DIY Electronics is a popular hobby among electronics enthusiasts, as it allows individuals to create their own electronic projects from scratch. Arduino, a widely used microcontroller platform, has made it easier for beginners to get started with DIY electronics. In this article, we will explore the world of DIY electronics using Arduino and provide code examples and a list of components to help you get started.

Project: In this example project, we will create a simple temperature monitoring system using Arduino. The objective of this project is to measure the temperature using a temperature sensor and display it on an LCD screen. This project can be a great starting point for beginners to understand the basics of Arduino programming and sensor interfacing.

Components List:

• Arduino Uno (1)
• Breadboard (1)
• Jumper wires (Male to Male) (10)
• LM35 Temperature Sensor (1)
• 16x2 LCD Display (1)
• Potentiometer (1)
• 220Ω Resistor (1)
• 10kΩ Resistor (1)

Examples:

#include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int temperaturePin = A0;

void setup() {
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);

  // Print a welcome message on the LCD
  lcd.print("Temperature:");
}

void loop() {
  // Read the analog value from the temperature sensor
  int sensorValue = analogRead(temperaturePin);

  // Convert the analog value to temperature in Celsius
  float temperature = (sensorValue * 5.0 / 1023.0) * 100.0;

  // Set the cursor to the second line of the LCD
  lcd.setCursor(0, 1);

  // Print the temperature on the LCD
  lcd.print(temperature);
  lcd.print("C");

  // Delay for 1 second before taking the next reading
  delay(1000);
}

In this code example, we first include the LiquidCrystal library, which allows us to interface with the LCD display. We then initialize the library by specifying the interface pins of the Arduino connected to the LCD. In the setup function, we set up the LCD's number of columns and rows and print a welcome message on the LCD.

In the loop function, we read the analog value from the temperature sensor connected to pin A0. We then convert the analog value to temperature in Celsius using the formula provided by the sensor's datasheet. We set the cursor to the second line of the LCD and print the temperature followed by the unit "C". Finally, we add a delay of 1 second before taking the next reading to avoid rapid updates on the LCD.

This example demonstrates how to interface a temperature sensor and an LCD display with Arduino to create a simple temperature monitoring system. You can further enhance this project by adding features like temperature thresholds and alarms.