diff --git a/README.md b/README.md
index ffbfda7..5b4be40 100644
--- a/README.md
+++ b/README.md
@@ -21,8 +21,104 @@ The table below shows the difference between this project and the original one.
 
 ## Gallery
 
-## Instructions
+## Mechanism
 
-1. [Mechanism](mechanism/)
-1. [Electronic](electronic/)
-1. [Software](software/)
+### Bill of Materials (BOM)
+
+#### Servos
+
+18 TowerPro [MG92B](http://www.towerpro.com.tw/product/mg92b/) are required.
+
+> The dimension of 3d printed part is highly dependent on the servo's size. Modification is required if you want to use alternative servos.
+
+#### 3D-Printed Parts
+
+##### Body x 1
+
+| Filename       | Thumbnail                                                               | Required |
+| -------------- | ----------------------------------------------------------------------- | -------- |
+| body_top       | <img src="./imgs/body_top.jpg" alt="body_top" width="300"/>             | 1        |
+| body_bottom    | <img src="./imgs/body_bottom.jpg" alt="body_bottom" width="300"/>       | 1        |
+| body_side_wall | <img src="./imgs/body_side_wall.jpg" alt="body_side_wall" width="300"/> | 2        |
+| body_back_wall | <img src="./imgs/body_back_wall.jpg" alt="body_back_wall" width="300"/> | 1        |
+| battery_box    | <img src="./imgs/battery_box.jpg" alt="battery_box" width="300"/>       | 1        |
+| battery_holder | <img src="./imgs/battery_holder.jpg" alt="battery_holder" width="300"/> | 2        |
+
+##### Leg x 6
+
+| Filename        | Thumbnail                                                                 | Required |
+| --------------- | ------------------------------------------------------------------------- | -------- |
+| thigh_top       | <img src="./imgs/thigh_top.jpg" alt="thigh_top" width="300"/>             | 1 (x6)   |
+| thigh_bottom    | <img src="./imgs/thigh_bottom.jpg" alt="thigh_bottom" width="300"/>       | 1 (x6)   |
+| joint_cross     | <img src="./imgs/joint_cross.jpg" alt="joint_cross" width="300"/>         | 1 (x6)   |
+| joint_top       | <img src="./imgs/joint_top.jpg" alt="joint_top" width="300"/>             | 2 (x6)   |
+| joint_bottom    | <img src="./imgs/joint_bottom.jpg" alt="joint_bottom" width="300"/>       | 2 (x6)   |
+| leg_top         | <img src="./imgs/leg_top.jpg" alt="leg_top" width="300"/>                 | 1 (x6)   |
+| let_bottom      | <img src="./imgs/leg_bottom.jpg" alt="leg_bottom" width="300"/>           | 1 (x6)   |
+| foot_top        | <img src="./imgs/foot_top.jpg" alt="foot_top" width="300"/>               | 1 (x6)   |
+| foot_bottom     | <img src="./imgs/foot_bottom.jpg" alt="foot_bottom" width="300"/>         | 1 (x6)   |
+| foot_ground     | <img src="./imgs/foot_ground.jpg" alt="foot_ground" width="300"/>         | 1 (x6)   |
+| foot_tip        | <img src="./imgs/foot_tip.jpg" alt="foot_tip" width="300"/>               | 1 (x6)   |
+| servo_horn_j1j2 | <img src="./imgs/servo_horn_j1j2.jpg" alt="servo_horn_j1j2" width="300"/> | 2 (x6)   |
+| servo_horn_j3   | <img src="./imgs/servo_horn_j3.jpg" alt="servo_horn_j3" width="300"/>     | 1 (x6)   |
+
+#### Others
+
+| Name      | Spec    | Thumbnail                    | Required | Note                                              |
+| --------- | ------- | ---------------------------- | -------- | ------------------------------------------------- |
+| Screw     | M2 6mm  | ![6mm](imgs/M2_6mm.JPG)     | 54       | Servo Arm: 1 x 18<br>Joint: 4 x 6<br>Thigh: 2 x 6 |
+| Screw     | M2 10mm | ![10mm](imgs/M2_10mm.JPG)   | 24       | Thigh: 1 x 6<br>Pin lock: 1 x 18                  |
+| Screw     | M2 30mm | ![30mm](imgs/M2_30mm.JPG)   | 36       | Servo: 2 x 18                                     |
+| Nuts      | M2      | ![6mm](imgs/M2_nut.JPG)     | 36       | Servo: 2 x 18                                     |
+| Pin (304) | M4 6mm  | ![pin](imgs/pin_M4_6mm.JPG) | 18       | Servo: 1 x 18                                     |
+
+### Leg Assemble
+
+#### Assembly video
+
+<a href='https://youtu.be/oaAE5fC09KQ'><img src='http://img.youtube.com/vi/oaAE5fC09KQ/mqdefault.jpg'/></a>
+
+#### Exploded view
+
+<img src="./imgs/mech_leg_exploded.jpg" alt="LegAssemble" width="500"/>
+
+#### Detailed steps
+
+- **Step 1** - Combine `thigh_top`, `MG92B` and `thigh_bottom`, use M2x30mm screw and nut to secure them together.
