature   sensors(&oneWire); // tell the library to compute temp on the oneWire pin
12
13int   IOL; // initialize the LDR pin name as a 16-bit value
14
15void setup() {
16   Serial.begin(9600); // setup Serial for debug
17  sensors.begin(); // start DS18B20
18   IOL = analogRead(A0); // initialize LDR as analog pin 0 - read only
19  lcd.begin(16,   2); // initialize lcd as 16 columns, 2 rows
20  lcd.clear(); // clear any old data   on the lcd
21  // if there is lots of ambient light, turn on the lcd backlight
22   if (IOL < 500) {
23    lcd.backlight();
24  }
25  // if the ambient light is   low, turn off the backlight
26  if (IOL >= 500) {
27    lcd.noBacklight();
28   }
29}
30
31void loop() {
32  IOL = analogRead(A0); // initialize LDR as analog   pin 0 - read only
33  // if there is lots of ambient light, turn on the lcd backlight
34   if (IOL < 500) {
35    lcd.backlight();
36  }
37  // if the ambient light is   low, turn off the backlight
38  if (IOL >= 500) {
39    lcd.noBacklight();
40   }
41
42  sensors.requestTemperatures(); // send data asking for temperature   to DS18B20
43  lcd.setCursor(0, 0); // set the lcd cursor for celsius temperature
44   lcd.print("Temp C: "); // print explanation of following data
45  lcd.print(sensors.getTempCByIndex(0));   // print the degrees in celsius
46  lcd.print("       "); // print spaces to   blank out any remanants of data
47  lcd.setCursor(0, 1); // set the lcd for farenheit   temperature
48  lcd.print("Temp F: "); // print explanation of following data
49   lcd.print(DallasTemperature::toFahrenheit(sensors.getTempCByIndex(0))); // Convert   tempC to Fahrenheit and print it
50  lcd.print("       "); // print spaces to   blank out any remanants of data
51
52/*
53  sensors.requestTemperatures(); //   send data asking for temperature to DS18B20
54  lcd.setCursor(0, 0); // set the   lcd cursor for celsius temperature
55  lcd.print(F("Temp: ")); // print explanation   of following data from program storage
56  lcd.print(sensors.getTempCByIndex(0));   // print the degrees in celsius
57  lcd.print(F(" ")); // print space from program   storage
58  lcd.print((char)223); // print degrees symbol
59  lcd.print(F("C"));   // print celsius abbreviation
60  lcd.print("       "); // print spaces to blank   out any remanants of data
61  lcd.setCursor(0, 1); // set the lcd for light levels
62   lcd.print(F("Light Level: ")); // print explanation of following data
63  lcd.print(IOL);   // print light levels
64  lcd.print("       "); // print spaces to blank out   any remanants of data
65*/
66}
67

#include <OneWire.h>                       // library to access DS18B20
#include   <DallasTemperature.h>             // library to support DS18B20
#include <Wire.h>                           // library for communicating to I2C devices
#include   <hd44780.h>                       // main hd44780 library
#include <hd44780ioClass/hd44780_I2Cexp.h>   // i2c expander i/o class library

hd44780_I2Cexp lcd; // declare lcd object:   auto locate & auto configure expander chip

OneWire oneWire(2); // tell the   library to use the digital pin the DS18B20 is connected to

DallasTemperature   sensors(&oneWire); // tell the library to compute temp on the oneWire pin

int   IOL; // initialize the LDR pin name as a 16-bit value

void setup() {
   Serial.begin(9600); // setup Serial for debug
  sensors.begin(); // start DS18B20
   IOL = analogRead(A0); // initialize LDR as analog pin 0 - read only
  lcd.begin(16,   2); // initialize lcd as 16 columns, 2 rows
  lcd.clear(); // clear any old data   on the lcd
  // if there is lots of ambient light, turn on the lcd backlight
   if (IOL < 500) {
    lcd.backlight();
  }
  // if the ambient light is   low, turn off the backlight
  if (IOL >= 500) {
    lcd.noBacklight();
   }
}

