Category: Arduino Projects

This project is perfect if you’ve ever wondered how to build a user-friendly countdown timer with an interactive menu, memory storage, and buzzer alerts. This step-by-step guide will walk you through creating an Arduino countdown timer using an I2C 20×4 LCD, push buttons, and a buzzer. The functions of this timer include setting and saving the countdown time, pausing and resetting, and even with buzzer notifications loudly when the time is up. This project is great for beginners, but it’s also feature-packed for advanced makers. In addition, it uses EEPROM to store your settings, so your countdown configuration will survive even when power is lost. Let’s get started! Why Build an Arduino Countdown Timer? Timers are an integral part of a wide variety of activities, from cooking and workout routines to the operations in industry. While there are many timers commercially available, building your own enables feature customization, serves as an introduction to learning about…

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Ever found yourself squinting at a bright day, thinking, “How much light is actually hitting my face?” Well, using an Arduino light meter that guesswork is gone. You’re practically giving your Arduino a pair of shades, but this one isn’t there to block the light-it’s there to measure it. Sounds cool, right? Let’s dive in. Why Build a Light Meter? Imagine having a gadget that tells you how bright your workspace is, or whether your plants are getting enough sunlight. That’s the power of this little project. Using an ambient…

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The ESP32 is one of the best choices for IoT projects because of its built-in Wi-Fi, Bluetooth, and energy-saving features. In battery-powered applications, deep sleep mode is especially useful for reducing power consumption while the device waits for a trigger to wake up. The following tutorial covers how to implement deep sleep mode, discuss differences from other low-power modes like light sleep and hibernation, configure wake-up sources, and manage data across sleep cycles to help IoT devices with long runtime on a single charge. Why Use Low Power Modes? Low-power…

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In this project, we will build a temperature, humidity, and dew point data logger with ESP32. This system will show the current time on a 20×4 LCD along with temperature, humidity, and dew point and periodically log the data on an SD card. In the design, an ESP32 microcontroller is used, together with a DS3231 RTC module for correct time representation and a CHT8305 sensor for temperature and humidity readings. The temperature, humidity, and dew point data logger with ESP32 is a versatile project useful in applications such as environmental…

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In embedded systems, time information is monitored through logging and data storage. Most microcontrollers, including ESP32, can store sensor readings, logs, or configuration files on SD cards. In this tutorial, we will explain how to interface an SD card with the ESP32 microcontroller and display the card’s status along with volume on a 20×4 I2C LCD. We will then create a text file on the SD card and write some data. Figure 1: Components of esp32 and SD card Interfacing Hardware Components Required ESP32 development board SD card module SD…

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Sometimes, we must connect multiple LCDs to Arduino to display parameter readings or messages. In the tutorial “How to Interface Multiple I2C LCDs to Arduino,” you will learn how to interface multiple 16×2 I2C LCDs to your Arduino. After completing this tutorial, you will able to know: Select a different address for a 16×2 or 20 x 4 I2C LCD. How to interface multiple I2C LCDs with your Arduino? How to select a different address for different 16×2 LCD We have to configure some hardware to select the address of…

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The CHT8305 sensor is a reliable temperature and humidity sensor popularly known for its high accuracy and low power consumption. It uses I2C to talk, and the device interfaces easily with most microcontrollers like Arduino and ESP32. Adding a 20×4 I2C LCD display to your setup is a great way to easily monitor real-time temperature and humidity values. In this article, I’ll walk you through how to interface the CHT8305 sensor with both Arduino and ESP32, and we’ll also incorporate the LCD display. I’ll break down each step, provide the…

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