+
+<img src="./imgs/mech_leg_1.jpg" alt="LegAssemble1" width="500"/>
+
+- **Step 2** - Grab one `joint_cross`, `joint_top` and `joint_bottom` and combine them
+
+<img src="./imgs/mech_leg_2.jpg" alt="LegAssemble2" width="500"/>
+
+- **Step 3** - First put 2 x `MG92B`, `leg_top` and `leg_bottom` together with M2x30mm screw and nut. Then attach `joint_top` and `joint_bottom` altogether
+
+<img src="./imgs/mech_leg_3.jpg" alt="LegAssemble3" width="500"/>
+
+- **Step 4** - Grab `foot_top`, `foot_bottom` and `foot_ground` (and `foot_top`) and assemble them.
+
+<img src="./imgs/mech_leg_4.jpg" alt="LegAssemble4" width="500"/>
+
+- **Finish** - Great, you got 1 leg done, 5 more to go :)
+
+<img src="./imgs/mech_leg_5.jpg" alt="LegAssemble5" width="500"/>
+
+## Electronics
+
+### Bill of Materials (BOM)
+
+| Name       | Thumbnail                                                               | Required |
+| -------------- | ----------------------------------------------------------------------- | -------- |
+| Raspberry Pi Zero W or W 2 | <img src="./imgs/zero2-close-up.webp" alt="raspberry pi" width="300"/> | 1        |
+| PCA9685 motor driver       | <img src="./imgs/PCA9685.jpg" alt="PCA9685" width="300"/>              | 2        |
+| XL4005 DC-DC step down     | <img src="./imgs/XL4005.jpg" alt="XL4005" width="300"/>                | 2        |
+| Mini 360 DC-DC step down   | <img src="./imgs/mini360.jpg" alt="mini360" width="300"/>              | 1        |
+| Toggle switch              | <img src="./imgs/toggle_switch.jpg" alt="toggle_switch" width="300"/>  | 1        |
+
+### Connection Diagram
+
+<img src="./imgs/diagram.svg" alt="diagram" width="800"/>
+
+
+## Software
diff --git a/electronic/README.md b/electronic/README.md
deleted file mode 100644
index ce8ee05..0000000
--- a/electronic/README.md
+++ /dev/null
@@ -1,15 +0,0 @@
-# Electronics
-
-## Bill of Materials (BOM)
-
-| Name       | Thumbnail                                                               | Required |
-| -------------- | ----------------------------------------------------------------------- | -------- |
-| Raspberry Pi Zero W or W 2 | <img src="./imgs/zero2-close-up.webp" alt="raspberry pi" width="300"/> | 1        |
-| PCA9685 motor driver       | <img src="./imgs/PCA9685.jpg" alt="PCA9685" width="300"/>              | 2        |
-| XL4005 DC-DC step down     | <img src="./imgs/XL4005.jpg" alt="XL4005" width="300"/>                | 2        |
-| Mini 360 DC-DC step down   | <img src="./imgs/mini360.jpg" alt="mini360" width="300"/>              | 1        |
-| Toggle switch              | <img src="./imgs/toggle_switch.jpg" alt="toggle_switch" width="300"/>  | 1        |
-
-## Connection Diagram
-
-<img src="./imgs/diagram.svg" alt="diagram" width="800"/>
diff --git a/mechanism/imgs/M2_10mm.JPG b/imgs/M2_10mm.JPG
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rename from mechanism/imgs/M2_10mm.JPG
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diff --git a/mechanism/imgs/M2_30mm.JPG b/imgs/M2_30mm.JPG
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rename from mechanism/imgs/M2_30mm.JPG
rename to imgs/M2_30mm.JPG
diff --git a/mechanism/imgs/M2_6mm.JPG b/imgs/M2_6mm.JPG
