Temperature on LCD 16x2

In my previous post, I have displayed the temperature on serial monitor. Today I will show you how to display the temperature from the thermistor to a 16x2 LCD WC1602A0. Yesterday I thought that my display is broken, but I have give him one more chance before give it away, and it was a shock for me to see that he is working.

Step 1: Make the Connections

The connections are simple. Like in the image.

You will need a display, some wires, 2 x led, 3 resistor 560 ohm, one 10k resistor, a 10k thermistor, breadboard and arduino.

Step 2: Code

The code is very simple, instate doing the serial print, you have to print your results on a LCD.I have also attached the code, because sometimes are problems by copy paste. So the code is:

/*
ADC C

250, 1.4

275, 4.0

300, 6.4

325, 8.8

350, 11.1

375, 13.4

400, 15.6

425, 17.8

450, 20.0

475, 22.2

500, 24.4

525, 26.7

550, 29.0

575, 31.3

600, 33.7

625, 36.1

650, 38.7

675, 41.3

700, 44.1

725, 47.1

750, 50.2

775, 53.7

784, 55.0

800, 61.5

850, 66.2

875, 71.5

900, 77.9

925, 85.7

937, 90.3

950, 96.0

975, 111.2

1000, 139.5

*/

#include<math.h>

#include<LiquidCrystal.h>

LiquidCrystal lcd (2, 3, 4, 5, 6, 7);//this are the lcd pins

double Thermister(int RawADC)

{

double temp;

temp = log(((10240000/RawADC) - 10000));

temp = 1 / (0.001129148 + (0.000234125 * temp) + (0.0000000876741 * temp * temp * temp)); temp = temp - 273.15; // convertire kelvin la celsius

lcd.print("Celsius=");//you print your values on your display

return temp;

}

int tempPin = 1; // conectare termistor si rezistenta de 10k

int temp; // citire analog int

LEDCool = 10; // Led temperatura joasa

int LEDHot =9; // LED temperatura peste temperatura mediului ambiant

int breakPoint = 450;

void setup(void)

{

lcd.begin(16,2);

lcd.clear();

Serial.begin(115200);

}

void loop(void)

{

temp = analogRead(tempPin);

lcd.println(int(Thermister(analogRead(1))));

lcd.print("Kelvin = ");

lcd.println(temp); // citire valori

if (temp <= breakPoint)

{

//in functie de temperatura de referinta hotaraste daca e cald sau rece

digitalWrite (LEDCool, HIGH);

digitalWrite (LEDHot, LOW);

}

else

{

digitalWrite (LEDHot, HIGH);

digitalWrite (LEDCool, LOW); delay(100);

}

}

Step 3: Results

On the lcd you will receive the temperature and the led will be red or yellow, that depends of the temperature you measure.

red=hot

yellow=cool