diff --git a/ESP-IDF_Robot/tutorial/docs/build/doctrees/environment.pickle b/ESP-IDF_Robot/tutorial/docs/build/doctrees/environment.pickle
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/doctrees/overview.doctree b/ESP-IDF_Robot/tutorial/docs/build/doctrees/overview.doctree
index 5d86d0965..2c11cc79f 100644
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-0.bmp b/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-0.bmp
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-50.bmp b/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-50.bmp
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-95.bmp b/ESP-IDF_Robot/tutorial/docs/build/html/_images/ESP-IDF_Robot_PWM_Duty-95.bmp
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index 000000000..75313cb33
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/html/_sources/overview.rst.txt b/ESP-IDF_Robot/tutorial/docs/build/html/_sources/overview.rst.txt
index dedb925a4..33f8fde4f 100644
--- a/ESP-IDF_Robot/tutorial/docs/build/html/_sources/overview.rst.txt
+++ b/ESP-IDF_Robot/tutorial/docs/build/html/_sources/overview.rst.txt
@@ -30,6 +30,12 @@ Changing PWM on each channel determines the speed and direction of the RC car.
 
 The following images illustrate various PWM duty cycles recorded by oscilloscope.
 
+.. image:: _static/ESP-IDF_Robot_PWM_Duty-0.bmp
+
+.. image:: _static/ESP-IDF_Robot_PWM_Duty-50.bmp
+
+.. image:: _static/ESP-IDF_Robot_PWM_Duty-95.bmp
+
 .. raw:: html
 
    <br/><br/><br/><br/>
diff --git a/ESP-IDF_Robot/tutorial/docs/build/html/overview.html b/ESP-IDF_Robot/tutorial/docs/build/html/overview.html
index f2eb80027..594a4280d 100644
--- a/ESP-IDF_Robot/tutorial/docs/build/html/overview.html
+++ b/ESP-IDF_Robot/tutorial/docs/build/html/overview.html
@@ -54,6 +54,9 @@ In particular, <strong>GPIO6</strong> and <strong>GPIO5</strong> provide PWM to
 Similarly, <strong>GPIO4</strong> and <strong>GPIO7</strong> provide PWM to the left- and right- side DC motors to rotate in a <strong>counter-clockwise</strong> direction.
 Changing PWM on each channel determines the speed and direction of the RC car.</p>
 <p>The following images illustrate various PWM duty cycles recorded by oscilloscope.</p>
+<img alt="_images/ESP-IDF_Robot_PWM_Duty-0.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-0.bmp" />
+<img alt="_images/ESP-IDF_Robot_PWM_Duty-50.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-50.bmp" />
+<img alt="_images/ESP-IDF_Robot_PWM_Duty-95.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-95.bmp" />
 <br/><br/><br/><br/><table class="docutils align-default">
 <thead>
 <tr class="row-odd"><th class="head"><p>GPIO</p></th>
diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/.buildinfo b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/.buildinfo
index f5f3193b9..9c112fb9f 100644
--- a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/.buildinfo
+++ b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file records the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 2874c398b388835642849af988d47b70
+config: de510ee92b1b7d1575cb22a258e533cf
 tags: 62a1e7829a13fc7881b6498c52484ec0
diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_images/ESP-IDF_Robot_PWM_Duty-0.bmp b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_images/ESP-IDF_Robot_PWM_Duty-0.bmp
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new file mode 100644
index 000000000..402d338d8
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_images/ESP-IDF_Robot_PWM_Duty-95.bmp b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_images/ESP-IDF_Robot_PWM_Duty-95.bmp
new file mode 100644
index 000000000..75313cb33
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diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/index.html b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/index.html
index e812edf8b..a61878e52 100644
--- a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/index.html
+++ b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/index.html
@@ -246,6 +246,9 @@ Changing PWM on each channel determines the speed and direction of the RC car.
            <p>
             The following images illustrate various PWM duty cycles recorded by oscilloscope.
            </p>
+           <img alt="_images/ESP-IDF_Robot_PWM_Duty-0.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-0.bmp"/>
+           <img alt="_images/ESP-IDF_Robot_PWM_Duty-50.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-50.bmp"/>
+           <img alt="_images/ESP-IDF_Robot_PWM_Duty-95.bmp" src="_images/ESP-IDF_Robot_PWM_Duty-95.bmp"/>
            <br/>
            <br/>
            <br/>