diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 52c06b7..904f7fe 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -1,2 +1,2 @@
-idf_component_register(SRCS "i2c.c" "asr_pro.c" "ci_03t.c" "ui_input.c" "ambient_light.c" "temperature.c" "embedded_display.c" "mqtt.c" "main.c" "wifi.c" "light.c" "mqtt.c"
+idf_component_register(SRCS "pca9555.c" "i2c.c" "asr_pro.c" "ci_03t.c" "ui_input.c" "ambient_light.c" "temperature.c" "embedded_display.c" "mqtt.c" "main.c" "wifi.c" "light.c" "mqtt.c"
                     INCLUDE_DIRS ".")
\ No newline at end of file
diff --git a/main/ambient_light.c b/main/ambient_light.c
index d358a1f..77e1915 100644
--- a/main/ambient_light.c
+++ b/main/ambient_light.c
@@ -6,15 +6,6 @@
 #include "esp_log.h"
 #include "i2c.c"
 
-#define ACK_CHECK_EN 0x1  /*!< I2C master will check ack from slave*/
-#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
-#define ACK_VAL 0x0       /*!< I2C ack value */
-#define NACK_VAL 0x1      /*!< I2C nack value */
-
-#define I2C_MASTER_NUM CONFIG_I2C_NUM
-
-#define APDS_9930_ADDRESS 0x39
-
 #define APDS_9930_CMD_REPEATED 0x80        // 命令重复地址
 #define APDS_9930_CMD_AUTO_INCREMENT 0x90  // 命令自动递增地址
 
@@ -45,8 +36,6 @@
 
 #define AMBIENT_LIGHT_TAG "ambient-light"
 
-static int8_t is_apds_9930_online = 0;
-
 esp_err_t apds_9930_write(uint8_t command, uint8_t data) {
   i2c_cmd_handle_t cmd = i2c_cmd_link_create();
   i2c_master_start(cmd);
@@ -193,10 +182,8 @@ void ambient_light_auto_fetch() {
 }
 
 void ambient_light_init() {
-  if (i2c_check_slave_exists(APDS_9930_ADDRESS)) {
-    is_apds_9930_online = 1;
-  } else {
-    is_apds_9930_online = 0;
+  if (is_apds_9930_online == 0) {
+    ESP_LOGI(AMBIENT_LIGHT_TAG, "AMG8833 is offline");
     return;
   }
   ESP_LOGI(AMBIENT_LIGHT_TAG, "Initializing APDS-9930");
diff --git a/main/embedded_display.c b/main/embedded_display.c
index 9a60bf8..0bc2ad7 100644
--- a/main/embedded_display.c
+++ b/main/embedded_display.c
@@ -13,15 +13,10 @@
 #define X_WIDTH 128
 #define Y_WIDTH 64
 
-#define I2C_ADDRESS 0x78
-#define I2C_MASTER_NUM CONFIG_I2C_NUM
-
-static uint8_t is_embedded_display_online = 0;
-
 void i2cWriteByte(uint8_t reg, uint8_t data) {
   i2c_cmd_handle_t cmd = i2c_cmd_link_create();
   i2c_master_start(cmd);
-  i2c_master_write_byte(cmd, I2C_ADDRESS | I2C_MASTER_WRITE, true);
+  i2c_master_write_byte(cmd, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
   i2c_master_write_byte(cmd, reg, true);
   i2c_master_write_byte(cmd, data, true);
   i2c_master_stop(cmd);
@@ -78,10 +73,8 @@ void display_print8_str(uint8_t x, uint8_t y, char str[]) {
 }
 
 void init_display() {
-  if (i2c_check_slave_exists(I2C_ADDRESS >> 1)) {
-    is_embedded_display_online = 1;
-  } else {
-    is_embedded_display_online = 0;
+  if (is_embedded_display_online == 0) {
+    ESP_LOGE("display", "display is offline");
     return;
   }
 
diff --git a/main/i2c.c b/main/i2c.c
index 32ed8ef..1d316d6 100644
--- a/main/i2c.c
+++ b/main/i2c.c
@@ -8,11 +8,27 @@
 #define I2C_MASTER_SDA_IO CONFIG_I2C_SDA
 #define I2C_MASTER_SCL_IO CONFIG_I2C_SCL
 
