I’m a design technologist in Atlanta. I like working on the front-end of the web. This is my site, Zento where I blog, share and write tutorials…
In this project, we’ll build an IoT project that display real-time temperature and humidity data from the…
The code for the ESP32 using the DHT11, DHT20, or DHT22 is identical to the Arduino example…
In the I2C protocol, each device on the bus is identified by a unique address. The master…
The DHT20 is a high-precision temperature and humidity sensor that communicates using the I2C protocol. This sensor…
In this guide, we will explore how to combine DHT temperature/humidity sensors with LCD displays using I2C…
When working with floating-point numbers in Arduino, there may be cases where a calculation results in an…
In this guide, we will explore the DHTesp library, a powerful tool for interfacing with DHT temperature…
In this chapter, we will explore Digital Humidity and Temperature (DHT) sensors, which are essential components for…
This code allows multiple ESP32 devices to communicate with each other wirelessly using ESP-WIFI-MESH Setup Instructions ESP-MESH…
ESP-WIFI-MESH is a networking protocol developed by Espressif that enables multiple ESP32 or ESP8266 devices to form…
Here’s a simple example to demonstrate how to use ESP-NOW for communication between two ESP32 devices. ESP32…
ESP-NOW is a wireless communication protocol developed by Espressif for the ESP32 chip. It’s designed to enable…
This example will set up the ESP32 as a BLE server with a writable characteristic. The value…
The following example creates a BLE server with a single service and characteristic. The characteristic can be…
ESP32 Bluetooth BLE is perfect for devices that need to run on battery for long periods (months…
Here’s a simple ESP32 Bluetooth Classic example that demonstrates how to set up an ESP32 as a…
ESP32 has built-in Bluetooth capabilities, supporting both Bluetooth Classic (BT) and Bluetooth Low Energy (BLE). Although both…
LittleFS is now integrated into Arduino ESP32 Core v2, making it easier to store files on the…
LittleFS (Little File System) is a lightweight file system designed for microcontrollers and embedded systems. It is…
ESP32’s Flash memory is an external SPI-based storage that serves multiple purposes: This external SPI-based storage IC…
The API for Preferences is simple and easy to use. Here’s a breakdown of the typical operations:…
The ESP32 Preferences library provides a simple and efficient way to store key-value pairs in the ESP32’s…
The volatile keyword in C/C++ is used to inform the compiler that a particular variable can be…
The ESP32 allows interrupts to be triggered on GPIO pins. The most common scenarios are when a…
An interrupt is a mechanism that allows a microcontroller like the ESP32 to pause the execution of…
The RTC GPIOs are part of the RTC (Real-Time Clock) controller and remain active even when the…
RTC memory cannot be used in Hibernation Mode, but data can be saved persistently using flash storage….
RTC (Real-Time Clock) memory is a small portion of memory in the ESP32 that remains powered during…
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