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Echo Show 5 (2nd gen, "cronos") as a Home Assistant wall/desk kiosk: screen follows presence, CPU and memory tuning

A field guide for an Echo Show 5 (2021) running unofficial LineageOS 18.1 with the Home Assistant Companion app, used as an always-on dashboard that is on only while someone is in the room. Everything below was tested on one unit; where something is untested it says so.

What you get:

• Real screen-off when the room is empty, screen-on (dashboard in front, no lock screen) when someone is there, driven entirely from Home Assistant.
• An optional notification sound, and an optional "peek" (wake for 2 minutes) for important events.
• A re-runnable ADB script that applies the kiosk settings, trims the system and installs a boot file with CPU/memory tuning.
• The hardware findings (no proximity sensor, no camera, the one sensor it has) so you don't repeat the investigation.

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blueprint:
  name: "Dynamic Light Brightness (Lux Based)"
  description: >
    This blueprint dynamically adjusts a light's brightness to complement the ambient light levels detected by an illuminance (lux) sensor.

    It maps a defined range of lux values (from a minimum to a maximum) to a corresponding brightness range (e.g., 10 lux → 10% brightness, 500 lux → 100% brightness). The brightness is calculated using linear interpolation, ensuring smooth transitions as the ambient light changes.

    The automation is only active when the target light is already turned on.

    **Key Features:**

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package com.example

import androidx.compose.runtime.Composable
import androidx.compose.ui.platform.LocalInspectionMode
import com.google.accompanist.permissions.ExperimentalPermissionsApi
import com.google.accompanist.permissions.PermissionState
import com.google.accompanist.permissions.PermissionStatus

/**
 * Wrapper for [com.google.accompanist.permissions.rememberPermissionState] to grant permissions when in Inspection mode

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@Composable
fun CameraPreview(
    modifier: Modifier = Modifier,
    scaleType: PreviewView.ScaleType = PreviewView.ScaleType.FILL_CENTER,
    cameraSelector: CameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA
) {
    val lifecycleOwner = LocalLifecycleOwner.current
    AndroidView(
        modifier = modifier,
        factory = { context ->

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#!/usr/bin/python

import http.client
import httplib2
import os
import random
import sys
import time

from apiclient.discovery import build

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package com.example

import android.content.Context
import android.nfc.tech.MifareClassic

object NfcUtils {

    fun Context.isMifareClassicCompatible(): Boolean =
        packageManager.systemAvailableFeatures.any { it.name == "com.nxp.mifare" }

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package com.example

import android.app.Activity
import android.nfc.NfcAdapter
import android.nfc.Tag
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.LifecycleOwner

class NfcTagLifecycleObserver(
    private val activity: Activity,

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package com.example

import io.reactivex.rxjava3.disposables.Disposable
import io.reactivex.rxjava3.exceptions.CompositeException
import io.reactivex.rxjava3.exceptions.Exceptions
import io.reactivex.rxjava3.internal.util.ExceptionHelper

/**
 * A disposable that can hold onto multiple other Disposables
 * and only keeps the last Disposable added with the same key.

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package com.example

import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Rect
import android.graphics.Typeface
import android.text.TextPaint
import android.util.AttributeSet
import com.google.android.material.textfield.TextInputEditText

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import android.graphics.ImageFormat
import android.graphics.Rect
import android.graphics.YuvImage
import android.media.Image
import com.bumptech.glide.Priority
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.data.DataFetcher
import java.io.ByteArrayOutputStream
import java.nio.ByteBuffer