Merge branch 'master' of github.com:sunfounder/sensor-kit-v2-for-arduino

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diff --git a/docs/source/get_started.rst b/docs/source/get_started.rst
@@ -2,11 +2,7 @@ Get Started
 =============
 
 .. note::
-    1) Before starting your own project, you must download the file `Sensor
-       Kit V2.0 for
-       Arduino.zip <http://www.sunfounder.com/learn/download/U21hcnRfQ2FyX2Zvcl9BcmR1aW5vLnppcA==/dispa>`__
-       on our official website by visiting **LEARN** -> **Get Tutorials** ->
-       **Sensor Kit V2.0 for Arduino** and unzip it.
+    1) Before starting your own project, you must download the file `Sensor Kit V2.0 for Arduino.zip <https://drive.google.com/file/d/1Fy88ikH1sagteuxBZaaE4dZ7XdAdr1pf/view?usp=sharing>`_ on our official website by visiting LEARN -> Sensor Kit V2.0 for Arduino and unzip it.
 
     2) Besides, a visual programming language software-Mixly is also
        provided. It can help you to complete the lessons quicker and easier.

diff --git a/docs/source/index.rst b/docs/source/index.rst
@@ -1,24 +1,11 @@
 Preface
 ==========
 
-About SunFounder
-------------------
+**About the Sensor Kit for Arduino 2.0**
 
-SunFounder is a technology company focused on Raspberry Pi and Arduino open source community development. Committed to the promotion of open source culture, we strive to bring the fun of electronics making to people all around the world and enable everyone to be a maker. Our products include learning kits, development boards, robots, sensor modules and development tools. In addition to high quality products, SunFounder also offers video tutorials to help you build your own project. If you have interest in open source or making something cool, welcome to join us! Visit www.sunfounder.com for more!
+The kit is suitable for SunFounder Uno, Mega 2560, Duemilanove and Nano and also fully compatible with the corresponding Arduino boards. It includes 37 various modules for you to learn and we provide corresponding lessons which are simple and useful for better understanding. Hope you can learn their applications quickly and use them in your own projects! 
 
-About This Kit
-----------------
-
-The Rollarm Kit for Arduino is designed for mass hobbyists to learn robot arm control. With the open source MCU Arduino UNO and a servo expansion board, you can control its four axes by the 4 potentiometer on the handle, as well as make them move by operating on your computer. In addition, it can memorize the movements it’s made and repeat again and again, making it a great tool for repeated tasks.In this book, you can learn the basics of how a mechanical arm works and how to make one piece by piece. For more information, please go to our website www.sunfounder.com and find the tutorial under Learn. 
-
-Free Support
---------------
-
-If you have any TECHNICAL questions, add a topic under Community -> Forum section on our website and we’ll reply as soon as possible.
-
-For NON-TECH questions like order and shipment issues, please send an email to service@sunfounder.com. You’re also welcomed to share your projects on Forum.
-
-**Content**
+Here is the Email: cs@sunfounder.com.
 
 .. toctree::
    :maxdepth: 2

diff --git a/docs/source/lesson_1.rst b/docs/source/lesson_1.rst
@@ -54,6 +54,7 @@ In this experiment, we will let I2C LCD1602 display \"SunFounder\" and
     The I2C LCD1602 is connected to Mega2560 differently compared with being done to Uno. PLEASE follow the wiring above.
 
 .. image:: media/image61.png
+    :width: 800
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_10.rst b/docs/source/lesson_10.rst
@@ -47,8 +47,7 @@ more consistent and reliable.
 **Step 1:** Build the circuit
 
 .. image:: media/image96.png
-   :width: 5.21111in
-   :height: 3.65in
+   :width: 600
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_11.rst b/docs/source/lesson_11.rst
@@ -59,8 +59,7 @@ The schematic diagram
 **Step 1:** Build the circuit
 
 .. image:: media/image100.png
-   :width: 6.34028in
-   :height: 3.34792in
+   :width: 800
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_13.rst b/docs/source/lesson_13.rst
@@ -35,8 +35,7 @@ button-pressing signals, the LED will be on. Otherwise it will be off.
 **Step 1:** Build the circuit
 
 .. image:: media/image106.png
-   :width: 3.09722in
-   :height: 4.85in
+   :width: 400
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_14.rst b/docs/source/lesson_14.rst
@@ -44,8 +44,7 @@ pin SIG will output low level, and the LED on the module and that
 attached to pin 13 will light up.
 
