For complete project details (schematics + source code), visit  ► https://RandomNerdTutorials.com/esp-now-two-way-communication-esp32/
Getting Started with ESP-NOW on ESP32  ► https://RandomNerdTutorials.com/esp-now-esp32-arduino-ide/
Getting Started with ESP-NOW on ESP8266  ► https://RandomNerdTutorials.com/esp-now-esp8266-nodemcu-arduino-ide/

ESP-NOW is a fast connectionless communication protocol developed by Espressif that features short packet transmission and allows multiple boards to exchange data without using Wi-Fi.

Learn how to establish a two-way communication between two ESP32 boards using ESP-NOW. As an example, two ESP32 boards will exchange sensor readings (with a range in open field up to 220 meters ~ 722 feet).

This protocol also works with the ESP8266 NodeMCU board and we've tested the communication range between the two boards up to 140 meters (approximately 459 feet) in open field. In this experiment both ESP8266 on-board antennas were pointing to each other.

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Today we will discover a hidden feature to connect two or more ESP32s or ESP8266s directly to each other: ESP-now. It is much faster and more energy efficient. And we will compare it to LoRa (RFM95 and Arduino Pro Mini.

Espressif gave us this possibility and, because it is so fast, they called it ESPnow. And it also works in the Arduino IDE.
In this video, we will
- Try to understand the difference between the standard ESP mode and ESPnow
- Build a working ESPnow connection for two ESP8266
- Check-out the transmission speed and
- Compare this speed with the speed if we connect the ESP to the internet
- Compare the Energy hunger of both modes
- And finally, compare the ESPs with another technology: LoRa

Links:
Sketches: https://github.com/SensorsIot/ESP-Now-Tests
ESP-Now example: https://github.com/HarringayMakerSpace/ESP-Now
Not-rebooting gateway: https://github.com/HarringayMakerSpace/IoT/blob/master/ESP-Now/espnow-gateway/espnow-gateway.ino
Online Battery life calculator: http://battery-life.of-things.de/battery…