Home-Assistant-4-Channel-Relay-With-Physical-Button-Using-Arduino-and-MQTT

4 channel relay with physical button control, implemented using Arduino, NodeMCU, MQTT and Home Assistant.

What it Does?

1. 4 Channel Relay control with Home Assistant app/desktop
2. If you perform ON/OFF with Physical/Push button switch, the status gets updated on Home Assistant app/desktop
3. If Internet is not available, you can still operate Relay with offline physical switch

Requirements

1. NodeMCU
2. 4 Channel Relay Module
3. Home Assistant App

Installation

• Open secret.h and change Wifi settings, server settings and few other parameters as per your project requirement.
• Open settings.h - Usually you don't need to change any values here, but if you need any customization feel free play with it.

Hardware Connection

NodeMCU to 4 Channel Relay Module Connection

D0 or 16 to IN1 D1 or 5 to IN2 D2 or 4 to IN3 D3 or 0 to IN4 VV to VCC GND to GND

NodeMCU Connection for Switch Actions (NodeMCU to NodeMCU)

D4 or 2 to GND (in NodeMCU) D5 or 14 to GND (in NodeMCU) D6 or 12 to GND (in NodeMCU) D7 or 13 to GND (in NodeMCU)

Home Assistant Configuration

Add in configuration.yaml

homeassistant:
  customize: 
      switch.bed_light:
        icon: mdi:ceiling-light 
        assumed_state: false
      switch.backside_light:
        icon: mdi:lightbulb 
        assumed_state: false
      switch.front_light:
        icon: mdi:lightbulb-outline
        assumed_state: false
      switch.fan:
        icon: mdi:fan
        assumed_state: false
      switch.room_firmware_update:
        assumed_state: false

switch 1:
  - platform: mqtt
    name: "Bed Light"
    state_topic: "/house/room/confirmbedlight/"
    command_topic: "/house/room/bedlight/"
    payload_on: "1"
    payload_off: "0"
    optimistic: true
    qos: 0

switch 2:
  - platform: mqtt
    name: "Backside Light"
    state_topic: "/house/room/confirmbacksidelight/"
    command_topic: "/house/room/backsidelight/"
    payload_on: "1"
    payload_off: "0"
    optimistic: true
    qos: 0

switch 3:
  - platform: mqtt
    name: "Fan"
    state_topic: "/house/room/confirmfan/"
    command_topic: "/house/room/fan/"
    payload_on: "1"
    payload_off: "0"
    optimistic: true
    qos: 0

switch 4:
  - platform: mqtt
    name: "Front Light"
    state_topic: "/house/room/confirmfrontlight/"
    command_topic: "/house/room/frontlight/"
    payload_on: "1"
    payload_off: "0"
    optimistic: true
    qos: 0

  - platform: mqtt
    name: "Room Firmware Update"
    state_topic: "/house/room/confirmfirmware/"
    command_topic: "/house/room/firmware/"
    payload_on: "1"
    payload_off: "0"
    optimistic: true
    qos: 0 

Add in sensors.yaml

  - platform: mqtt
    name: "Room Build Number"
    state_topic: "/house/room/firmware/confirmbuildnumber/"
    value_template: '{{ value_json.buildNumber }}'

Add in groups.yaml

  sensors_mqtt_group:
  name: Build Number
  entities:
    - sensor.build_number

Add in automations.yaml

#Add this if you want to use automation #Example code is shown for only 1 switch

- id: TurnOn
  alias: Turn On Switch
  trigger:
  - at: '21:50:00'
    platform: time
  action:
  - entity_id: switch.mqtt_switch_1
    service: switch.toggle

Software Setup

• Download and install the Home Assistant App for iOS or Android.
• Download this repo and copy the files in to your sketches directory. Open the sketch in Arduino IDE.
• Go to the settings.h tab. This is where all the customisable settings are. You should be able to change almost everything from there before compiling.
• Go to the secret.h tab. Here you change Wifi settings, server settings and few other parameters as per your project requirement.

Screenshot