diff --git a/ReadMe.md b/ReadMe.md
index 90138ea..b2e2321 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -38,8 +38,14 @@ uart_temp是用于8051单片机上的一个项目，用于获取温度，并使
 
 4. 打开串口软件，接收来自单片机的数据
 
+    串口波特率：9600
+
+    ```bash
+    minicom -D /dev/ttyUSB0 -b 9600
+    ```
+
 5. 运行`process.py`解析数据生成图片
-    
+
     ```bash
         # 新建虚拟环境
         virtualenv env
diff --git a/SimHei.ttf b/SimHei.ttf
new file mode 100644
index 0000000..c5030ae
Binary files /dev/null and b/SimHei.ttf differ
diff --git a/process.py b/process.py
index 2601502..f21b9e8 100644
--- a/process.py
+++ b/process.py
@@ -21,7 +21,11 @@ for line in lines:
                         timedelta(minutes=int(time_str.split(':')[1])) + \
                         timedelta(hours=int(time_str.split(':')[0]))
     temperature = float(temp_str)
-    if temperature >= 10 and temperature <= 40:
+    if len(temperatures) > 0:
+        pre_temp = temperatures[-1]
+    else:
+        pre_temp = temperature
+    if pre_temp-0.5 < temperature < pre_temp+0.5:
         times.append(time)
         temperatures.append(temperature)
 
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..daf7203
--- /dev/null
+++ b/test.py
@@ -0,0 +1,3 @@
+import matplotlib
+print(matplotlib.matplotlib_fname())
+print(matplotlib.get_cachedir())