Home Assistant: Auto-Dim the Xiaomi TV Backlight Every Evening

home-assistant-xiaomi-tv.md

Home Assistant: Auto-Dim the Xiaomi TV Backlight Every Evening

Suppose we're running Home Assistant on macOS...

1. Install Rancher Desktop in Docker Mode (Moby):

   • Install Rancher Desktop

   • In Rancher Desktop, click "Settings"...

     Set "Container Engine" to "dockerd (moby)"

     Under "Kubernetes", uncheck "Enable Kubernetes"

     (To reduce CPU Utilisation)

2. Install Home Assistant as a Docker Container

   mkdir $HOME/home-assistant
   
   docker run -d \
     --name homeassistant \
     --privileged \
     --restart=unless-stopped \
     -e TZ=Asia/Singapore \
     -v $HOME/home-assistant:/config \
     -v /run/dbus:/run/dbus:ro \
     --network=host \
     ghcr.io/home-assistant/home-assistant:stable
   
   # If we need to snoop around the Docker Container, do this:
   docker exec homeassistant ps -a     

3. Browse to Home Assistant for the Initial Configuration: http://localhost:8123

4. Add this to the Home Assistant Config: $HOME/home-assistant/configuration.yaml

   # Shell Commands to set the Xiaomi TV Backlight.
   # They will be accessible as Shell Commands `tv_bright` and `tv_dim`
   # We'll call them in our Automated Scheduled Tasks
   # https://www.home-assistant.io/integrations/shell_command/
   
   shell_command:
     tv_bright: ./tv-bright.sh
     tv_dim: ./tv-dim.sh
   
   # Virtual Switch to set the Xiaomi TV Backlight.
   # This will appear in the Home Assistant UI as a Home Automation Device.
   # So humans can click the Virtual Switch to flip the Backlight On and Off.
   # https://www.home-assistant.io/integrations/command_line/
   
   command_line:
     - switch:
         name: TV Backlight
         command_on: ./tv-bright.sh
         command_off: ./tv-dim.sh

5. Restart Home Assistant to effect the changes:

   Menu > Developer Tools > Check Configuration > Restart

6. In Home Assistant Settings: Add 2 Automations...

   Menu > Settings > Automations > Create Automation

   • When Time is 7pm: Then Do Shell Command tv_dim

   • When Time is 7am: Then Do Shell Command tv_bright

7. We'll control Xiaomi TV via the HTTP API...

Create the Shell Script to Dim the TV Backlight: $HOME/home-assistant/tv-dim.sh

#!/bin/bash
## Shell Script to Dim the Xiaomi TV Backlight via HTTP API

set -e  #  Exit when any command fails
set -x  #  Echo commands

## IP Address of Xiaomi TV
ip=192.168.31.8

## Select `Menu > Display`
curl "http://$ip:6095/controller?action=keyevent&keycode=menu"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=up"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=up"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=enter"
sleep 0.1

## Select `Backlight`
curl "http://$ip:6095/controller?action=keyevent&keycode=down"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=down"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=enter"
sleep 0.1

## Decrease the Backlight Level from 99 to 1
for i in {1..100}
do
  curl "http://$ip:6095/controller?action=keyevent&keycode=left"
  sleep 0.1
done

Create the Shell Script to Brighten the TV Backlight: $HOME/home-assistant/tv-bright.sh

#!/bin/bash
## Shell Script to Brighten the Xiaomi TV Backlight via HTTP API

set -e  #  Exit when any command fails
set -x  #  Echo commands

## IP Address of Xiaomi TV
ip=192.168.31.8

## Select `Menu > Display`
curl "http://$ip:6095/controller?action=keyevent&keycode=menu"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=up"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=up"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=enter"
sleep 0.1

## Select `Backlight`
curl "http://$ip:6095/controller?action=keyevent&keycode=down"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=down"
sleep 0.1
curl "http://$ip:6095/controller?action=keyevent&keycode=enter"
sleep 0.1

## Increase the Backlight Level from 1 to 99
for i in {1..100}
do
  curl "http://$ip:6095/controller?action=keyevent&keycode=right"
  sleep 0.1
done