/ESP32-ESPNOW-Examples

ESP32 ESP-NOW Wireless Weather Station: A simple, reliable, and energy-efficient ESP32 project that demonstrates how to use the built-in ESP-NOW protocol to transmit BME280 sensor data wirelessly between ESP32 boards without WiFi, Bluetooth, or external RF modules.

Primary LanguageC++

ESP32 ESP-NOW Wireless Weather Station

Overview

This project demonstrates the power of ESP-NOW wireless protocol using ESP32 microcontrollers. Unlike traditional wireless communication methods (NRF, Bluetooth, 433MHz, WiFi), ESP-NOW offers a simpler, more reliable, and energy-efficient way to connect ESP devices. The project creates a wireless weather station that transmits real-time temperature, humidity, and pressure data from a BME280 sensor to a receiver ESP32 connected to a 2.8" ILI9341 display.

The project includes both basic ESP-NOW communication examples and a complete weather station implementation, all using a custom ESPNowEasy wrapper class that simplifies the wireless communication process.

Repository Structure

The repository contains two main folders:

  1. Basic Example - Simple sender and receiver code to demonstrate ESP-NOW communication fundamentals
  2. Weather Station - Complete implementation of the wireless weather station with sensor integration and display

Features

  • ESP-NOW Protocol: Lightweight, connectionless wireless communication built directly into ESP32
  • Broadcasting Mode: Send data to any listening ESP32 without complex pairing
  • Low Power Consumption: Ideal for battery-powered applications
  • Real-Time Sensor Data: Stream temperature, humidity, and barometric pressure readings
  • Custom ESPNowEasy Wrapper: Simplifies ESP-NOW usage with just a few lines of code
  • Cross-Device Compatibility: Works between different ESP32 models (tested with ESP32 and ESP32-S3)
  • Reliable Range: Consistent connectivity throughout a typical home environment

Video Tutorial

ESPNOW Weather Station

🎥 Watch the Full Video Tutorial

Parts List

Here are the components you need for this build:

Component Description Buy Link
ESP32 Transmitter microcontroller Buy Here
ESP32S3 Receiver microcontroller (optional, regular ESP32 also works) Buy Here
BME280 Sensor for temperature, humidity, and barometric pressure Buy Here
2.8" ILI9341 Display Screen for displaying sensor readings Buy Here

Project Structure

The repository includes two main examples:

  1. Basic ESP-NOW Communication:

    • Simple sender that broadcasts a counter and "Hello World" message
    • Receiver that displays the incoming data on the Serial Monitor

  2. Wireless Weather Station:

    • Transmitter with BME280 sensor
    • Receiver with 2.8" ILI9341 display showing real-time weather data

Software Components

The project uses a custom wrapper for ESP-NOW:

  • ESPNowEasy.h & ESPNowEasy.cpp – Custom wrapper class that simplifies ESP-NOW communication
  • Transmitter Sketches – For both basic example and weather station
  • Receiver Sketches – For both basic example and weather station display

How to Use

  1. Download and include the ESPNowEasy files in your Arduino project
  2. Define your data structure (what you want to send)
  3. Create an ESPNowEasy object with your data structure
  4. Initialize with espNow.begin()
  5. Send data with espNow.send(data)
  6. For receivers, set up a callback function with espNow.onReceive()

Future Improvements

  • Extended Range Testing: Exploring ESP-NOW's 400m theoretical range capability
  • Advanced Weather Station: Upcoming project with additional features and sensors

License & Open Source Contribution

This project is fully open source, and contributions are welcome! Feel free to expand the functionality and share your modifications.

🛠 Built by Nick Koumaris 📺 Follow me on YouTube for more projects!