Arduino - VI

We continue the discussion on Arduino. In the sixth post on Arduino, we add the time element to a temperature sensor reading and see the output in serial monitor. We will use the same environment as in the first post of this series

In the last post, by importing a library called TimeLib.h we added the time element to Arduino. For the temperature reading, we will add LM35 sensor. Details about the sensor is here.

The code is shown below:

#include <TimeLib.h>

int tempPin = 0;     // initialize the number of temperature sensor output data pin

int temp_reading;    // declare variable for temperature reading

float temp_celcius;  // declare variable for temperature reading

void setup() {

  Serial.begin(9600);  // initialize serial port

  setTime(1542982538); //The argument to setTime must be Unix time 

}

void loop() {

  temp_reading = analogRead(tempPin);

  temp_celcius = (temp_reading/1024.0)*500; 

  digitalClockDisplay();

  Serial.print(" : ");

  Serial.println(temp_celcius); //temperature in Celcius

  delay(5000);

}

void digitalClockDisplay(){

  // ref https://github.com/PaulStoffregen/Time

  // digital clock display of the time

  Serial.print(day());

  Serial.print("/");

  Serial.print(month());

  Serial.print("/");

  Serial.print(year()); 

  Serial.print(" ");

  Serial.print(hour());

  printDigits(minute());

  printDigits(second());

  Serial.print(" ");

}

void printDigits(int digits){

  // ref https://github.com/PaulStoffregen/Time

  // utility function for digital clock display: prints preceding colon and leading 0

  Serial.print(":");

  if(digits < 10)

    Serial.print('0');

  Serial.print(digits);

}

The circuit is shown below:

Upload above program into Arduino. The serial monitor output is shown below:

This concludes the post on adding time element to a temperature reading in Arduino