diff --git a/firmware/export_from_build.ps1 b/firmware/export_from_build.ps1
index 44a1f80..57ebabf 100644
--- a/firmware/export_from_build.ps1
+++ b/firmware/export_from_build.ps1
@@ -1,26 +1,43 @@
-# Rebuild (optional) and refresh firmware/cyd_28r from PlatformIO build output.
-# Usage:
-#   .\firmware\export_from_build.ps1
-#   .\firmware\export_from_build.ps1 -SkipBuild
+# Export firmware bins from PlatformIO build.
+# Default: 2.8" (cyd_28r -> firmware/cyd_28r)
+# 3.5":    .\firmware\export_from_build.ps1 -Env cyd_35r
+#          (only after: pio run -e cyd_35r)
 
-param([switch]$SkipBuild)
+param(
+  [switch]$SkipBuild,
+  [ValidateSet("cyd_28r", "cyd_35r")]
+  [string]$Env = "cyd_28r"
+)
 
 $ErrorActionPreference = "Stop"
 $root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
 Set-Location $root
 
+$env:Path = "C:\Users\dsx2016\AppData\Local\Programs\Python\Python312\Scripts;" + $env:Path
+
 if (-not $SkipBuild) {
-  pio run -e cyd_28r
+  pio run -e $Env
   if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 }
 
-$src = Join-Path $root ".pio\build\cyd_28r"
-$dst = Join-Path $root "firmware\cyd_28r"
+$src = Join-Path $root (".pio\build\" + $Env)
+if ($Env -eq "cyd_35r") {
+  $dstName = "cyd_35r"
+  $boardLine = "board: ESP32-3248S035 (ST7796)"
+  $boardIdHint = "esp32-3248s035"
+} else {
+  $dstName = "cyd_28r"
+  $boardLine = "board: ESP32-2432S028R (ILI9341)"
+  $boardIdHint = "esp32-2432s028"
+}
+$dst = Join-Path $root ("firmware\" + $dstName)
 New-Item -ItemType Directory -Force -Path $dst | Out-Null
 
-Copy-Item (Join-Path $src "bootloader.bin") $dst -Force
-Copy-Item (Join-Path $src "partitions.bin") $dst -Force
-Copy-Item (Join-Path $src "firmware.bin") $dst -Force
+foreach ($f in @("bootloader.bin", "partitions.bin", "firmware.bin")) {
+  $p = Join-Path $src $f
+  if (-not (Test-Path $p)) { Write-Error "Missing build artifact: $p — build with: pio run -e $Env" }
+  Copy-Item $p $dst -Force
+}
 
 $bootApp = Join-Path $env:USERPROFILE ".platformio\packages\framework-arduinoespressif32\tools\partitions\boot_app0.bin"
 if (-not (Test-Path $bootApp)) {
@@ -28,15 +45,15 @@ if (-not (Test-Path $bootApp)) {
 }
 Copy-Item $bootApp (Join-Path $dst "boot_app0.bin") -Force
 
-$git = (git -C $root rev-parse --short HEAD).Trim()
+$git = ""
+try { $git = (git -C $root rev-parse --short HEAD).Trim() } catch { $git = "unknown" }
 $date = Get-Date -Format "yyyy-MM-dd"
-$hashes = Get-FileHash (Join-Path $dst "*.bin") -Algorithm SHA256
+$hashes = Get-ChildItem (Join-Path $dst "*.bin") | Get-FileHash -Algorithm SHA256
 $lines = @(
-  "name: CYD climate dashboard (cyd_28r)",
+  "name: CYD temperature ($dstName)",
   "git: $git",
   "date: $date",
-  "board: ESP32-2432S028R (ILI9341)",
-  "dht: GPIO22",
+  $boardLine,
   "flash_size: 4MB",
   "offsets:",
   "  0x1000  bootloader.bin",
@@ -49,4 +66,22 @@ foreach ($h in $hashes) {
   $lines += ("  {0,-15} {1}" -f (Split-Path $h.Path -Leaf), $h.Hash)
 }
 $lines | Set-Content -Encoding utf8 (Join-Path $dst "VERSION.txt")
-Write-Host "Exported -> $dst (git $git)"
+
+# Keep / refresh meta.json boardId for catalog filtering
+$metaPath = Join-Path $dst "meta.json"
+if (Test-Path $metaPath) {
+  try {
+    $meta = Get-Content $metaPath -Raw | ConvertFrom-Json
+    $meta.boardId = $boardIdHint
+    if ($Env -eq "cyd_35r" -and $meta.name -notmatch "3\.5") {
+      $meta.name = ($meta.name -replace "\s*$","") + " (3.5\")"
+    }
+    $meta | ConvertTo-Json -Depth 8 | Set-Content -Encoding utf8 $metaPath
+  } catch {
+    Write-Host "meta.json update skipped: $_"
+  }
+} elseif ($Env -eq "cyd_35r") {
+  Write-Host "Note: add firmware/cyd_35r/meta.json with boardId=$boardIdHint for the web catalog"
+}
+
+Write-Host "Exported -> $dst (env=$Env git=$git)"
diff --git a/platformio.ini b/platformio.ini
index 1a9833a..ee58296 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1,4 +1,4 @@
-; CYD ESP32-2432S028R — LVGL 温湿度仪表盘
+; CYD ESP32-2432S028R �?LVGL 温湿度仪表盘
 ; DHT11 DATA -> GPIO22
 
