How to make digital temperature measurement device

In this tutorial, I will show you how to make digital temperature measurement device or digital thermometer with thermistor and arduino.

Nov 5, 2020

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environmental sensing

Components and supplies

Arduino Nano R3

Alphanumeric LCD, 16 x 2

Resistor 10k ohm

Jumper wires (generic)

Breadboard (generic)

Apps and platforms

Arduino IDE

Project description

Code

Arduino Code

arduino

1#include <math.h>
2#include "LiquidCrystal.h"
3LiquidCrystal lcd(2,3,4,5,6,7);
4float   A = 1.009249522e-03, B = 2.378405444e-04, C = 2.019202697e-07;
5float T,logRt,Tf,Tc;
6float   Thermistor(int Vo) {
7 logRt = log(10000.0*((1024.0/Vo-1))); 
8 T = (1.0 / (A   + B*logRt + C*logRt*logRt*logRt)); 
9 Tc = T - 273.15;                     //   Convert Kelvin to Celcius
10 Tf = (Tc * 1.8) + 32.0;              // Convert Kelvin   to Fahrenheit
11 return T;
12}
13
14void setup(){
15 lcd.begin(16,2);
16 lcd.setCursor(0,0);
17   lcd.print(" Digital");
18 lcd.setCursor(0,1);
19 lcd.print(" Temperature");
20   delay(8000);
21 lcd.clear();
22 lcd.print(" Shashwat__Raj");
23 delay(8000);
24   lcd.clear();
25}
26
27void loop() 
28{
29 lcd.setCursor(0,0);
30  lcd.print("Temp:");
31   lcd.print((Thermistor(analogRead(0))));
32  lcd.print("k ");
33 
34 lcd.setCursor(0,1);
35   lcd.print((Tc));
36  lcd.print(" C ;");
37
38 lcd.setCursor(9,1);
39  lcd.print((Tf));
40   lcd.print(" F");
41 delay(800);
42}
43

#include <math.h>
#include "LiquidCrystal.h"
LiquidCrystal lcd(2,3,4,5,6,7);
float   A = 1.009249522e-03, B = 2.378405444e-04, C = 2.019202697e-07;
float T,logRt,Tf,Tc;
float   Thermistor(int Vo) {
 logRt = log(10000.0*((1024.0/Vo-1))); 
 T = (1.0 / (A   + B*logRt + C*logRt*logRt*logRt)); 
 Tc = T - 273.15;                     //   Convert Kelvin to Celcius
 Tf = (Tc * 1.8) + 32.0;              // Convert Kelvin   to Fahrenheit
 return T;
}

void setup(){
 lcd.begin(16,2);
 lcd.setCursor(0,0);
   lcd.print(" Digital");
 lcd.setCursor(0,1);
 lcd.print(" Temperature");
   delay(8000);
 lcd.clear();
 lcd.print(" Shashwat__Raj");
 delay(8000);
   lcd.clear();
}

void loop() 
{
 lcd.setCursor(0,0);
  lcd.print("Temp:");
   lcd.print((Thermistor(analogRead(0))));
  lcd.print("k ");
 
 lcd.setCursor(0,1);
   lcd.print((Tc));
  lcd.print(" C ;");

 lcd.setCursor(9,1);
  lcd.print((Tf));
   lcd.print(" F");
 delay(800);
}

Arduino Code

arduino

1#include <math.h>
2#include "LiquidCrystal.h"
3LiquidCrystal lcd(2,3,4,5,6,7);
4float  A = 1.009249522e-03, B = 2.378405444e-04, C = 2.019202697e-07;
5float T,logRt,Tf,Tc;
6float  Thermistor(int Vo) {
7 logRt = log(10000.0*((1024.0/Vo-1))); 
8 T = (1.0 / (A  + B*logRt + C*logRt*logRt*logRt)); 
9 Tc = T - 273.15;                     //  Convert Kelvin to Celcius
10 Tf = (Tc * 1.8) + 32.0;              // Convert Kelvin  to Fahrenheit
11 return T;
12}
13
14void setup(){
15 lcd.begin(16,2);
16 lcd.setCursor(0,0);
17  lcd.print(" Digital");
18 lcd.setCursor(0,1);
19 lcd.print(" Temperature");
20  delay(8000);
21 lcd.clear();
22 lcd.print(" Shashwat__Raj");
23 delay(8000);
24  lcd.clear();
25}
26
27void loop() 
28{
29 lcd.setCursor(0,0);
30  lcd.print("Temp:");
31  lcd.print((Thermistor(analogRead(0))));
32  lcd.print("k ");
33 
34 lcd.setCursor(0,1);
35  lcd.print((Tc));
36  lcd.print(" C ;");
37
38 lcd.setCursor(9,1);
39  lcd.print((Tf));
40  lcd.print(" F");
41 delay(800);
42}
43

#include <math.h>
#include "LiquidCrystal.h"
LiquidCrystal lcd(2,3,4,5,6,7);
float  A = 1.009249522e-03, B = 2.378405444e-04, C = 2.019202697e-07;
float T,logRt,Tf,Tc;
float  Thermistor(int Vo) {
 logRt = log(10000.0*((1024.0/Vo-1))); 
 T = (1.0 / (A  + B*logRt + C*logRt*logRt*logRt)); 
 Tc = T - 273.15;                     //  Convert Kelvin to Celcius
 Tf = (Tc * 1.8) + 32.0;              // Convert Kelvin  to Fahrenheit
 return T;
}

void setup(){
 lcd.begin(16,2);
 lcd.setCursor(0,0);
  lcd.print(" Digital");
 lcd.setCursor(0,1);
 lcd.print(" Temperature");
  delay(8000);
 lcd.clear();
 lcd.print(" Shashwat__Raj");
 delay(8000);
  lcd.clear();
}

void loop() 
{
 lcd.setCursor(0,0);
  lcd.print("Temp:");
  lcd.print((Thermistor(analogRead(0))));
  lcd.print("k ");
 
 lcd.setCursor(0,1);
  lcd.print((Tc));
  lcd.print(" C ;");

 lcd.setCursor(9,1);
  lcd.print((Tf));
  lcd.print(" F");
 delay(800);
}

Downloadable files

Circuit Diagram

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