diff --git a/README.md b/README.md
index b7a70cd..536d14c 100644
--- a/README.md
+++ b/README.md
@@ -1,31 +1,30 @@
-# 轻触开关计数（CYD）
+# 三脚按键模块计数（CYD）
 
-触控 + LVGL 参考 `hw269test`。GPIO22 读 **轻触带帽开关**：每按一次，屏幕计数 +1。
+GPIO22 读三脚轻触按键模块：每按一次，屏幕计数 +1。
 
 ## 硬件
 
 | 项目 | 说明 |
 |------|------|
 | 板子 | CYD ESP32-2432S028R |
-| 开关 | 轻触开关（带帽），瞬时闭合 |
-| 引脚 | **GPIO22** |
+| 模块 | 三脚轻触按键（VCC / GND / OUT） |
+| 输出 | **GPIO22** |
 
-### 接线（重要）
+### 接线
 
-```
-GPIO22 ── 开关一脚
-GND    ── 开关另一脚
-```
+| 模块 | CYD |
+|------|-----|
+| VCC / 3.3V | **3.3V** |
+| GND | **GND** |
+| OUT / S / DO | **GPIO22** |
 
-- 不要接 3.3V / VCC
-- **四脚轻触**：矩形四脚中，同侧两脚内部常通；要接 **对角** 或 **能通断的一对**，不要接已经常通的那一对
-- 固件内部上拉：松开=HIGH，按下=LOW
+开机自动采空闲电平，反相视为按下（兼容「按下变高」或「按下变低」）。
 
-屏上会显示 `GPIO22: HIGH/LOW`：按下应变为 **LOW**；若一直 HIGH，多半是接线或脚对选错。
+屏上 `OUT HIGH/LOW` 与 `act=`：按下时 OUT 应变到 `act` 那一侧并 +1。
 
 ## 操作
 
-- 按一下开关：计数 +1
+- 按一下：计数 +1（上电时请勿按住）
 - 触控 **Reset**：清零
 
 ## 构建
@@ -33,10 +32,3 @@ GND    ── 开关另一脚
 ```bash
 pio run -e cyd -t upload
 ```
-
-预编译：
-
-```powershell
-cd firmware\cyd
-.\flash.ps1
-```
diff --git a/firmware/cyd/VERSION.txt b/firmware/cyd/VERSION.txt
index de9a100..a5b4b0e 100644
--- a/firmware/cyd/VERSION.txt
+++ b/firmware/cyd/VERSION.txt
@@ -1,8 +1,8 @@
 name: CYD Button (cyd)
-git: 2d1d49c
+git: 280c5ea
 date: 2026-10-23
 board: ESP32-2432S028R (ILI9341)
-features: SoftSPI touch, LVGL, button SIG on GPIO22 count+1
+features: SoftSPI touch, LVGL, 3-pin button OUT on GPIO22 count+1
 flash_size: 4MB
 offsets:
   0x1000  bootloader.bin
@@ -12,5 +12,5 @@ offsets:
 sha256:
   bootloader.bin  3D234A7471F67B013686DABD4DEE7C1FA915C9928463616A94BC9297ACF1ABF8
   boot_app0.bin   F94C5D786A7A8FAB06AC5D10E33BF37711A6697636DC037559EA19CC410A17F0
-  firmware.bin    B57118B1598F34B9737625C04E1EEB6C88395C639017288D69A6AB1BEC0C633C
+  firmware.bin    BFCAD59431009CF5930B228CA7D6E3DE24C5FD2587690D131F770070EC8C604D
   partitions.bin  148B959CBFF1C38AA8E1D5C0BA9D612C54997B945E56A63F41223EEF650653A1
diff --git a/firmware/cyd/firmware.bin b/firmware/cyd/firmware.bin
index 1a07218..2130329 100644
Binary files a/firmware/cyd/firmware.bin and b/firmware/cyd/firmware.bin differ
diff --git a/firmware/cyd/meta.json b/firmware/cyd/meta.json
index d609dc9..77819c6 100644
--- a/firmware/cyd/meta.json
+++ b/firmware/cyd/meta.json
@@ -1,7 +1,7 @@
 {
   "boardId": "esp32-2432s028",
   "name": "CYD Button",
-  "summary": "Button on GPIO22: each press increments on-screen count",
-  "description": "SoftSPI touch + LVGL. SIG->GPIO22 INPUT_PULLUP. Press +1, touch Reset clears.",
+  "summary": "3-pin button module on GPIO22: each press increments count",
+  "description": "SoftSPI touch + LVGL. VCC/GND/OUT->GPIO22. Auto polarity. Press +1, touch Reset clears.",
   "tags": ["button", "gpio22", "touch", "lvgl", "counter"]
 }
diff --git a/firmware/export_from_build.ps1 b/firmware/export_from_build.ps1
index a91959b..24244ee 100644
--- a/firmware/export_from_build.ps1
+++ b/firmware/export_from_build.ps1
@@ -41,7 +41,7 @@ $lines = @(
   "git: $git",
   "date: $date",
   "board: ESP32-2432S028R (ILI9341)",
-  "features: SoftSPI touch, LVGL, button SIG on GPIO22 count+1",
+  "features: SoftSPI touch, LVGL, 3-pin button OUT on GPIO22 count+1",
   "flash_size: 4MB",
   "offsets:",
   "  0x1000  bootloader.bin",
diff --git a/include/button.h b/include/button.h
index 7b596da..0ad43da 100644
--- a/include/button.h
+++ b/include/button.h
@@ -8,5 +8,7 @@ bool button_poll_press();
 uint32_t button_count();
 void button_reset_count();
 bool button_is_down();
-/** 原始电平：1=HIGH，0=LOW（便于接线排查） */
+/** 原始电平：1=HIGH，0=LOW */
 int button_raw_level();
+/** 按下时的有效电平：1=HIGH 有效，0=LOW 有效（开机按空闲电平自动判定） */
+int button_active_level();
diff --git a/include/pins.h b/include/pins.h
index 35b9c4c..86af0f4 100644
--- a/include/pins.h
+++ b/include/pins.h
@@ -10,7 +10,7 @@
 #define CYD_TOUCH_CLK  25
 #define CYD_TOUCH_CS   33
 
