LM35 temperature sensor
The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Centigrade scaling. The LM35 does not require any external calibration or trimming to provide typical accuracies of ±1/4°C at room temperature and ±3/4°C over a full -55 to +150°C temperature range
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| LM35 temperature sensor pinout |
1.Arduino uno
2.LCD Display
3.LM 35 LM35 temperature sensor
4. LED
Project Overview
In this project you can see your temperature on LCD Display and control your output according to temperate and also you can see ADC valu on your Lcd Display
Source code
#include <LiquidCrystal.h>
LiquidCrystal lcd (7,6,5,4,3,2); //RS cont 7pin //E 6pin //D3, D4, D5, D6, pin no 5,4,3,2
float value;
int cel;
int far;
int output1=8;
int output2=9;
int output3=10;
void setup()
{
Serial.begin(9600);
lcd.begin(16,2);
pinMode(output1,OUTPUT);
pinMode(output2,OUTPUT);
pinMode(output3,OUTPUT);
digitalWrite(output1,LOW);
digitalWrite(output2,LOW);
digitalWrite(output3,LOW);
}
void loop()
{
value=analogRead(A0);
value = (value*5000)/1024;
cel=value/10;
far = (cel*9)/5;
far = far+32;
lcd.setCursor(0,0);
lcd.print("Temperat");
lcd.setCursor(0,1);
lcd.print(cel);
lcd.print(char(223));
lcd.print("C");
lcd.setCursor(4,1);
lcd.print(",");
lcd.setCursor(5,1);
lcd.print(far);
lcd.print(char(223));
lcd.print("F");
lcd.setCursor(9,0);
lcd.print("|");
lcd.setCursor(9,1);
lcd.print("|");
lcd.setCursor(10,0);
lcd.print("ADC is");
lcd.setCursor(10,1);
lcd.print(value);
if(cel>=28)
{
digitalWrite(output1,HIGH);
digitalWrite(output2,LOW);
digitalWrite(output3,LOW);
}
if(cel>=30)
{
digitalWrite(output2,HIGH);
digitalWrite(output1,LOW);
digitalWrite(output3,LOW);
}
if(cel>=33)
{
digitalWrite(output2,LOW);
digitalWrite(output3,HIGH);
digitalWrite(output1,LOW);
}
if(cel<=27){
digitalWrite(output2,LOW);
digitalWrite(output3,LOW);
digitalWrite(output1,LOW);
}
delay(100);
}
//K connect to ground and A connected to 5v
//VSS cont to GROUND
//VDD cont to 5V
//VO cont to GROUND
//RS cont 7pin
//E 6pin
//D3, D4, D5, D6, pin no 5,4,3,2
Arduino and lm35 schematic
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| Arduino and lm35 schematic |
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