* update imu doc

Author: lxowalle

docs/doc/en/modules/ahrs.md

@@ -49,15 +49,16 @@ Some devices have a built-in IMU, as shown below:
 | Device Name | Sensor Model | Accelerometer | Gyroscope | Magnetometer | Interface            | Features                                        |
 | ----------- | ------------ | ------------- | --------- | ------------ | -------------------- | ----------------------------------------------- |
 | MaixCAM-Pro | QMI8658      | ✅             | ✅         | ❌            | IIC4<br>Address 0x6B | Low power<br>High stability<br>High sensitivity |
-| MaixCAM     | None ❌       | ❌             | ❌         | ❌            |                      |                                                 |
+| MaixCAM     | None ❌      | ❌             | ❌         | ❌            |                      |                                                 |
+| MaixCAM2    | LSM6DSOWTR   | ✅             | ✅         | ❌            | Built-in driver      | Low power<br>High stability<br>High sensitivity |
 
 Besides using the built-in IMU, you can also connect an external IMU sensor, such as the classic `MPU6050/MPU9150`. Search for the latest and suitable sensors yourself.
 
 In MaixPy, attitude estimation and IMU drivers are separated, so you can use your own driver for external sensors and still call the attitude estimation algorithm.
 
 ## MaixPy Read IMU Data
 
-Using the built-in `QMI8658` of MaixCAM-Pro as an example, use `maix.imu.IMU` to read:
+Using MaixCAM-Pro as an example, use `maix.imu.IMU` to read:
 
 ```python
 from maix.ext_dev import imu
@@ -66,7 +67,7 @@ from maix.ext_dev import imu
 calibrate_first = False
 
 # default config: acc +-2g 1KHz, gyro +-256rad/s 8KHz
-sensor = imu.IMU("qmi8658", mode=imu.Mode.DUAL,
+sensor = imu.IMU("default", mode=imu.Mode.DUAL,
                               acc_scale=imu.AccScale.ACC_SCALE_2G,
                               acc_odr=imu.AccOdr.ACC_ODR_1000,
                               gyro_scale=imu.GyroScale.GYRO_SCALE_256DPS,
@@ -93,7 +94,7 @@ while True:
 ```
 
 Here, an `IMU` object is constructed, then `read_all` is called to read and print the data.
-Since `qmi8658` has no magnetometer, it's not printed.
+Since the onboard IMU has no magnetometer, it's not printed.
 
 However, note that calibration is needed, as explained below.
 

docs/doc/zh/modules/ahrs.md

@@ -50,7 +50,7 @@ IMU（Inertial Measurement Unit），即 惯性测量单元，通常由几部分
 | ----- | ----- | ------- | ----- | ---- | ---- | ---  |
 | MaixCAM-Pro | QMI8658 | ✅ | ✅ | ❌ | IIC4<br>地址 0x6B | 低功耗<br>高稳定性<br>高灵敏度 |
 | MaixCAM | 无板载 ❌ | ❌ | ❌ | ❌ | |  |  |
-
+| MaixCAM2 | LSM6DSOWTR | ✅ | ✅ | ❌ | 内置驱动 | 低功耗<br>高稳定性<br>高灵敏度 |
 
 除了使用内置的，你也可以自己外接一个 IMU 传感器，比如经典的`MPU6050/MPU9150`等，可自行查找最新和合适的传感器。
 
@@ -60,7 +60,7 @@ MaixPy 中姿态解算和 IMU 驱动是分开的，所以你可以自己外接
 
 ## MaixPy 读取 IMU 数据
 
-以 MaixCAM-Pro 自带的`QMI8658` 为例，使用 `maix.imu.IMU` 读取：
+以 MaixCAM-Pro 为例，使用 `maix.imu.IMU` 读取：
 
 ```python
 from maix.ext_dev import imu
@@ -69,7 +69,7 @@ from maix.ext_dev import imu
 calibrate_first = False
 
 # default config: acc +-2g 1KHz, gyro +-256rad/s 8KHz
-sensor = imu.IMU("qmi8658", mode=imu.Mode.DUAL,
+sensor = imu.IMU("default", mode=imu.Mode.DUAL,
                               acc_scale=imu.AccScale.ACC_SCALE_2G,
                               acc_odr=imu.AccOdr.ACC_ODR_1000,
                               gyro_scale=imu.GyroScale.GYRO_SCALE_256DPS,
@@ -97,7 +97,7 @@ while True:
 ```
 
 这里构造了一个`IMU`对象，然后调用`read_all`读取数据，再打印。
-由于`qmi8658` 没有 磁力计，这里没有打印。
+由于板载IMU没有 磁力计，这里没有打印。
 
 
 

examples/ext_dev/sensors/imu/imu_read_data.py

@@ -4,7 +4,7 @@
 calibrate_first = False
 
 # default config: acc +-2g 1KHz, gyro +-256rad/s 8KHz
-sensor = imu.IMU("qmi8658", mode=imu.Mode.DUAL,
+sensor = imu.IMU("default", mode=imu.Mode.DUAL,
                               acc_scale=imu.AccScale.ACC_SCALE_2G,
                               acc_odr=imu.AccOdr.ACC_ODR_1000,
                               gyro_scale=imu.GyroScale.GYRO_SCALE_256DPS,