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rename from mechanism/imgs/M2_6mm.JPG
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diff --git a/mechanism/imgs/M2_nut.JPG b/imgs/M2_nut.JPG
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rename to imgs/M2_nut.JPG
diff --git a/electronic/imgs/PCA9685.jpg b/imgs/PCA9685.jpg
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rename to imgs/PCA9685.jpg
diff --git a/electronic/imgs/XL4005.jpg b/imgs/XL4005.jpg
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rename to imgs/XL4005.jpg
diff --git a/mechanism/imgs/battery_box.jpg b/imgs/battery_box.jpg
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rename to imgs/battery_holder.jpg
diff --git a/mechanism/imgs/body_back_wall.jpg b/imgs/body_back_wall.jpg
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rename from mechanism/imgs/body_back_wall.jpg
rename to imgs/body_back_wall.jpg
diff --git a/mechanism/imgs/body_bottom.jpg b/imgs/body_bottom.jpg
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rename from mechanism/imgs/body_bottom.jpg
rename to imgs/body_bottom.jpg
diff --git a/mechanism/imgs/body_side_wall.jpg b/imgs/body_side_wall.jpg
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rename from mechanism/imgs/body_side_wall.jpg
rename to imgs/body_side_wall.jpg
diff --git a/mechanism/imgs/body_top.jpg b/imgs/body_top.jpg
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rename from mechanism/imgs/body_top.jpg
rename to imgs/body_top.jpg
diff --git a/electronic/imgs/diagram.svg b/imgs/diagram.svg
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rename to imgs/diagram.svg
diff --git a/mechanism/imgs/foot_bottom.jpg b/imgs/foot_bottom.jpg
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rename to imgs/foot_bottom.jpg
diff --git a/mechanism/imgs/foot_ground.jpg b/imgs/foot_ground.jpg
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rename from mechanism/imgs/foot_ground.jpg
rename to imgs/foot_ground.jpg
diff --git a/mechanism/imgs/foot_tip.jpg b/imgs/foot_tip.jpg
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rename from mechanism/imgs/foot_tip.jpg
rename to imgs/foot_tip.jpg
diff --git a/mechanism/imgs/foot_top.jpg b/imgs/foot_top.jpg
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rename from mechanism/imgs/foot_top.jpg
rename to imgs/foot_top.jpg
diff --git a/mechanism/imgs/joint_bottom.jpg b/imgs/joint_bottom.jpg
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rename from mechanism/imgs/joint_bottom.jpg
rename to imgs/joint_bottom.jpg
diff --git a/mechanism/imgs/joint_cross.jpg b/imgs/joint_cross.jpg
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rename from mechanism/imgs/joint_cross.jpg
rename to imgs/joint_cross.jpg
diff --git a/mechanism/imgs/joint_top.jpg b/imgs/joint_top.jpg
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rename from mechanism/imgs/joint_top.jpg
rename to imgs/joint_top.jpg
diff --git a/mechanism/imgs/leg_bottom.jpg b/imgs/leg_bottom.jpg
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rename from mechanism/imgs/leg_bottom.jpg
rename to imgs/leg_bottom.jpg
diff --git a/mechanism/imgs/leg_top.jpg b/imgs/leg_top.jpg
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rename from mechanism/imgs/leg_top.jpg
