ARDUINO Project #001 : Mesin Penghitung Otomatis E18-D80NK

Summary

In this video, the presenter introduces the concept of interrupts in programming, explaining how they function to pause a running loop and allow a specific task to be executed. The demonstration uses an Arduino Nano with an ATmega328 IC, showing how an interrupt can be triggered using a sensor. The setup includes a 16x2 LCD, a sensor, and an Arduino, where the sensor counts objects passing by. The tutorial walks through the process of connecting components and coding, offering a hands-on example to understand interrupts and their application in a simple counting machine.

Takeaways

• 😀 Interrupts are instructions that pause a running program to handle an interrupt signal and then resume execution.
• 😀 Interrupts in Arduino can only be triggered by pins 2 and 3 on the ATmega328 microcontroller.
• 😀 Certain instructions, like 'delay()', are incompatible with interrupts, as they use interrupts themselves.
• 😀 The 'delayMicroseconds()' function remains usable even when interrupts are in use.
• 😀 The tutorial uses an Arduino Nano, a 16x2 LCD, and a sensor to create a counting system that detects objects.
• 😀 Proper wiring for the setup includes connecting the 5V and ground to the Arduino and wiring the LCD and sensor pins accordingly.
• 😀 The sensor has three pins: VCC (brown), GND (blue), and OUTPUT (black), with the output connected to pin 2 on the Arduino for the interrupt.
• 😀 The program initializes the LCD, creates a counter variable, and sets up an interrupt on pin 2 to count objects detected by the sensor.
• 😀 The counting system uses polling to detect objects, and when an object passes, the interrupt triggers and increments the counter.
• 😀 The LCD displays the updated count every time an object is detected by the sensor.
• 😀 This tutorial helps understand how to use interrupts with Arduino and how to implement them in real-time applications like object counting.

Q & A

What is an interrupt in Arduino programming?

An interrupt in Arduino programming is a mechanism where the ongoing program execution (usually within a loop) is paused to immediately handle a specific task when the interrupt signal is triggered.

Which pins on the Arduino Nano are used for interrupts?

On the Arduino Nano, interrupts can only be used on pins 2 and 3. Other pins do not support interrupts.

What happens when an interrupt occurs during the program's execution?

When an interrupt occurs, the normal program execution is paused, and the interrupt service routine (ISR) is executed. After the ISR is completed, the program resumes where it left off.

Can the `delay()` function be used when an interrupt is active?

No, the `delay()` function cannot be used when an interrupt is active because it will block the processor from responding to other interrupts. Shorter delays, such as `micros()`, are acceptable.

What is the purpose of the 16x2 LCD in this project?

The 16x2 LCD in this project is used to display the count of objects detected by the sensor as they pass in front of it.

What hardware components are used in this interrupt-based project?

The hardware components include an Arduino board (such as the Arduino Nano), a 16x2 LCD display, and a sensor (likely an infrared or optical sensor) for detecting objects.

How is the sensor connected to the Arduino Nano for interrupt functionality?

The sensor is connected to pin 2 of the Arduino Nano because this pin supports interrupt functionality. The sensor’s output pin is linked to the interrupt pin to trigger the interrupt when an object is detected.

What does the program do when the sensor detects an object?

When the sensor detects an object, it triggers the interrupt, and the program increments a counter variable. This counts how many objects pass in front of the sensor.

How is the interrupt configured in the Arduino code?

In the Arduino code, the interrupt is set using the `attachInterrupt()` function, where the interrupt pin (pin 2 in this case) is assigned to a function that increments the counter when the interrupt is triggered.

How can the user interact with the code in this project?

The user can interact with the code by uploading it to the Arduino board and observing the LCD, which displays the count of detected objects. The code is also available for download from the video description for users to modify or learn from.