diff --git a/main.py b/main.py
index 447c4c7..292f51e 100644
--- a/main.py
+++ b/main.py
@@ -136,6 +136,7 @@ def cmd_str():
     sync_system_time_from_4g()
 
     # 2.1 WiFi 热点配网兜底：仅当 STA 与 4G 均不可用时起 AP + HTTP；提交后删 /boot/wifi.ap、建 wifi.sta 并 reboot
+    _ota_pending_path = f"{config.APP_DIR}/ota_pending.json"
     try:
         from wifi_config_httpd import maybe_start_wifi_ap_fallback
 
@@ -286,12 +287,13 @@ def cmd_str():
         logger.info("系统准备完成...")
 
     last_adc_trigger = 0
+    trigger_adc_val = 0  # 触发时的气压值，气压需降回此值以下才能再次触发
     # 读取一次ADC初始值，防止开机时传感器已有压力导致误触发
+    enable_check = True
     try:
         last_adc_val = hardware_manager.adc_obj.read()
     except Exception:
         last_adc_val = 0
-    peak_adc_val = 0  # 当前周期内的压力峰值
     # 气压采样：减少日志频率（每 N 个点输出一条），避免 logger.debug 拖慢采样
     PRESSURE_BATCH_SIZE = 100
 
@@ -381,22 +383,16 @@ def cmd_str():
                 pressure_max = adc_val
             if len(pressure_buf) >= PRESSURE_BATCH_SIZE:
                 _flush_pressure_buf("batch")
-            # 峰值检测：压力从峰值下降时触发，确保捕获到最大冲击时刻
-            if adc_val > peak_adc_val:
-                peak_adc_val = adc_val  # 更新峰值
-            if (peak_adc_val >= config.ADC_TRIGGER_THRESHOLD
-                    and adc_val < peak_adc_val
-                    and last_adc_val >= peak_adc_val):
-                # 封顶后下降沿触发：peak是最大值，当前值开始下降，且上次值还在peak位置
+            # 突变增量检测：压力增量大于300时触发
+            # 触发后需等气压降到触发值以下才重新检测增量
+            if adc_val < trigger_adc_val :
+                enable_check = True
+            if (adc_val - last_adc_val) > 500 and enable_check:
                 hardware_manager.start_idle_timer()  # 重新计时
-                diff_ms = current_time - last_adc_trigger
-                if diff_ms < 3000:
-                    peak_adc_val = 0  # 去抖期间重置峰值
-                    time.sleep_ms(5)
-                    continue
                 last_adc_trigger = current_time
-                peak_adc_val = 0  # 触发后重置峰值
-                # 触发前先把缓存刷出来，避免波形被长耗时处理截断
+                trigger_adc_val = adc_val  # 记录触发时的气压值
+                last_adc_val = adc_val  # 更新基准值，防止连续增量误触发
+                enable_check = False
                 _flush_pressure_buf("before_trigger")
 
                 try:
@@ -415,7 +411,7 @@ def cmd_str():
                         camera_manager.show(camera_manager.read_frame())
                     except Exception as e:
                         pass
-                time.sleep_ms(5)
+                time.sleep_ms(1)
             last_adc_val = adc_val
 
         except Exception as e: