diff --git a/firmware/cyd/media/preview.html b/firmware/cyd/media/preview.html
new file mode 100644
index 0000000..48ad6c4
--- /dev/null
+++ b/firmware/cyd/media/preview.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>LCD1602A</title>
+<style>
+
+  *{box-sizing:border-box;margin:0;padding:0}
+  html,body{width:320px;height:240px;overflow:hidden;background:#000;margin:0}
+  .bezel{width:320px;height:240px;background:#1a1408}
+  .screen{width:320px;height:240px;background:#0A1016;color:#EAF0F6;font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden}
+  .muted{color:#7A8B9C}.ok{color:#3DDC97}.bad{color:#E85D4C}.acc{color:#4FC3F7}.amber{color:#FFB74D}
+  .btn{border:0;border-radius:8px;background:#243140;color:#EAF0F6;font-weight:600}
+  .btn.acc{background:#1A4A6E}.btn.on{background:#1B5E4A}.btn.warn{background:#6B3A1E}
+
+
+  .t{position:absolute;left:0;right:0;top:2px;text-align:center;font-size:24px;font-weight:700}
+  .pin{position:absolute;left:0;right:0;top:34px;text-align:center;font-size:11px}
+  .st{position:absolute;left:0;right:0;top:52px;text-align:center;font-weight:700}
+  .warn{position:absolute;left:8px;right:8px;top:72px;text-align:center;font-size:11px;color:#FFB74D}
+  .line{position:absolute;left:24px;right:24px;height:22px;background:#0d1820;border:1px solid #1E2C40;border-radius:4px;
+    color:#7CDBFF;font-family:ui-monospace,monospace;padding:2px 8px;display:flex;align-items:center}
+  .l1{top:96px}.l2{top:122px}
+  .grid{position:absolute;left:12px;right:12px;bottom:10px;display:grid;grid-template-columns:1fr 1fr;gap:8px}
+  .grid .btn{height:36px}
+
+</style>
+</head>
+<body>
+<div class="bezel"><div class="screen" id="s">
+
+  <div class="t">LCD1602A</div>
+  <div class="pin muted">I2C  SDA22  SCL27  PCF8574</div>
+  <div class="st ok">OK 0x27  map0</div>
+  <div class="warn">Blank? turn BLUE pot on backpack</div>
+  <div class="line l1">[Hello World!]</div>
+  <div class="line l2">[LCD1602A]</div>
+  <div class="grid">
+    <button class="btn" type="button">Demo 1/4</button>
+    <button class="btn" type="button">Hello</button>
+    <button class="btn" type="button">Map 0</button>
+    <button class="btn on" type="button">BL ON</button>
+  </div>
+
+</div></div>
+</body>
+</html>
diff --git a/firmware/cyd/meta.json b/firmware/cyd/meta.json
index 35fa2f1..9f90216 100644
--- a/firmware/cyd/meta.json
+++ b/firmware/cyd/meta.json
@@ -3,5 +3,16 @@
   "name": "CYD LCD1602A",
   "summary": "LCD1602A HD44780 via PCF8574 I2C: SDA GPIO22, SCL GPIO27 — demo / hello / map / backlight; contrast = blue pot only",
   "description": "SoftSPI touch + LVGL. LCD1602A character LCD on I2C backpack (scan 0x27/0x3F). Contrast is hardware pot (Vo), not software. Backlight off usually unreadable on blue/white modules.",
-  "tags": ["lcd1602a", "hd44780", "pcf8574", "i2c", "display", "touch", "lvgl"]
+  "tags": [
+    "lcd1602a",
+    "hd44780",
+    "pcf8574",
+    "i2c",
+    "display",
+    "touch",
+    "lvgl"
+  ],
+  "media": {
+    "preview": "media/preview.html"
+  }
 }