-// 轻触开关：一脚 → GPIO22，另一脚 → GND（内部上拉，按下为 LOW）
+// 三脚按键模块 OUT/S → GPIO22（VCC→3.3V，GND→GND）
 #define BTN_PIN 22
 
 #define SCREEN_WIDTH  240
diff --git a/src/button.cpp b/src/button.cpp
index 0678d5a..1cb5faa 100644
--- a/src/button.cpp
+++ b/src/button.cpp
@@ -3,27 +3,44 @@
 
 #include <Arduino.h>
 
-// 轻触开关：一端 → GPIO22，另一端 → GND（内部上拉，按下=LOW）
+// 三脚按键模块：VCC→3.3V，GND→GND，OUT/S→GPIO22
+// 开机采样空闲电平，反相即为“按下”（兼容按下拉高 / 按下拉低两种模块）
 
 static uint32_t g_count = 0;
 static bool g_stable_down = false;
-static int g_stable_raw = HIGH;
+static int g_stable_raw = LOW;
+static int g_active_level = HIGH; // 按下时期望电平
 static uint32_t g_change_ms = 0;
-static int g_pending_raw = HIGH;
+static int g_pending_raw = LOW;
 static bool g_pending = false;
-static constexpr uint32_t DEBOUNCE_MS = 25;
+static constexpr uint32_t DEBOUNCE_MS = 30;
+
+static bool raw_is_down(int raw) { return raw == g_active_level; }
 
