ESP-NOW Integration for ESPHomE

ESP_RC IS NOW A STANDALONE LIBRARY AND HAS BEEN MOVED TO https://github.com/iphong/lib-esp-rc

THIS REPO WILL ONLY FOCUS ON ESPHOME & HOMEASSISTANT INTEGRATION

This addon allow direct communication between your esphome devices.

The Problem

• EspHome is no doubt the best platform for creating your own DIY smart devices, but it requires a WiFi router and HomeAssistant in order to communicate.

Other solutions

• Using BT, RF or IR module, but this requires additional hardwares

Why esp-now?

• Works with or without WiFi connection
• Works with or without HomeAssistant
• Instant startup time if not using wifi
• No addition hardware needed
• Easy to use pub/sub event model
• Send and receive from multiple devices

Usage examples

ATTENTION: Make sure to use the latest arduino version as this uses the new esp-now broadcast feature. And it's recommended to use the same channel as your wifi router.

1. A main device contains simple gpio switch and a light

esphome:
  ...
  arduino_version: LATEST
  includes:
  - esp_now_connect.h

output:
- platform: gpio
  pin: 13
  id: my_output

light:
- platform: binary
  output: my_output
  id: my_light
  name: My Light

switch:
- platform: gpio
  pin: 12
  id: my_switch
  on_turn_on:
  - lambda: EspRC.send("my_switch on");
  on_turn_off:
  - lambda: EspRC.send("my_switch off");

custom_component:
- lambda: |-
    EspRC.begin(2);
    EspRC.on("my_motion on", []() {
      id(my_light)->turn_on().perform();
    });
    EspRC.on("my_motion off", []() {
      id(my_light)->turn_off().perform();
    });
    EspRC.on("status my_switch", []() {
      if (id(my_switch).state) {
        EspRC.send("my_switch on");
      } else {
        EspRC.send("my_switch off");
      }
    });
    return {};

2. A second device contains a motion sensor

esphome:
  ...
  arduino_version: LATEST
  includes:
  - esp_now_connect.h

binary_sensor:
- platform: gpio
  pin: 2
  id: my_motion
  on_press:
  - lambda: EspRC.send("my_motion on");
  on_release:
  - lambda: EspRC.send("my_motion off");

custom_component:
- lambda: |-
    EspRC.begin(2);
    return {};

3. A third device contains a LED state indicator of the switch on device 1

esphome:
  ...
  arduino_version: LATEST
  includes:
  - esp_now_connect.h

output:
- platform: gpio
  pin: 13
  id: my_output

light:
- platform: binary
  output: my_output
  id: my_light
  name: My Light

custom_component:
- lambda: |-
    EspRC.begin(2);
    EspRC.on("my_switch on", []() {
      id(my_light)->turn_on().perform();
    });
    EspRC.on("my_switch off", []() {
      id(my_light)->turn_off().perform();
    });
    EspRC.send("status my_switch");
    return {};

CHANGE LOGS:

Update 1:

1. To prevent conflict with EspRC namespace, i will use the namespace EspRC instead.
2. You can now receive and send message with arguments but this method is having performance issues.

EspRC.on("bedroom light", [](String state) {
  if (state.equals("on")) {
    // do something
  } else {
    // do some thing else
  }
});
EspRC.on("bedroom temp", [](Int value) {
  // Do something with int value
});
EspRC.send("bedroom light", "on");
EspRC.send("bedroom temp", 28);

Update 2:

1. A different way to get data. This method works better than the previous update

EspRC.on("bedroom light", []() {
  String state = EspRC.getValue();
  if (state.equals("on")) {
    // do something
  } else {
    // do some thing else
  }
});
EspRC.on("bedroom temp", []() {
  Int value = EspRC.getValue().toInt();
  // Do something with int value
});
EspRC.send("bedroom light", "on");
EspRC.send("bedroom temp", 28);

What's next

• Adding PSK encryption support
• Adding ESP32 support
• Sending typed data as argument
• Sending to a specific peer
• and much more...

Acknowledgments

This project is part of my smarthome project that build entirely with esphome. There are more real life examples you might want to check it out at https://github.com/iphong/ha-config.

You are free to use and modify these code to better fit your project.

Cheers!!