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

Components and supplies

M/M Jumper Leads

Mini Breadboard

Arduino UNO

I2C LCD

4.7k resistor

LDR Module

DS18B20

Apps and platforms

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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Downloadable files