+#define ACK_CHECK_EN 0x1  /*!< I2C master will check ack from slave*/
+#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
+#define ACK_VAL 0x0       /*!< I2C ack value */
+#define NACK_VAL 0x1      /*!< I2C nack value */
+
 #define I2C_MASTER_FREQ_HZ 400000 /*!< I2C master clock frequency */
 #define I2C_MASTER_NUM CONFIG_I2C_NUM
 
+// 0 1 0 0 A2 A1 A0
+#define PCA9555_ADDRESS 0x20
+#define GX21M15_ADDRESS 0x48
+#define APDS_9930_ADDRESS 0x39
+#define I2C_ADDRESS 0x3c
+
 static const char *I2C_TAG = "APP_I2C";
 
+static uint8_t is_temperature_online = 0;
+static uint8_t is_pca9555_online = 0;
+static uint8_t is_apds_9930_online = 0;
+static uint8_t is_embedded_display_online = 0;
+
 void init_i2c() {
   i2c_config_t conf = {
       .mode = I2C_MODE_MASTER,
@@ -22,10 +38,10 @@ void init_i2c() {
       .scl_pullup_en = GPIO_PULLUP_ENABLE,
       .master.clk_speed = I2C_MASTER_FREQ_HZ,
   };
-  i2c_param_config(I2C_MASTER_NUM, &conf);
   ESP_ERROR_CHECK(i2c_driver_install(I2C_MASTER_NUM, conf.mode,
                                      I2C_MASTER_RX_BUF_DISABLE,
                                      I2C_MASTER_TX_BUF_DISABLE, 0));
+  i2c_param_config(I2C_MASTER_NUM, &conf);
 
   ESP_LOGI(I2C_TAG, "I2C initialized");
 }
@@ -34,16 +50,26 @@ uint8_t i2c_check_slave_exists(uint8_t address) {
   ESP_LOGI(I2C_TAG, "Checking if slave 0x%2x exists", address);
   i2c_cmd_handle_t cmd = i2c_cmd_link_create();
   i2c_master_start(cmd);
-  i2c_master_write_byte(cmd, (address << 1) | I2C_MASTER_WRITE, 1);
+  i2c_master_write_byte(cmd, (address << 1) | I2C_MASTER_WRITE, ACK_CHECK_EN);
   i2c_master_stop(cmd);
-  esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 100 / portTICK_RATE_MS);
+  esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 50 / portTICK_RATE_MS);
   i2c_cmd_link_delete(cmd);
 
   if (ret == ESP_OK) {
     ESP_LOGW(I2C_TAG, "Slave 0x%2x found", address);
     return 1;
+  } else if (ret == ESP_ERR_TIMEOUT) {
+    ESP_LOGW(I2C_TAG, "Slave 0x%2x TIMEOUT", address);
+    return 1;
   } else {
     ESP_LOGW(I2C_TAG, "Slave 0x%2x not found", address);
     return 0;
   }
+}
+
+void i2c_check_slaves() {
+  is_temperature_online = i2c_check_slave_exists(GX21M15_ADDRESS);
+  is_pca9555_online = i2c_check_slave_exists(PCA9555_ADDRESS);
+  is_apds_9930_online = i2c_check_slave_exists(APDS_9930_ADDRESS);
+  is_embedded_display_online = i2c_check_slave_exists(I2C_ADDRESS);
 }
\ No newline at end of file
diff --git a/main/main.c b/main/main.c
index 8eabe1b..3a06fb1 100644
--- a/main/main.c
+++ b/main/main.c
@@ -7,6 +7,7 @@
 #include "i2c.c"
 #include "light.c"
 #include "mqtt.c"
+#include "pca9555.c"
 #include "sdkconfig.h"
 #include "temperature.c"
 #include "ui_input.c"
@@ -17,12 +18,14 @@ static const char *TAG = "DisplayAmbientLight";
 void app_main(void) {
   light_init_strip();
   init_i2c();
+  i2c_check_slaves();
   init_display();
   display_print8_str(0, 0, "Ambient Light");
   ci_03t_init();
   ambient_light_init();
   ambient_light_auto_fetch();
   auto_fetch_temperature();
+  pca9555_init();
   ui_input_init();
   xTaskCreate(mqtt_publish_ui_input, "mqtt_publish_ui_input", 2048, NULL, 10,
               NULL);
diff --git a/main/pca9555.c b/main/pca9555.c
new file mode 100644
index 0000000..d08a3c2
--- /dev/null
+++ b/main/pca9555.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "driver/i2c.h"
+#include "embedded_display.c"
+#include "esp_log.h"
+#include "i2c.c"
+
+#define PCA_9555_TAG "PCA9555"
+
+
+// Register of command byte
+#define PCA95555_CMD_INPUT_PORT_0 0x00
+#define PCA95555_CMD_INPUT_PORT_1 0x01
+#define PCA95555_CMD_OUTPUT_PORT_0 0x02
+#define PCA95555_CMD_OUTPUT_PORT_1 0x03
+#define PCA95555_CMD_POLARITY_INVERSION_PORT_0 0x04
+#define PCA95555_CMD_POLARITY_INVERSION_PORT_1 0x05
+#define PCA95555_CMD_CONFIGURATION_PORT_0 0x06
+#define PCA95555_CMD_CONFIGURATION_PORT_1 0x07
+
+
+
+
+void pca9555_init() {
+  if (is_pca9555_online == 0) {
+    ESP_LOGE(PCA_9555_TAG, "salve offline");
+    return;
+  }
+  ESP_LOGI(PCA_9555_TAG, "Initializing PCA9555");
+  // esp_log_level_set(PCA_9555_TAG, ESP_LOG_ERROR);
+}
diff --git a/main/temperature.c b/main/temperature.c
index 3a3f486..aebb889 100644
--- a/main/temperature.c
+++ b/main/temperature.c
@@ -11,9 +11,6 @@
 #define ACK_VAL 0x0       /*!< I2C ack value */
 #define NACK_VAL 0x1      /*!< I2C nack value */
 
