添加对额外 UI 资源和火焰状态变量的支持

- 增加了 `ui.h` 中资源数组的大小以容纳新的 UI 元素。
- 更新了 `ui_font_chinese_16.c`，添加了更多中文字符以更好地支持本地化。
- 在 `vars.h` 中添加了用于管理火焰状态的新函数，增强了系统的监测能力。

components/fire_sensor/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "fire_sensor.c"
+                    INCLUDE_DIRS "include"
+                    REQUIRES esp_adc MQ-2)

components/fire_sensor/fire_sensor.c

@@ -0,0 +1,77 @@
+#include "fire_sensor.h"
+
+#include "MQ-2.h"
+
+#include "esp_adc/adc_oneshot.h"
+#include "esp_check.h"
+
+#define FIRE_ADC_UNIT ADC_UNIT_1
+#define FIRE_ADC_CHANNEL ADC_CHANNEL_2
+#define FIRE_SAMPLE_COUNT 8
+
+static const char *TAG = "fire_sensor";
+static adc_oneshot_unit_handle_t s_adc_handle = NULL;
+static bool s_inited = false;
+
+esp_err_t fire_sensor_init(void)
+{
+    if (s_inited) {
+        return ESP_OK;
+    }
+
+    // Reuse ADC1 oneshot unit created by MQ-2 to avoid "adc1 is already in use".
+    ESP_RETURN_ON_ERROR(mq2_init(), TAG, "mq2 init failed");
+    s_adc_handle = mq2_get_adc_handle();
+    ESP_RETURN_ON_FALSE(s_adc_handle != NULL, ESP_ERR_INVALID_STATE, TAG, "shared adc handle is null");
+
+    adc_oneshot_chan_cfg_t chan_cfg = {
+        .atten = ADC_ATTEN_DB_12,
+        .bitwidth = ADC_BITWIDTH_DEFAULT,
+    };
+    ESP_RETURN_ON_ERROR(adc_oneshot_config_channel(s_adc_handle, FIRE_ADC_CHANNEL, &chan_cfg),
+                        TAG, "adc channel config failed");
+
+    s_inited = true;
+    return ESP_OK;
+}
+
+esp_err_t fire_sensor_read_raw(int *raw_out)
+{
+    ESP_RETURN_ON_FALSE(raw_out != NULL, ESP_ERR_INVALID_ARG, TAG, "raw_out is null");
+    ESP_RETURN_ON_FALSE(s_inited, ESP_ERR_INVALID_STATE, TAG, "fire sensor not initialized");
+
+    int sum = 0;
+    for (int i = 0; i < FIRE_SAMPLE_COUNT; ++i) {
+        int sample = 0;
+        ESP_RETURN_ON_ERROR(adc_oneshot_read(s_adc_handle, FIRE_ADC_CHANNEL, &sample),
+                            TAG, "adc read failed");
+        sum += sample;
+    }
+
+    *raw_out = sum / FIRE_SAMPLE_COUNT;
+    return ESP_OK;
+}
+
+esp_err_t fire_sensor_read_percent(float *percent_out)
+{
+    ESP_RETURN_ON_FALSE(percent_out != NULL, ESP_ERR_INVALID_ARG, TAG, "percent_out is null");
+
+    int raw = 0;
+    ESP_RETURN_ON_ERROR(fire_sensor_read_raw(&raw), TAG, "read raw failed");
+
+    // Most flame modules output lower voltage when flame is stronger.
+    // Map raw inversely to "danger percent":
+    // raw=4095 -> 0%, raw=0 -> 100%
+    *percent_out = ((4095.0f - (float)raw) * 100.0f) / 4095.0f;
+    if (*percent_out < 0.0f) {
+        *percent_out = 0.0f;
+    } else if (*percent_out > 100.0f) {
+        *percent_out = 100.0f;
+    }
+    return ESP_OK;
+}
+
+bool fire_sensor_is_danger(float percent, float threshold_percent)
+{
+    return percent >= threshold_percent;
+}

components/fire_sensor/include/fire_sensor.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ESP32-S3: GPIO3 -> ADC1_CHANNEL_2
+#define FIRE_SENSOR_ADC_GPIO 3
+
+esp_err_t fire_sensor_init(void);
+esp_err_t fire_sensor_read_raw(int *raw_out);
+esp_err_t fire_sensor_read_percent(float *percent_out);
+bool fire_sensor_is_danger(float percent, float threshold_percent);
+
+#ifdef __cplusplus
+}
+#endif