The importance and usefulness of a temperature sensor

A temperature sensor is a crucial component in many electronic systems and projects. It allows us to measure and monitor the temperature of our environment, enabling us to make informed decisions and take appropriate actions. Temperature sensors can be used in a wide range of applications, including home automation, industrial control systems, weather monitoring, and more.

By accurately measuring temperature, we can implement temperature control systems, detect abnormal temperature variations, and trigger alarms or notifications when necessary. This information can be used to optimize energy consumption, ensure equipment safety, and improve overall efficiency.

Projeto: Temperature monitoring system with Arduino

In this example project, we will create a temperature monitoring system using an Arduino board and a temperature sensor. The objective is to measure the temperature of the surroundings and display the readings on an LCD screen.

Components needed:

• Arduino board (1x): Link to purchase
• Temperature sensor (1x): Link to purchase
• LCD screen (1x): Link to purchase
• Jumper wires: Link to purchase

Examples:

1. Reading temperature values using Arduino and the temperature sensor:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize the LCD screen

const int temperaturePin = A0; // Analog pin for temperature sensor

void setup() {
  lcd.begin(16, 2);
  lcd.print("Temperature:");
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(temperaturePin);
  float temperature = (sensorValue / 1024.0) * 5.0 * 100.0; // Convert sensor value to temperature in Celsius
  lcd.setCursor(0, 1);
  lcd.print(temperature);
  Serial.println(temperature);
  delay(1000);
}

Explanation:

• We include the necessary libraries for using the LCD screen and I2C communication.
• The LCD screen is initialized with its address and dimensions.
• The analog pin connected to the temperature sensor is defined.
• In the setup function, we initialize the LCD screen and print a static message.
• In the loop function, we read the analog value from the temperature sensor and convert it to Celsius.
• The temperature is displayed on the LCD screen and printed to the serial monitor.
• A delay of 1 second is added between readings.

2. Triggering an alarm based on temperature thresholds:

const int temperaturePin = A0; // Analog pin for temperature sensor
const int alarmPin = 2; // Digital pin for alarm

void setup() {
  pinMode(alarmPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(temperaturePin);
  float temperature = (sensorValue / 1024.0) * 5.0 * 100.0; // Convert sensor value to temperature in Celsius

  if (temperature > 30) {
    digitalWrite(alarmPin, HIGH); // Turn on the alarm
    Serial.println("High temperature detected!");
  } else {
    digitalWrite(alarmPin, LOW); // Turn off the alarm
  }

  delay(1000);
}

Explanation:

• We define the analog pin connected to the temperature sensor and the digital pin connected to the alarm.
• In the setup function, we set the alarm pin as an output.
• In the loop function, we read the temperature value and convert it to Celsius.
• If the temperature exceeds 30 degrees Celsius, the alarm is turned on and a message is printed to the serial monitor.
• Otherwise, the alarm is turned off.
• A delay of 1 second is added between readings.