 .. image:: media/image109.png
-   :width: 5.28889in
-   :height: 3.8125in
+   :width: 500
 
 **Step 2:** Open the code file (Lesson 14 Vibration Switch)
 

diff --git a/docs/source/lesson_15.rst b/docs/source/lesson_15.rst
@@ -35,8 +35,7 @@ an antenna that can receive electromagnetic waves in the air.
 **Step 1:** Build the circuit
 
 .. image:: media/image112.png
-   :width: 2.92431in
-   :height: 3.9375in
+   :width: 400
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_17.rst b/docs/source/lesson_17.rst
@@ -68,8 +68,7 @@ The wiring between the photoresistor and SunFounder Uno board:
 +-----------------------------------+-----------------------------------+
 
 .. image:: media/image119.png
-   :width: 5.77361in
-   :height: 3.94583in
+   :width: 800
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_18.rst b/docs/source/lesson_18.rst
@@ -61,8 +61,7 @@ The schematic diagram
 **Step 1:** Build the circuit
 
 .. image:: media/image122.png
-   :width: 3.02361in
-   :height: 3.98611in
+   :width: 450
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_19.rst b/docs/source/lesson_19.rst
@@ -83,8 +83,7 @@ de-energized and the relay will restore to the initial state.
 **Step 1:** Build the circuit
 
 .. image:: media/image126.png
-   :width: 4.70625in
-   :height: 3.55694in
+   :width: 600
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_20.rst b/docs/source/lesson_20.rst
@@ -44,8 +44,7 @@ blink interval will increases or decreases.
 **Step 1:** Build the circuit
 
 .. image:: media/image129.png
-   :width: 4.00833in
-   :height: 3.03125in
+   :width: 600
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_21.rst b/docs/source/lesson_21.rst
@@ -42,8 +42,7 @@ LED will be on. Otherwise it will be off.
 **Step 1:** Build the circuit
 
 .. image:: media/image132.png
-   :width: 3.38194in
-   :height: 4.18681in
+   :width: 450
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_22.rst b/docs/source/lesson_22.rst
@@ -50,8 +50,7 @@ The schematic diagram:
 **Step 1:** Build the circuit
 
 .. image:: media/image136.png
-   :width: 2.98889in
-   :height: 4.10208in
+   :width: 400
 
 **Passive Buzzer**
 
@@ -71,9 +70,7 @@ Now, you can hear the passive buzzer beeping. It also works in the same
 way if you use an active one here.
 
 .. image:: media/image137.jpeg
-   :alt: \_MG_0514
-   :width: 4.53403in
-   :height: 3.45972in
+   :width: 500
 
 **Active Buzzer**
 

diff --git a/docs/source/lesson_23.rst b/docs/source/lesson_23.rst
@@ -47,8 +47,7 @@ transmission. The schematic diagram is as follows:
 **Step 1:** Build the circuit
 
 .. image:: media/image140.png
-   :width: 6.55833in
-   :height: 3.31389in
+   :width: 800
 
 **Step 2:** Open the code file
 
@@ -65,5 +64,4 @@ transmission. The schematic diagram is as follows:
 Now, you can see the value of current temperature displayed on the LCD.
 
 .. image:: media/image141.jpeg
-   :width: 6.39236in
-   :height: 4.17986in
+   :width: 600
diff --git a/docs/source/lesson_24.rst b/docs/source/lesson_24.rst
@@ -78,8 +78,7 @@ LED. In this experiment, we use a common anode RGB LED.
 **Step 1:** Build the circuit
 
 .. image:: media/image145.png
-   :width: 5.62222in
-   :height: 4.20069in
+   :width: 600
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_25.rst b/docs/source/lesson_25.rst
@@ -63,6 +63,4 @@ pin 13 on the SunFounder Uno board will light up. Then press any other
 key, and the LED will go out.
 
 .. image:: media/image149.jpeg
-   :alt: \_MG_000yh2
-   :width: 5.34514in
-   :height: 3.74514in
+   :width: 500
diff --git a/docs/source/lesson_26.rst b/docs/source/lesson_26.rst
@@ -43,8 +43,7 @@ changes from red to green as well as flashes a mixed color.
 **Step 1:** Build the circuit
 
 .. image:: media/image151.png
-   :width: 3.75in
-   :height: 3.98958in
+   :width: 450
 
 **Step 2:** Open the code file
 
@@ -62,6 +61,4 @@ Now, you can see the dual-color LED changes from red to green
 alternately, as well as flashing a mixed color during the alternation.
 
 .. image:: media/image152.jpeg
-   :alt: \_MG_0539
-   :width: 4.88611in
-   :height: 3.74722in
+   :width: 600
diff --git a/docs/source/lesson_27.rst b/docs/source/lesson_27.rst
@@ -58,6 +58,4 @@ volume reaches to a certain value, the LED attached to pin 13 on the
 SunFounder Uno will light up.
 
 .. image:: media/image155.jpeg
-   :alt: 图片2
-   :width: 5.09861in
-   :height: 3.72986in
+   :width: 600
diff --git a/docs/source/lesson_28.rst b/docs/source/lesson_28.rst
@@ -106,6 +106,4 @@ decreases. Press the switch on the rotary encoder, the value will return
 to zero.
 
