ESP-NOW is a proprietary low-power, low-latency wireless protocol by Espressif that allows ESP32 boards to talk directly to each other without creating full Wi-Fi connections. It’s ideal for building a fast sensor network that reports into Home Assistant through a…
A “smart” bathroom fan should: Below is a complete Home Assistant implementation that uses: The logic is split into three parts: 1. Prerequisites: Entities Used Assumed entities: If the fan is a switch, just replace fan.bathroom_fan with switch.bathroom_fan in the…
When an ESP32 randomly resets, freezes, or shows a “Guru Meditation Error”, one of the simplest and most effective ways to find the problem is to log progress to the Serial Monitor. The idea is very basic: Add Serial.println(“Line X”);…
This project shows how to do a simple LoRa “Hello World” send & receive test using two TTGO LoRa32 (SX1276) boards with built-in 0.96″ SSD1306 OLED displays. We’ll configure one board as a sender, which sends a counter every second,…
The ESP32-S3-DevKitC-1 has a lot of GPIOs, but not every pin is equally convenient to use. Some pins affect boot, some are shared with native USB or debugging, and GPIO35–37 may be unavailable depending on the flash and PSRAM configuration…
The ESP32-S2-DevKitC-1 is Espressif’s entry-level development board for the ESP32-S2 – a single-core Wi-Fi microcontroller with native USB, 43 GPIOs, ADC, DAC, touch, and a rich set of peripherals. This guide focuses on pinout and GPIO selection for the DevKitC-1,…
ESP32 DevKitC V4 and ESP-WROOM-32 Overview The ESP32 DevKitC V4 pinout breaks most usable ESP32 signals out to two 19-pin headers. For dependable projects, start with GPIO4, GPIO13, GPIO14, GPIO18, GPIO19, GPIO21, GPIO22, GPIO23, GPIO25, GPIO26, GPIO27, GPIO32 and GPIO33.…
A wall-mounted ESP32 room controller with a small display and a few buttons can replace several physical thermostats and remotes: This guide shows how to build an ESP32-based room controller with: 1. Hardware Required 2. Suggested Pinout Buttons are wired:…
This guide explains: Most ESP32 projects are powered from USB adapters and run 24 battery-powered sensors, that approach kills the battery in a few hours. To build long-lasting wireless sensors (temperature, humidity, leak, motion, etc.) running on 18650 cells or…
An ESP32 can easily replace five separate smart sensors with a single multi-sensor node that sends everything to Home Assistant: All fully local, no cloud, and powered from a single USB supply. This guide shows how to build an all-in-one…