rename to imgs/leg_top.jpg
diff --git a/mechanism/imgs/mech_leg_1.jpg b/imgs/mech_leg_1.jpg
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rename from mechanism/imgs/mech_leg_1.jpg
rename to imgs/mech_leg_1.jpg
diff --git a/mechanism/imgs/mech_leg_2.jpg b/imgs/mech_leg_2.jpg
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rename from mechanism/imgs/mech_leg_2.jpg
rename to imgs/mech_leg_2.jpg
diff --git a/mechanism/imgs/mech_leg_3.jpg b/imgs/mech_leg_3.jpg
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rename from mechanism/imgs/mech_leg_3.jpg
rename to imgs/mech_leg_3.jpg
diff --git a/mechanism/imgs/mech_leg_4.jpg b/imgs/mech_leg_4.jpg
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rename from mechanism/imgs/mech_leg_4.jpg
rename to imgs/mech_leg_4.jpg
diff --git a/mechanism/imgs/mech_leg_5.jpg b/imgs/mech_leg_5.jpg
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rename from mechanism/imgs/mech_leg_5.jpg
rename to imgs/mech_leg_5.jpg
diff --git a/mechanism/imgs/mech_leg_exploded.jpg b/imgs/mech_leg_exploded.jpg
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rename from mechanism/imgs/mech_leg_exploded.jpg
rename to imgs/mech_leg_exploded.jpg
diff --git a/electronic/imgs/mini360.jpg b/imgs/mini360.jpg
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rename from electronic/imgs/mini360.jpg
rename to imgs/mini360.jpg
diff --git a/mechanism/imgs/pin_M4_6mm.JPG b/imgs/pin_M4_6mm.JPG
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rename from mechanism/imgs/pin_M4_6mm.JPG
rename to imgs/pin_M4_6mm.JPG
diff --git a/mechanism/imgs/servo_horn_j1j2.jpg b/imgs/servo_horn_j1j2.jpg
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rename from mechanism/imgs/servo_horn_j1j2.jpg
rename to imgs/servo_horn_j1j2.jpg
diff --git a/mechanism/imgs/servo_horn_j3.jpg b/imgs/servo_horn_j3.jpg
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rename from mechanism/imgs/servo_horn_j3.jpg
rename to imgs/servo_horn_j3.jpg
diff --git a/mechanism/imgs/thigh_bottom.jpg b/imgs/thigh_bottom.jpg
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rename from mechanism/imgs/thigh_bottom.jpg
rename to imgs/thigh_bottom.jpg
diff --git a/mechanism/imgs/thigh_top.jpg b/imgs/thigh_top.jpg
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rename from mechanism/imgs/thigh_top.jpg
rename to imgs/thigh_top.jpg
diff --git a/electronic/imgs/toggle_switch.jpg b/imgs/toggle_switch.jpg
similarity index 100%
rename from electronic/imgs/toggle_switch.jpg
rename to imgs/toggle_switch.jpg
diff --git a/electronic/imgs/zero2-close-up.webp b/imgs/zero2-close-up.webp
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rename from electronic/imgs/zero2-close-up.webp
rename to imgs/zero2-close-up.webp
diff --git a/mechanism/README.md b/mechanism/README.md
deleted file mode 100644
index bc068dd..0000000
--- a/mechanism/README.md
+++ /dev/null
@@ -1,82 +0,0 @@
-# Mechanism
-
-## Bill of Materials (BOM)
-
-### Servos
-
-18 TowerPro [MG92B](http://www.towerpro.com.tw/product/mg92b/) are required.
-
-> The dimension of 3d printed part is highly dependent on the servo's size. Modification is required if you want to use alternative servos.