 .. image:: media/image160.jpeg
-   :alt: \_MG_0541
-   :width: 6.67292in
-   :height: 4.55694in
+   :width: 600
diff --git a/docs/source/lesson_29.rst b/docs/source/lesson_29.rst
@@ -62,7 +62,7 @@ produce pulses of light—as short as a femtosecond.
 Now, you can see the Laser Transmitter module send out Morse signals.
 
 .. image:: media/image163.jpeg
-  :width: 600
+  :width: 800
 
 .. note:: 
     DO NOT look directly at the laser head. It can cause great harm to your eyes.
diff --git a/docs/source/lesson_3.rst b/docs/source/lesson_3.rst
@@ -64,8 +64,7 @@ The wiring between the passive buzzer and SunFounder Uno board:
 +-----------------------------------+-----------------------------------+
 
 .. image:: media/image73.png
-   :width: 3.55556in
-   :height: 4.74792in
+   :width: 500
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_30.rst b/docs/source/lesson_30.rst
@@ -50,7 +50,7 @@ low and the LED lights up. See the schematic diagram below.
 **Step 1:** Build the circuit
 
 .. image:: media/image165.png
-   :width: 500
+   :width: 600
 
 **Step 2:** Open the code file
 
@@ -72,6 +72,4 @@ SunFounder Uno board will light up; otherwise, it is off.
     The black line should be wider than the TCRT5000 sensor.
 
 .. image:: media/image166.jpeg
-   :alt: \_MG_0547
-   :width: 6.65972in
-   :height: 4.44028in
+   :width: 600
diff --git a/docs/source/lesson_31.rst b/docs/source/lesson_31.rst
@@ -54,8 +54,7 @@ The schematic diagram is as follows:
 **Step 1:** Build the circuit
 
 .. image:: media/image168.png
-   :width: 3.05278in
-   :height: 4.44931in
+   :width: 400
 
 **Step 2:** Open the code file
 
@@ -77,15 +76,11 @@ up.
     The obstacle should better be white.
 
 .. image:: media/image169.jpeg
-   :alt: \_MG_0553
-   :width: 4.47569in
-   :height: 3.77986in
+   :width: 600
 
 Before
 
 .. image:: media/image170.jpeg
-   :alt: \_MG_0552
-   :width: 5.96806in
-   :height: 3.71111in
+   :width: 600
 
 With obstacle
diff --git a/docs/source/lesson_32.rst b/docs/source/lesson_32.rst
@@ -124,4 +124,4 @@ The wiring between the color sensor and SunFounder Uno board:
 Now you may check the RGB value of the color on Serial Monitor.
 
 .. image:: media/image174.jpeg
-   :width: 600
+   :width: 800
diff --git a/docs/source/lesson_33.rst b/docs/source/lesson_33.rst
@@ -88,8 +88,7 @@ The wiring between PCF8591 and SunFounder Uno board:
 +-------------------------------+--------------------------------------+
 
 .. image:: media/image178.png
-   :width: 5.08264in
-   :height: 3.97639in
+   :width: 600
 
 **Step 2:** Open the code file
 
@@ -108,4 +107,4 @@ gradually lights up and goes out alternately. The same happens to the
 LED attached to pin 13 of the SunFounder Uno board
 
 .. image:: media/image179.jpeg
-   :width: 500
+   :width: 600
diff --git a/docs/source/lesson_34.rst b/docs/source/lesson_34.rst
@@ -54,9 +54,7 @@ The schematic diagram is shown as below:
 **Step 1:** Build the circuit
 
 .. image:: media/image181.png
-   :alt: G:\电路图sensor kit\Frizting 图\33 Raindrop Sensor_bb.png
-   :width: 6.5in
-   :height: 3.31806in
+   :width: 600
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_35.rst b/docs/source/lesson_35.rst
@@ -51,7 +51,7 @@ The wiring between the ultrasonic sensor and SunFounder Uno board:
 +-----------------------------------+-----------------------------------+
 
 .. image:: media/image183.png
-   :width: 600
+   :width: 800
 
 **Step 2:** Open the code file
 

diff --git a/docs/source/lesson_36.rst b/docs/source/lesson_36.rst
@@ -135,8 +135,7 @@ The wiring between the I2C LCD1602 module and SunFounder Uno:
 +-------------------------------+--------------------------------------+
 
 .. image:: media/image185.png
-   :width: 6.74514in
-   :height: 4.44583in
+   :width: 600
 
 **Step 2:** Open the code file
 
@@ -167,6 +166,4 @@ decrease. When the value reaches the threshold, the contact is open,
 characters on the LCD blurred, and LED out.
 
 .. image:: media/image186.jpeg
-   :alt: 36
-   :width: 6.76389in
-   :height: 5.03194in
+   :width: 600
diff --git a/docs/source/lesson_4.rst b/docs/source/lesson_4.rst
@@ -51,8 +51,7 @@ The schematic diagram of the module:
 **Step 1:** Build the circuit
 
 .. image:: media/image77.png
-   :width: 3.71736in
-   :height: 4.50278in
+   :width: 450
 
 **Step 2:** Open the code file