diff --git a/README.md b/README.md
index 57c2b9d..aebe2b6 100644
--- a/README.md
+++ b/README.md
@@ -14,19 +14,23 @@ GPIO22 读人体红外（PIR）模块 OUT：每次检测到运动开始，屏幕
 
 | 模块 | CYD |
 |------|-----|
-| VCC | **3.3V**（部分模块标 5V 时用 **5V**，以模块说明为准） |
+| VCC | 优先 **5V**（HC-SR501 等大模块）；仅明确标 3.3V 的小模块用 **3.3V** |
 | GND | **GND** |
 | OUT / S / DO | **GPIO22** |
 
-开机自动采空闲电平，反相视为有人（兼容「有人变高」或「有人变低」）。
+引脚用浮空 `INPUT`（无内部上/下拉）。默认空闲 LOW、有人 HIGH；开机若采样明显偏 HIGH 则自动反相。
 
 屏上：
 
 - `MOTION` / `IDLE`：当前是否感应到人
 - `hold` + 进度条：本次连续有人时长（约 0～5s 满格）
-- `OUT HIGH/LOW` 与 `act=`：原始电平与有效电平
+- `OUT HIGH/LOW` 与 `act=`：原始电平与有效电平 —— **挥手时 OUT 应变，不变就是供电/接线问题**
 
-上电校准的几秒内请勿在感应区活动，否则空闲电平会采错。
+注意：
+
+- 多数 PIR 上电后需 **约 30～60 秒** 预热才稳定
+- 确认 OUT 接到 **GPIO22**（不是 21 背光），共地
+- 模块有灵敏度/延时电位器时，灵敏度先拧到最大
 
 ## 操作
 
diff --git a/firmware/cyd/VERSION.txt b/firmware/cyd/VERSION.txt
index 76f6bb4..2076979 100644
--- a/firmware/cyd/VERSION.txt
+++ b/firmware/cyd/VERSION.txt
@@ -1,5 +1,5 @@
 name: CYD Human IR / PIR (cyd)
-git: bab93d0
+git: a7854de
 date: 2026-10-23
 board: ESP32-2432S028R (ILI9341)
 features: SoftSPI touch, LVGL, PIR OUT on GPIO22 motion count+1
@@ -12,5 +12,5 @@ offsets:
 sha256:
   bootloader.bin  3D234A7471F67B013686DABD4DEE7C1FA915C9928463616A94BC9297ACF1ABF8
   boot_app0.bin   F94C5D786A7A8FAB06AC5D10E33BF37711A6697636DC037559EA19CC410A17F0
-  firmware.bin    67228A24CE3DBED1C9CBA1AD811DB016AE7F9D12470E0DAD8E329004DC593F7B
+  firmware.bin    CA8FBB88050BC2284EFDDBF3ECC711A6539D4F3829994017812A30C0E2E6B057
   partitions.bin  148B959CBFF1C38AA8E1D5C0BA9D612C54997B945E56A63F41223EEF650653A1
diff --git a/firmware/cyd/firmware.bin b/firmware/cyd/firmware.bin
index 3862442..7a625e1 100644
Binary files a/firmware/cyd/firmware.bin and b/firmware/cyd/firmware.bin differ
diff --git a/src/pir.cpp b/src/pir.cpp
index 22d7eef..2f8c4ec 100644
--- a/src/pir.cpp
+++ b/src/pir.cpp
@@ -4,8 +4,8 @@
 #include <Arduino.h>
 
 // 人体红外（PIR）模块：VCC / GND / OUT→GPIO22
-// 开机采空闲电平，反相视为有人；上升沿计 1 次
-// 积分滤波：压启动抖沿；松手侧迟滞防闪烁
+// 浮空 INPUT（不上/下拉），避免与模块开漏/弱推挽打架
+// 默认按「空闲 LOW、有人 HIGH」；开机采样仅在明显偏 HIGH 时反相
 
 static uint32_t g_count = 0;
 static bool g_stable_active = false;
@@ -14,12 +14,14 @@ static int g_idle_level = LOW;
 static int8_t g_score = 0;
 static uint32_t g_lock_until_ms = 0;
 static uint32_t g_active_since_ms = 0;
+static int g_last_logged_raw = -1;
+static uint32_t g_last_hb_ms = 0;
 
