LCD Thermometer With LEDs And Alarm Signal

An easy project using stuff from the starter kit: Arduino Uno, temperature sensor, 16x2 LCD display, some LEDs and a Piezo.

Feb 3, 2018

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30 respects

environmental sensing

Components and supplies

Single Turn Potentiometer- 10k ohms

Temperature Sensor

Piezo

Standard LCD - 16x2 White on Blue

Resistor 330 ohm

Breadboard (generic)

LED (generic)

Arduino UNO

Project description

Code

Untitled file

arduino

1#include <LiquidCrystal.h>
2LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
3int  sensorPin = 0;
4float tempC;
5void setup() {
6  pinMode(7, OUTPUT);
7  pinMode(8,  OUTPUT);
8  pinMode(13, OUTPUT);
9  pinMode(9, INPUT);
10lcd.begin(16, 2);
11}
12void  loop() {
13tempC = get_temperature(sensorPin);
14lcd.setCursor(0,0);
15lcd.print("Temperature:  "); 
16lcd.setCursor(0,1);
17lcd.print (tempC, 1); lcd.print(" "); lcd.print("C");
18delay(200);
19
20  if (tempC <= 23){
21    digitalWrite(8, HIGH);
22    digitalWrite(7, LOW);
23    digitalWrite(13, LOW);
24    noTone(9);
25   
26  }
27 else if (tempC >  26){
28    digitalWrite(7, LOW);
29    digitalWrite(8, LOW);
30    digitalWrite(13,  HIGH);
31    tone(9, 440, 250);
32    delay(500);
33    
34  }
35  else {
36    digitalWrite(7, HIGH);
37    digitalWrite(8, LOW);
38    digitalWrite(13,  LOW);
39    noTone(9);
40  } 
41 
42}
43float get_temperature(int pin) {
44float  temperature = analogRead(pin);
45float voltage = temperature * 5.0;
46voltage  = voltage / 1024.0;
47return ((voltage - 0.5) * 100);
48}
49
50

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int  sensorPin = 0;
float tempC;
void setup() {
  pinMode(7, OUTPUT);
  pinMode(8,  OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(9, INPUT);
lcd.begin(16, 2);
}
void  loop() {
tempC = get_temperature(sensorPin);
lcd.setCursor(0,0);
lcd.print("Temperature:  "); 
lcd.setCursor(0,1);
lcd.print (tempC, 1); lcd.print(" "); lcd.print("C");
delay(200);

  if (tempC <= 23){
    digitalWrite(8, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(13, LOW);
    noTone(9);
   
  }
 else if (tempC >  26){
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(13,  HIGH);
    tone(9, 440, 250);
    delay(500);
    
  }
  else {
    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
    digitalWrite(13,  LOW);
    noTone(9);
  } 
 
}
float get_temperature(int pin) {
float  temperature = analogRead(pin);
float voltage = temperature * 5.0;
voltage  = voltage / 1024.0;
return ((voltage - 0.5) * 100);
}

Untitled file

arduino

1#include <LiquidCrystal.h>
2LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
3int
4  sensorPin = 0;
5float tempC;
6void setup() {
7  pinMode(7, OUTPUT);
8  pinMode(8,
9  OUTPUT);
10  pinMode(13, OUTPUT);
11  pinMode(9, INPUT);
12lcd.begin(16, 2);
13}
14void
15  loop() {
16tempC = get_temperature(sensorPin);
17lcd.setCursor(0,0);
18lcd.print("Temperature:
19  "); 
20lcd.setCursor(0,1);
21lcd.print (tempC, 1); lcd.print(" "); lcd.print("C");
22delay(200);
23
24
25  if (tempC <= 23){
26    digitalWrite(8, HIGH);
27    digitalWrite(7, LOW);
28
29    digitalWrite(13, LOW);
30    noTone(9);
31   
32  }
33 else if (tempC >
34  26){
35    digitalWrite(7, LOW);
36    digitalWrite(8, LOW);
37    digitalWrite(13,
38  HIGH);
39    tone(9, 440, 250);
40    delay(500);
41    
42  }
43  else {
44
45    digitalWrite(7, HIGH);
46    digitalWrite(8, LOW);
47    digitalWrite(13,
48  LOW);
49    noTone(9);
50  } 
51 
52}
53float get_temperature(int pin) {
54float
55  temperature = analogRead(pin);
56float voltage = temperature * 5.0;
57voltage
58  = voltage / 1024.0;
59return ((voltage - 0.5) * 100);
60}
61
62

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int
  sensorPin = 0;
float tempC;
void setup() {
  pinMode(7, OUTPUT);
  pinMode(8,
  OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(9, INPUT);
lcd.begin(16, 2);
}
void
  loop() {
tempC = get_temperature(sensorPin);
lcd.setCursor(0,0);
lcd.print("Temperature:
  "); 
lcd.setCursor(0,1);
lcd.print (tempC, 1); lcd.print(" "); lcd.print("C");
delay(200);


  if (tempC <= 23){
    digitalWrite(8, HIGH);
    digitalWrite(7, LOW);

    digitalWrite(13, LOW);
    noTone(9);
   
  }
 else if (tempC >
  26){
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(13,
  HIGH);
    tone(9, 440, 250);
    delay(500);
    
  }
  else {

    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
    digitalWrite(13,
  LOW);
    noTone(9);
  } 
 
}
float get_temperature(int pin) {
float
  temperature = analogRead(pin);
float voltage = temperature * 5.0;
voltage
  = voltage / 1024.0;
return ((voltage - 0.5) * 100);
}

Downloadable files

Schematics

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