(Universal method — works with any ESP8266 board) ESP-NOW is one of the fastest and most reliable ways to send data wirelessly between ESP32/ESP8266 devices.Unlike Wi-Fi or MQTT, it requires no router, no pairing, and has almost zero latency (1–3…
Passive Infrared (PIR) motion sensors are one of the simplest and most effective ways to detect motion in a room. Combined with an ESP32, they provide extremely fast, local, cloud-free motion detection that integrates perfectly with Home Assistant. This guide…
The DS18B20 is one of the most robust and accurate digital temperature sensors for: It uses a 1-Wire protocol, allowing multiple sensors on the same wire, making it perfect for home automation. This guide includes two methods: 1. Parts Required…
The SHT45 is currently one of the most accurate temperature and humidity sensors available.It offers laboratory-grade precision, ultra-low power consumption, and very stable measurements. This guide shows you how to connect an ESP32 + SHT45 to Home Assistant using two…
Real-time energy monitoring is one of the most valuable additions to a smart home. The PZEM-004T module provides accurate measurements of: When combined with an ESP32, it offers a powerful, inexpensive way to send energy data directly into Home Assistant.…
ESP32 microcontrollers include multiple hardware timers that can trigger interrupts with microsecond precision. This makes them perfect for generating pulses, reading sensors, simulating RPM or speed signals, or scheduling tasks without blocking the loop(). In this article, we walk through…
The BME280 is one of the easiest sensors to integrate into Home Assistant for live temperature, humidity, and pressure monitoring. In this guide, we show you how to install the sensor, flash the ESP32, configure MQTT, and view the readings…
A simple example of sending multiple integers from one board to another The I2C (Inter-Integrated Circuit) bus allows two wires—SDA and SCL—to connect multiple devices.Each device can act as a master, slave, or both. In most projects, one board sends…
I2C is one of the simplest ways to connect multiple sensors and peripherals to your ESP32 using only two wires (SDA and SCL). When debugging a new project, the first thing you should do is scan the I2C bus and…
Send Sensor Data With Zero Assumptions • Exact Steps • Fully Reliable This guide shows exactly how to send readings (e.g., BME280 temperature/humidity/pressure) from your ESP32 to Home Assistant using MQTT. Everything is simple, direct, and tested. 1. What You…