-
-### 3D-Printed Parts
-
-#### Body x 1
-
-| Filename       | Thumbnail                                                               | Required |
-| -------------- | ----------------------------------------------------------------------- | -------- |
-| body_top       | <img src="./imgs/body_top.jpg" alt="body_top" width="300"/>             | 1        |
-| body_bottom    | <img src="./imgs/body_bottom.jpg" alt="body_bottom" width="300"/>       | 1        |
-| body_side_wall | <img src="./imgs/body_side_wall.jpg" alt="body_side_wall" width="300"/> | 2        |
-| body_back_wall | <img src="./imgs/body_back_wall.jpg" alt="body_back_wall" width="300"/> | 1        |
-| battery_box    | <img src="./imgs/battery_box.jpg" alt="battery_box" width="300"/>       | 1        |
-| battery_holder | <img src="./imgs/battery_holder.jpg" alt="battery_holder" width="300"/> | 2        |
-
-#### Leg x 6
-
-| Filename        | Thumbnail                                                                 | Required |
-| --------------- | ------------------------------------------------------------------------- | -------- |
-| thigh_top       | <img src="./imgs/thigh_top.jpg" alt="thigh_top" width="300"/>             | 1 (x6)   |
-| thigh_bottom    | <img src="./imgs/thigh_bottom.jpg" alt="thigh_bottom" width="300"/>       | 1 (x6)   |
-| joint_cross     | <img src="./imgs/joint_cross.jpg" alt="joint_cross" width="300"/>         | 1 (x6)   |
-| joint_top       | <img src="./imgs/joint_top.jpg" alt="joint_top" width="300"/>             | 2 (x6)   |
-| joint_bottom    | <img src="./imgs/joint_bottom.jpg" alt="joint_bottom" width="300"/>       | 2 (x6)   |
-| leg_top         | <img src="./imgs/leg_top.jpg" alt="leg_top" width="300"/>                 | 1 (x6)   |
-| let_bottom      | <img src="./imgs/leg_bottom.jpg" alt="leg_bottom" width="300"/>           | 1 (x6)   |
-| foot_top        | <img src="./imgs/foot_top.jpg" alt="foot_top" width="300"/>               | 1 (x6)   |
-| foot_bottom     | <img src="./imgs/foot_bottom.jpg" alt="foot_bottom" width="300"/>         | 1 (x6)   |
-| foot_ground     | <img src="./imgs/foot_ground.jpg" alt="foot_ground" width="300"/>         | 1 (x6)   |
-| foot_tip        | <img src="./imgs/foot_tip.jpg" alt="foot_tip" width="300"/>               | 1 (x6)   |
-| servo_horn_j1j2 | <img src="./imgs/servo_horn_j1j2.jpg" alt="servo_horn_j1j2" width="300"/> | 2 (x6)   |
-| servo_horn_j3   | <img src="./imgs/servo_horn_j3.jpg" alt="servo_horn_j3" width="300"/>     | 1 (x6)   |
-
-### Others
-
-| Name      | Spec    | Thumbnail                    | Required | Note                                              |
-| --------- | ------- | ---------------------------- | -------- | ------------------------------------------------- |
-| Screw     | M2 6mm  | ![6mm](imgs/M2_6mm.JPG)     | 54       | Servo Arm: 1 x 18<br>Joint: 4 x 6<br>Thigh: 2 x 6 |
-| Screw     | M2 10mm | ![10mm](imgs/M2_10mm.JPG)   | 24       | Thigh: 1 x 6<br>Pin lock: 1 x 18                  |
-| Screw     | M2 30mm | ![30mm](imgs/M2_30mm.JPG)   | 36       | Servo: 2 x 18                                     |
-| Nuts      | M2      | ![6mm](imgs/M2_nut.JPG)     | 36       | Servo: 2 x 18                                     |
-| Pin (304) | M4 6mm  | ![pin](imgs/pin_M4_6mm.JPG) | 18       | Servo: 1 x 18                                     |
-
-## Leg Assemble
-
-### Assembly video
-
-<a href='https://youtu.be/oaAE5fC09KQ'><img src='http://img.youtube.com/vi/oaAE5fC09KQ/mqdefault.jpg'/></a>
-
-### Exploded view
-
-<img src="./imgs/mech_leg_exploded.jpg" alt="LegAssemble" width="500"/>
-
-### Detailed steps
-
-- **Step 1** - Combine `thigh_top`, `MG92B` and `thigh_bottom`, use M2x30mm screw and nut to secure them together.
-
-<img src="./imgs/mech_leg_1.jpg" alt="LegAssemble1" width="500"/>
-
-- **Step 2** - Grab one `joint_cross`, `joint_top` and `joint_bottom` and combine them
-
-<img src="./imgs/mech_leg_2.jpg" alt="LegAssemble2" width="500"/>
-
-- **Step 3** - First put 2 x `MG92B`, `leg_top` and `leg_bottom` together with M2x30mm screw and nut. Then attach `joint_top` and `joint_bottom` altogether
-
-<img src="./imgs/mech_leg_3.jpg" alt="LegAssemble3" width="500"/>
-
-- **Step 4** - Grab `foot_top`, `foot_bottom` and `foot_ground` (and `foot_top`) and assemble them.
-
-<img src="./imgs/mech_leg_4.jpg" alt="LegAssemble4" width="500"/>
-
-- **Finish** - Great, you got 1 leg done, 5 more to go :)
-
-<img src="./imgs/mech_leg_5.jpg" alt="LegAssemble5" width="500"/>