void loop() {
  IOL = analogRead(A0); // initialize LDR as analog   pin 0 - read only
  // if there is lots of ambient light, turn on the lcd backlight
   if (IOL < 500) {
    lcd.backlight();
  }
  // if the ambient light is   low, turn off the backlight
  if (IOL >= 500) {
    lcd.noBacklight();
   }

  sensors.requestTemperatures(); // send data asking for temperature   to DS18B20
  lcd.setCursor(0, 0); // set the lcd cursor for celsius temperature
   lcd.print("Temp C: "); // print explanation of following data
  lcd.print(sensors.getTempCByIndex(0));   // print the degrees in celsius
  lcd.print("       "); // print spaces to   blank out any remanants of data
  lcd.setCursor(0, 1); // set the lcd for farenheit   temperature
  lcd.print("Temp F: "); // print explanation of following data
   lcd.print(DallasTemperature::toFahrenheit(sensors.getTempCByIndex(0))); // Convert   tempC to Fahrenheit and print it
  lcd.print("       "); // print spaces to   blank out any remanants of data

/*
  sensors.requestTemperatures(); //   send data asking for temperature to DS18B20
  lcd.setCursor(0, 0); // set the   lcd cursor for celsius temperature
  lcd.print(F("Temp: ")); // print explanation   of following data from program storage
  lcd.print(sensors.getTempCByIndex(0));   // print the degrees in celsius
  lcd.print(F(" ")); // print space from program   storage
  lcd.print((char)223); // print degrees symbol
  lcd.print(F("C"));   // print celsius abbreviation
  lcd.print("       "); // print spaces to blank   out any remanants of data
  lcd.setCursor(0, 1); // set the lcd for light levels
   lcd.print(F("Light Level: ")); // print explanation of following data
  lcd.print(IOL);   // print light levels
  lcd.print("       "); // print spaces to blank out   any remanants of data
*/
}

TemperatureDisplay.ino

arduino

This is the code for the temperature display.

1#include <OneWire.h>                       // library to access DS18B20
2#include  <DallasTemperature.h>             // library to support DS18B20
3#include <Wire.h>                          // library for communicating to I2C devices
4#include  <hd44780.h>                       // main hd44780 library
5#include <hd44780ioClass/hd44780_I2Cexp.h>  // i2c expander i/o class library
6
7hd44780_I2Cexp lcd; // declare lcd object:  auto locate & auto configure expander chip
8
9OneWire oneWire(2); // tell the  library to use the digital pin the DS18B20 is connected to
10
11DallasTemperature  sensors(&oneWire); // tell the library to compute temp on the oneWire pin
12
13int  IOL; // initialize the LDR pin name as a 16-bit value
14
15void setup() {
16  Serial.begin(9600); // setup Serial for debug
17  sensors.begin(); // start DS18B20
18  IOL = analogRead(A0); // initialize LDR as analog pin 0 - read only
19  lcd.begin(16,  2); // initialize lcd as 16 columns, 2 rows
20  lcd.clear(); // clear any old data  on the lcd
21  // if there is lots of ambient light, turn on the lcd backlight
22  if (IOL < 500) {
23    lcd.backlight();
24  }
25  // if the ambient light is  low, turn off the backlight
26  if (IOL >= 500) {
27    lcd.noBacklight();
28  }
29}
30
31void loop() {
32  IOL = analogRead(A0); // initialize LDR as analog  pin 0 - read only
33  // if there is lots of ambient light, turn on the lcd backlight
34  if (IOL < 500) {
35    lcd.backlight();
36  }
37  // if the ambient light is  low, turn off the backlight
38  if (IOL >= 500) {
39    lcd.noBacklight();
40  }
41
42  sensors.requestTemperatures(); // send data asking for temperature  to DS18B20
43  lcd.setCursor(0, 0); // set the lcd cursor for celsius temperature
44  lcd.print("Temp C: "); // print explanation of following data
45  lcd.print(sensors.getTempCByIndex(0));  // print the degrees in celsius
46  lcd.print("       "); // print spaces to  blank out any remanants of data
47  lcd.setCursor(0, 1); // set the lcd for farenheit  temperature
48  lcd.print("Temp F: "); // print explanation of following data
49  lcd.print(DallasTemperature::toFahrenheit(sensors.getTempCByIndex(0))); // Convert  tempC to Fahrenheit and print it
50  lcd.print("       "); // print spaces to  blank out any remanants of data
51
52/*
53  sensors.requestTemperatures(); //  send data asking for temperature to DS18B20
54  lcd.setCursor(0, 0); // set the  lcd cursor for celsius temperature
55  lcd.print(F("Temp: ")); // print explanation  of following data from program storage
56  lcd.print(sensors.getTempCByIndex(0));  // print the degrees in celsius
57  lcd.print(F(" ")); // print space from program  storage
58  lcd.print((char)223); // print degrees symbol
59  lcd.print(F("C"));  // print celsius abbreviation
60  lcd.print("       "); // print spaces to blank  out any remanants of data
61  lcd.setCursor(0, 1); // set the lcd for light levels
62  lcd.print(F("Light Level: ")); // print explanation of following data
63  lcd.print(IOL);  // print light levels
64  lcd.print("       "); // print spaces to blank out  any remanants of data
65*/
66}
67

