diff --git a/02.nicsensor/code_structure.txt b/02.nicsensor/code_structure.txt
new file mode 100644
index 0000000..2e4cc2a
--- /dev/null
+++ b/02.nicsensor/code_structure.txt
@@ -0,0 +1,10 @@
+On Version V1.2
+    start_get_sensor
+        |--->set_configuration
+        |       |--->set_configuration_5280m7/5468m7/donghu/yichun
+        |--->get_pca9641_controll
+        |--->switch_pca9548_channel
+        |--->process_sensor
+                |--->sensor_init
+                |--->read_sensor_value
+                |--->convert_sensor_value
\ No newline at end of file