diff --git a/README.md b/README.md
new file mode 100644
index 0000000..71b49a7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,28 @@
+# ESP32 TB6612 麦轮车
+
+## 特性
+
+- ESP32 主控
+- 四路 TB6612 电机驱动
+- 麦轮车
+- BLE 串口通信
+- 循迹功能
+- 手动控制
+
+## 原理图
+
+![原理图](./docs/原理图.png)
+
+## 使用
+
+### VSCode 安装 PlatformIO
+
+### 下载项目
+
+```bash
+git clone https://github.com/colour93/esp32-car.git
+```
+
+## BLE 串口通信协议
+
+[数据包格式](./packet.md)
\ No newline at end of file
diff --git a/docs/原理图.png b/docs/原理图.png
new file mode 100644
index 0000000..86bfecd
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diff --git a/packet.md b/packet.md
index 548160b..aab21e3 100644
--- a/packet.md
+++ b/packet.md
@@ -61,4 +61,14 @@
 
 包体 `00 06 21 方向 时间 FF`
 
-控制示例 `00 06 21 01 01 FF`
\ No newline at end of file
+控制示例 `00 06 21 01 01 FF`
+
+## 设置
+
+### 设置转向灵敏度 `0x30`
+
+含义为 1 度对应差速
+
+包体 `00 05 30 差速 FF`
+
+设置示例 `00 05 30 10 FF`
diff --git a/src/main.cpp b/src/main.cpp
index 9b176df..7cf1293 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,6 +6,8 @@
 
 #define STATUS_LED 2
 
+#define DEVICE_NAME "WhiteTiger"
+
 #define HC_SR04_TRIG 23
 #define HC_SR04_ECHO 22
 
@@ -165,7 +167,7 @@ void setup()
   Serial.begin(115200);
 
   // 初始化 BLE
-  BLEDevice::init("WhiteTiger");
+  BLEDevice::init(DEVICE_NAME);
   pServer = BLEDevice::createServer();
   pServer->setCallbacks(new CarBLEServerCallbacks());