-static constexpr int8_t SCORE_MAX = 6;
-static constexpr int8_t ON_TH = 3;
-static constexpr int8_t OFF_TH = -3;
-// PIR 输出常保持数秒；边沿后再忽略短暂抖动，避免同一次感应连计
-static constexpr uint32_t LOCKOUT_MS = 250;
+static constexpr int8_t SCORE_MAX = 4;
+static constexpr int8_t ON_TH = 2;
+static constexpr int8_t OFF_TH = -2;
+static constexpr uint32_t LOCKOUT_MS = 200;
+static constexpr uint32_t HEARTBEAT_MS = 2000;
 
 static bool raw_is_active(int raw) { return raw == g_active_level; }
 
@@ -29,30 +31,31 @@ static int read_majority() {
     if (digitalRead(PIR_PIN) == HIGH) {
       high_n++;
     }
-    delayMicroseconds(50);
+    delayMicroseconds(40);
   }
   return (high_n >= 3) ? HIGH : LOW;
 }
 
 void pir_init() {
+  // 与触控模块一样：浮空 INPUT，不要内部上/下拉
   pinMode(PIR_PIN, INPUT);
-  delay(30);
+  delay(50);
 
   int high_n = 0;
-  for (int i = 0; i < 40; i++) {
+  for (int i = 0; i < 50; i++) {
     if (digitalRead(PIR_PIN) == HIGH) {
       high_n++;
     }
     delay(2);
   }
-  g_idle_level = (high_n >= 20) ? HIGH : LOW;
-  g_active_level = (g_idle_level == HIGH) ? LOW : HIGH;
 
-  // 推挽 OUT 也可；弱拉向空闲侧减轻悬空噪声
-  if (g_idle_level == HIGH) {
-    pinMode(PIR_PIN, INPUT_PULLUP);
+  // 多数 PIR：空闲 LOW。仅当开机采样明显偏 HIGH（如反相模块）才反相
+  if (high_n >= 40) {
+    g_idle_level = HIGH;
+    g_active_level = LOW;
   } else {
-    pinMode(PIR_PIN, INPUT_PULLDOWN);
+    g_idle_level = LOW;
+    g_active_level = HIGH;
   }
 
   g_stable_active = false;
@@ -60,15 +63,32 @@ void pir_init() {
   g_lock_until_ms = 0;
   g_active_since_ms = 0;
   g_count = 0;
+  g_last_logged_raw = -1;
+  g_last_hb_ms = 0;
 
-  Serial.printf("PIR GPIO%d idle=%s active=%s pull=%s\n", PIR_PIN,
-                g_idle_level == HIGH ? "HIGH" : "LOW",
-                g_active_level == HIGH ? "HIGH" : "LOW",
-                g_idle_level == HIGH ? "UP" : "DOWN");
+  Serial.printf(
+      "PIR GPIO%d float INPUT idle=%s active=%s (high_n=%d/50)\n", PIR_PIN,
+      g_idle_level == HIGH ? "HIGH" : "LOW",
+      g_active_level == HIGH ? "HIGH" : "LOW", high_n);
+  Serial.println(
+      "PIR tip: many modules need 5V VCC; warm-up ~30s; watch OUT on screen");
 }
 
 bool pir_poll_detect() {
   const int raw = read_majority();
+  const uint32_t now = millis();
+
+  if (raw != g_last_logged_raw) {
+    g_last_logged_raw = raw;
+    Serial.printf("PIR raw -> %s @%lums\n", raw ? "HIGH" : "LOW",
+                  (unsigned long)now);
+  }
+  if (now - g_last_hb_ms >= HEARTBEAT_MS) {
+    g_last_hb_ms = now;
+    Serial.printf("PIR hb raw=%s active=%d count=%lu\n", raw ? "HIGH" : "LOW",
+                  (int)g_stable_active, (unsigned long)g_count);
+  }
+
   if (raw_is_active(raw)) {
     if (g_score < SCORE_MAX) {
       g_score++;
@@ -77,8 +97,6 @@ bool pir_poll_detect() {
     g_score--;
   }
 
-  const uint32_t now = millis();
-
   if (!g_stable_active && g_score >= ON_TH) {
     g_stable_active = true;
     g_active_since_ms = now;