 void button_init() {
-  pinMode(BTN_PIN, INPUT_PULLUP);
-  delay(5);
-  g_count = 0;
-  g_stable_raw = digitalRead(BTN_PIN);
-  g_stable_down = (g_stable_raw == LOW);
+  // 模块自带上下拉，不要用内部上拉去顶它
+  pinMode(BTN_PIN, INPUT);
+  delay(30);
+
+  int high_n = 0;
+  for (int i = 0; i < 20; i++) {
+    if (digitalRead(BTN_PIN) == HIGH) {
+      high_n++;
+    }
+    delay(2);
+  }
+  const int idle = (high_n >= 10) ? HIGH : LOW;
+  g_active_level = (idle == HIGH) ? LOW : HIGH;
+  g_stable_raw = idle;
+  g_stable_down = false;
   g_pending = false;
-  g_pending_raw = g_stable_raw;
+  g_pending_raw = idle;
   g_change_ms = millis();
-  Serial.printf("Button tactile GPIO%d pullup, idle=%s (wire other side to GND)\n",
-                BTN_PIN, g_stable_raw == HIGH ? "HIGH" : "LOW");
+  g_count = 0;
+
+  Serial.printf(
+      "Button module GPIO%d INPUT idle=%s active=%s (VCC/GND/OUT)\n", BTN_PIN,
+      idle == HIGH ? "HIGH" : "LOW", g_active_level == HIGH ? "HIGH" : "LOW");
 }
 
 bool button_poll_press() {
@@ -38,12 +55,12 @@ bool button_poll_press() {
     } else if ((now - g_change_ms) >= DEBOUNCE_MS) {
       g_stable_raw = g_pending_raw;
       g_pending = false;
-      const bool down = (g_stable_raw == LOW);
+      const bool down = raw_is_down(g_stable_raw);
       if (down && !g_stable_down) {
         g_stable_down = true;
         g_count++;
-        Serial.printf("Button press count=%lu raw=%d\n", (unsigned long)g_count,
-                      g_stable_raw);
+        Serial.printf("Button press count=%lu raw=%s\n", (unsigned long)g_count,
+                      g_stable_raw == HIGH ? "HIGH" : "LOW");
         return true;
       }
       g_stable_down = down;
@@ -65,3 +82,5 @@ void button_reset_count() {
 bool button_is_down() { return g_stable_down; }
 
 int button_raw_level() { return digitalRead(BTN_PIN); }
+
+int button_active_level() { return g_active_level; }
diff --git a/src/ui.cpp b/src/ui.cpp
index ddebe01..49dcc5d 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -42,9 +42,10 @@ void ui_refresh_count() {
   }
   if (lbl_raw) {
     const int lv = button_raw_level();
-    lv_label_set_text_fmt(lbl_raw, "GPIO%d: %s", BTN_PIN, lv ? "HIGH" : "LOW");
+    lv_label_set_text_fmt(lbl_raw, "OUT %s  act=%s", lv ? "HIGH" : "LOW",
+                          button_active_level() ? "HIGH" : "LOW");
     lv_obj_set_style_text_color(lbl_raw,
-                                lv_color_hex(lv ? COL_MUTED : 0x3DDC97), 0);
+                                lv_color_hex(lv ? 0x3DDC97 : COL_MUTED), 0);
   }
 }
 
@@ -68,7 +69,7 @@ void ui_create() {
   lv_obj_align(lbl_title, LV_ALIGN_TOP_MID, 0, 4);
 
   lbl_pin = lv_label_create(scr);
-  lv_label_set_text_fmt(lbl_pin, "IO%d <-> switch <-> GND", BTN_PIN);
+  lv_label_set_text_fmt(lbl_pin, "OUT->GPIO%d  VCC 3.3V", BTN_PIN);
   lv_obj_set_style_text_color(lbl_pin, lv_color_hex(COL_MUTED), 0);
   lv_obj_set_style_text_font(lbl_pin, &lv_font_montserrat_14, 0);
   lv_obj_align(lbl_pin, LV_ALIGN_TOP_MID, 0, 36);
@@ -92,7 +93,7 @@ void ui_create() {
   lv_obj_align(lbl_state, LV_ALIGN_TOP_MID, 0, 126);
 
   lbl_raw = lv_label_create(scr);
-  lv_label_set_text(lbl_raw, "GPIO22: HIGH");
+  lv_label_set_text(lbl_raw, "OUT --");
   lv_obj_set_style_text_color(lbl_raw, lv_color_hex(COL_MUTED), 0);
   lv_obj_set_style_text_font(lbl_raw, &lv_font_montserrat_14, 0);
   lv_obj_align(lbl_raw, LV_ALIGN_TOP_MID, 0, 152);