 [platformio]
@@ -46,12 +46,12 @@ build_flags =
   -D LV_CONF_INCLUDE_SIMPLE=1
   -I include
 
-; 标准 CYD 2.8" 电阻屏 (ILI9341)
+; 标准 CYD 2.8" 电阻�?(ILI9341)
 [env:cyd_28r]
 build_flags =
   ${env.build_flags}
 
-; 颜色反相版本（若画面色偏/发白可改用此环境）
+; 颜色反相版本（若画面色偏/发白可改用此环境�?
 [env:cyd_28r_inv]
 build_flags =
   ${env.build_flags}
@@ -65,3 +65,19 @@ build_flags =
   -D ST7789_DRIVER=1
   -D TFT_RGB_ORDER=TFT_BGR
   -D TFT_INVERSION_ON=1
+
+; Optional 3.5" CYD ESP32-3248S035 (ST7796 resistive). Default remains cyd_28r.
+; Build: pio run -e cyd_35r
+[env:cyd_35r]
+build_flags =
+  ${env.build_flags}
+  -U ILI9341_2_DRIVER
+  -D ST7796_DRIVER=1
+  -U TFT_WIDTH
+  -U TFT_HEIGHT
+  -D TFT_WIDTH=320
+  -D TFT_HEIGHT=480
+  -U TFT_BL
+  -D TFT_BL=27
+  -D CYD_BOARD_3248S035=1
+
diff --git a/src/main.cpp b/src/main.cpp
index a290179..ecee504 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,7 +11,11 @@
 #include <math.h>
 
 #define DHT_PIN 22
+#if defined(CYD_BOARD_3248S035)
+#define TFT_BL_PIN 27
+#else
 #define TFT_BL_PIN 21
+#endif
 
 #define XPT2046_IRQ 36
 #define XPT2046_MOSI 32
@@ -19,8 +23,13 @@
 #define XPT2046_CLK 25
 #define XPT2046_CS 33
 
+#if defined(CYD_BOARD_3248S035)
+#define SCREEN_WIDTH 480
+#define SCREEN_HEIGHT 320
+#else
 #define SCREEN_WIDTH 320
 #define SCREEN_HEIGHT 240
+#endif
 #define DHT_READ_MS 2500
 #define DHT_FAIL_TOLERANCE 3
 #define EMA_ALPHA 0.35f
@@ -28,16 +37,29 @@
 #define DRAW_BUF_SIZE (SCREEN_WIDTH * SCREEN_HEIGHT / 10 * (LV_COLOR_DEPTH / 8))
 
 /* Layout grid — every region has exclusive space, no overlaps */
+#if defined(CYD_BOARD_3248S035)
+#define UI_M 10
+#define UI_G 10
+#define UI_HDR_H 32
+#define UI_GAUGE_H 168
+#define UI_GAUGE_W 225
+#define UI_ARC 120
+#else
 #define UI_M 6
 #define UI_G 6
-#define UI_HDR_H 22   /* single-row header; must clear before gauges */
+#define UI_HDR_H 22
 #define UI_GAUGE_H 124
 #define UI_GAUGE_W 151
 #define UI_ARC 90
+#endif
 #define UI_BOT_Y (UI_HDR_H + UI_G + UI_GAUGE_H + UI_G) /* 158 */
 #define UI_BOT_H (SCREEN_HEIGHT - UI_BOT_Y - UI_M)      /* 76 */
 #define UI_BOT_W (SCREEN_WIDTH - 2 * UI_M)              /* 308 */
+#if defined(CYD_BOARD_3248S035)
+#define UI_INFO_W 180
+#else
 #define UI_INFO_W 124
+#endif
 #define UI_CHART_W (UI_BOT_W - 12 - UI_INFO_W - UI_G)   /* ~160 */
 
 static const lv_color_t COL_BG = lv_color_hex(0x0A1018);
@@ -566,7 +588,11 @@ void setup() {
   touchscreen.begin(touchscreenSPI);
   touchscreen.setRotation(2);
 
+  #if defined(CYD_BOARD_3248S035)
+  lv_display_t *disp = lv_tft_espi_create(320, 480, draw_buf, sizeof(draw_buf));
+#else
   lv_display_t *disp = lv_tft_espi_create(240, 320, draw_buf, sizeof(draw_buf));
+#endif
   lv_display_set_rotation(disp, LV_DISPLAY_ROTATION_270);
 
   lv_indev_t *indev = lv_indev_create();