#include <OneWire.h>                       // library to access DS18B20
#include  <DallasTemperature.h>             // library to support DS18B20
#include <Wire.h>                          // library for communicating to I2C devices
#include  <hd44780.h>                       // main hd44780 library
#include <hd44780ioClass/hd44780_I2Cexp.h>  // i2c expander i/o class library

hd44780_I2Cexp lcd; // declare lcd object:  auto locate & auto configure expander chip

OneWire oneWire(2); // tell the  library to use the digital pin the DS18B20 is connected to

DallasTemperature  sensors(&oneWire); // tell the library to compute temp on the oneWire pin

int  IOL; // initialize the LDR pin name as a 16-bit value

void setup() {
  Serial.begin(9600); // setup Serial for debug
  sensors.begin(); // start DS18B20
  IOL = analogRead(A0); // initialize LDR as analog pin 0 - read only
  lcd.begin(16,  2); // initialize lcd as 16 columns, 2 rows
  lcd.clear(); // clear any old data  on the lcd
  // if there is lots of ambient light, turn on the lcd backlight
  if (IOL < 500) {
    lcd.backlight();
  }
  // if the ambient light is  low, turn off the backlight
  if (IOL >= 500) {
    lcd.noBacklight();
  }
}

void loop() {
  IOL = analogRead(A0); // initialize LDR as analog  pin 0 - read only
  // if there is lots of ambient light, turn on the lcd backlight
  if (IOL < 500) {
    lcd.backlight();
  }
  // if the ambient light is  low, turn off the backlight
  if (IOL >= 500) {
    lcd.noBacklight();
  }

  sensors.requestTemperatures(); // send data asking for temperature  to DS18B20
  lcd.setCursor(0, 0); // set the lcd cursor for celsius temperature
  lcd.print("Temp C: "); // print explanation of following data
  lcd.print(sensors.getTempCByIndex(0));  // print the degrees in celsius
  lcd.print("       "); // print spaces to  blank out any remanants of data
  lcd.setCursor(0, 1); // set the lcd for farenheit  temperature
  lcd.print("Temp F: "); // print explanation of following data
  lcd.print(DallasTemperature::toFahrenheit(sensors.getTempCByIndex(0))); // Convert  tempC to Fahrenheit and print it
  lcd.print("       "); // print spaces to  blank out any remanants of data

/*
  sensors.requestTemperatures(); //  send data asking for temperature to DS18B20
  lcd.setCursor(0, 0); // set the  lcd cursor for celsius temperature
  lcd.print(F("Temp: ")); // print explanation  of following data from program storage
  lcd.print(sensors.getTempCByIndex(0));  // print the degrees in celsius
  lcd.print(F(" ")); // print space from program  storage
  lcd.print((char)223); // print degrees symbol
  lcd.print(F("C"));  // print celsius abbreviation
  lcd.print("       "); // print spaces to blank  out any remanants of data
  lcd.setCursor(0, 1); // set the lcd for light levels
  lcd.print(F("Light Level: ")); // print explanation of following data
  lcd.print(IOL);  // print light levels
  lcd.print("       "); // print spaces to blank out  any remanants of data
*/
}

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