Contents
Basics
A Digital Thermometer can be easily constructed using a PIC Microcontroller and LM35 Temperature Sensor. LM35 series is a low cost and precision Integrated Circuit Temperature Sensor whose output voltage is proportional to Centigrade temperature scale. Thus LM35 has an advantage over other temperature sensors calibrated in Kelvin as the users don’t require subtraction of large constant voltage to obtain the required Centigrade temperature. It doesn’t requires any external calibration. It is produced by National Semiconductor and can operate over a -55 °C to 150 °C temperature range. Its output is linearly proportional to Centigrade Temperature Scale and it output changes by 10 mV per °C.
The LM35 Temperature Sensor has Zero offset voltage, which means that the Output = 0V, at 0 °C. Thus for the maximum temperature value (150 °C), the maximum output voltage of the sensor would be 150 * 10 mV = 1.5V. If we use the supply voltage (5V) as the Vref+ for Analog to Digital Conversion (ADC) the resolution will be poor as the input voltage will goes only up to 1.5V and the power supply voltage variations may affects ADC output. So it is better to use a stable low voltage above 1.5 as Vref+. We should supply Negative voltage instead of GND to LM35 for measuring negative Temperatures.
This article only covers the basic working of Digital Thermometer using PIC Microcontroller and LM35, and uses 5V as Vref+. If you want more accurate results it is better to select Vref+ above 2.2V. I suggest you to use MCP1525 IC manufactured by Microchip, which will provide precise output voltage 2.5.
Suggested Readings:
Circuit Diagram
Note: VDD and VSS of the pic microcontroller is not shown in the circuit diagram. VDD should be connected to +5V and VSS to GND.
You can download the complete MikroC Source Code and Proteus files at the bottom of this post. The Analog output voltage of LM35 temperature sensor is given to the Analog Input pin AN0 of the PIC Microcontroller. The result of the 10-bit Analog to Digital (A/D) Conversion is read using the function ADC_Read(0). This 10-bit digital value is then converted to the corresponding voltage by multiplying with 0.4887 (For More Details read: Analog to Digital Converter in PIC Microcontroller). Then the Voltage is converted to corresponding character to Display it in LCD.
MikroC Code
// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
sbit LCD_RS_Direction at TRISB2_bit;
sbit LCD_EN_Direction at TRISB3_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections
int t;
char a;
char lcd[] = "000 Degree";
void main()
{
ADCON1 = 0x04;
Lcd_Init();
Lcd_Cmd(_LCD_CURSOR_OFF);
do
{
Lcd_Cmd(_LCD_CLEAR);
Lcd_out(1,1, "Temperature:");
t = ADC_Read(0);
t = t * 0.4887;
a = t%10;
lcd[2] = a + '0';
t = t/10;
a = t%10;
lcd[1] = a + '0';
t = t/10;
a = t%10;
lcd[0] = a + '0';
Lcd_out(2,1,lcd);
Delay_ms(100);
}while(1);
}
Download Here
You can download the MikroC Source Code and Proteus files etc from here.