add motor calibration

sunfounder · Sep 21, 2022 · 4745795 · 4745795
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diff --git a/docs/source/get_started/example_motor_calibrate.rst b/docs/source/get_started/example_motor_calibrate.rst
@@ -0,0 +1,23 @@
+Motor Calibration
+=================
+
+Because of assembly methods and other reasons, your motor may still need a calibration direction. Otherwise, when the car moves forward, it may turn left, turn right, or even go backwards. Please follow the following steps to complete the calibration.
+
+**How to do？**
+
+#. Select Correct Interpreter. Plug the Pico into your computer with a micro USB cable and select the "MicroPython (Raspberry Pi Pico).COMXX" interpreter in the bottom right corner.
+
+    .. image:: img/sec_inter.png
+
+
+#. Go to the ``pico_4wd_car/examples`` path and double click on ``move_forward.py`` to open it. 这是一个非常简单的示例，它会让小车往前走。
+
+    .. image:: img/move_forward.png
+
+#. Observe whether the wheels of the car are driving forward and marked the wrong motor.
+
+#. Open the ``pico_4wd.py`` file that was uploaded to the pico before, modify the wrong motor's ``dir`` to reverse the value and save it.
+
+    .. image:: img/rdp_dir.png
+
+#. Run again ``move_Forward.py``, if the car is driving correctly, the calibration is completed.
diff --git a/docs/source/get_started/examples.rst b/docs/source/get_started/examples.rst
@@ -7,7 +7,8 @@ The flowcharts in each examples and the |link_api_car| documentation can help yo
 
 .. toctree::
     :maxdepth: 1
-
+
+    example_motor_calibrate
     example_donot_push_me
     example_line_track
     example_follow_hand

diff --git a/docs/source/img/move_forward.png b/docs/source/img/move_forward.png
diff --git a/docs/source/img/rdp_dir.png b/docs/source/img/rdp_dir.png