-#define I2C_MASTER_NUM CONFIG_I2C_NUM
-
-#define GX21M15_ADDRESS 0x90
 #define GX21M15_TEMP_POINTER_VALUE 0b00   // 温度寄存器
 #define GX21M15_CONF_POINTER_VALUE 0b01   // 配置寄存器
 #define GX21M15_THYST_POINTER_VALUE 0b10  // 回滞寄存器
@@ -22,8 +19,6 @@
 #define DEFAULT_TEMPERATURE -999  // 过温关断寄存器
 #define TEMPERATURE_TAG "temperature"
 
-static uint8_t is_temperature_online = 0;
-
 void fetch_temperature(void* arg) {
   esp_err_t error;
   float temperature = DEFAULT_TEMPERATURE;
@@ -33,11 +28,11 @@ void fetch_temperature(void* arg) {
   for (;;) {
     i2c_cmd_handle_t cmd = i2c_cmd_link_create();
     i2c_master_start(cmd);
-    i2c_master_write_byte(cmd, GX21M15_ADDRESS | I2C_MASTER_WRITE,
+    i2c_master_write_byte(cmd, GX21M15_ADDRESS << 1 | I2C_MASTER_WRITE,
                           ACK_CHECK_EN);
     i2c_master_write_byte(cmd, 0, ACK_CHECK_EN);
     i2c_master_start(cmd);
-    i2c_master_write_byte(cmd, GX21M15_ADDRESS | I2C_MASTER_READ, ACK_VAL);
+    i2c_master_write_byte(cmd, GX21M15_ADDRESS << 1 | I2C_MASTER_READ, ACK_VAL);
     i2c_master_read_byte(cmd, &(temperature_buffer[0]), ACK_VAL);
     i2c_master_read_byte(cmd, &(temperature_buffer[1]), NACK_VAL);
     i2c_master_stop(cmd);
@@ -73,12 +68,10 @@ void fetch_temperature(void* arg) {
 }
 
 void auto_fetch_temperature() {
-  // if (i2c_check_slave_exists(GX21M15_ADDRESS >> 1)) {
-  //   is_temperature_online = 1;
-  // } else {
-  //   is_temperature_online = 0;
-  //   return;
-  // }
+  if (is_temperature_online == 0) {
+    ESP_LOGW(TEMPERATURE_TAG, "temperature is offline");
+    return;
+  }
   ESP_LOGI(TEMPERATURE_TAG, "auto_fetch_temperature");
   xTaskCreate(fetch_temperature, "temperature", 2048, NULL, 10, NULL);
 }