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# Stack-chan case
[日本語](./README_ja.md)
Currently the [case data](https://a360.co/3gcw960) is developed with Fusion360.
## Editing
You can import and edit STEP files in each directory using any CAD software.
## 3D Printing
You can print STL files in each directory.
The recommended orientation is below.
## Assembly
### Parts
* 3D-printed cases
* Shell
* Feet
* Bracket
* Battery backpack
* M5Stack Core Basic/Gray/Go/Fire
* [Stack-chan board](../schematics/README.md)
* Two servos
* Currently available on:
* [RS30X series(TTL version)](https://www.vstone.co.jp/robotshop/index.php?main_page=product_info&products_id=2685) serial servo
* [SCS0009(TTL version)](https://www.switch-science.com/catalog/8042/) serial servo
* [SG-90 pwm servo](https://akizukidenshi.com/catalog/g/gM-08761/)
* 3.7V Battery with PH 2-pin cable
* Tested on:
* [lithium polymer 400mAh battery](https://www.sengoku.co.jp/mod/sgk_cart/detail.php?code=EEHD-4YZL))
* [lithium polymer 640mAh battery](https://www.sengoku.co.jp/mod/sgk_cart/detail.php?code=EEHD-5GHY))
* Screws
* M2 4mm * 4pcs
* M2 8mm * 2pcs
* (Optional) M3 15mm * 2本
### Serial Servo Setup
Serial servos share a signal line. It's necessary to specify ID for controlling each servo.
Therefore, different IDs must be assigned in advance.
- ID1: Foot side (left-right rotation, pan axis)
- ID2: Face side (vertical rotation, tilt axis)
The serial servo driver has a command `flashId` to rewrite IDs](https://github.com/meganetaaan/moddable-scservo/blob/71292b9358353837a74ecea387cd3265a 610479f/src/scservo.ts#L274). A servo configuration tool using this command is under development.
### About the angle of the servo
The angle of the servo mounting should be as follows.
- The center of the movable range is the reference angle (the angle when the stack chan faces forward).
- Install the servo so that the convex of the cross-shaped servo horn is aligned with the reference angle.
- If the servo is installed in the wrong direction, it will interfere with the stack chamber housing and will not operate properly.
- We recommend that you check the operation of the servo by writing the firmware once before fixing the servo to the case.
- The movable range and reference angle are different for each servo type (see the following table).
|Servo |Movable range |Reference angle |
|:------|:---------|:------|
|SG-90 |0~180 degrees |90 degrees |
|RS30X |-150~150 degrees |0 degrees |
|SCS0009|0~200 degrees |100 degrees |
### Set up SCS0009 with GUI
Set up the following settings using Feetech's official GUI tool.
* Change the ID of the servo
* Change the angle of the servo to the reference angle
In addition to the SCS0009, the following items are required.
* [URT1](https://www.switch-science.com/catalog/7490/)
* 6-9V power supply
* Download the GUI debugging tools from [Feetech's repository on gitee](https://gitee.com/ftservo/fddebug).
* Connect URT1
* "DC6V-9V"...Power supply
* "USB"...PC via microUSB cable
* "G V1 S"...SCS0009 (Connecting multiple servos with the same ID will not work properly)
* Open `FD.exe`
* Select the COM port that URT1 is connected to, and select "Connect" without changing other values from default.
* Select "Scan"
* Select the servo connected to the URT1 as shown in the lower left corner of the screen.
* Set the value of "Goal" to 511 and select "Set"
* The servo rotate to the reference angle
* If you change the servo's ID, Open the "Programming" tab
* Select the "ID" row, change the value and select "Save".
* The ID is rewritten.
__Note: If you select "Recovery", the servo will not work properly__.
### How to Assemble
(Here are the steps with RS304MD servo. SG-90 and SCS0009 is similar to them)
#### Bracket and Battery backpack
* Snap two servos into the bracket.
* Insert battery into the backpack.
* Insert the battery pack into the bracket by hooking the claws.
#### Shell and Feet
* Fix feet and shell with screws(M2-8mm * 1pc for each of them).
#### M5Stack and board
* Connect servo and battery cables to the board. Double check the direction of each connector is correct.
* For serial servos, the servo with ID: 1 is for the foot side (pan axis) and the servo with ID: 2 is for the face side (tilt axis).
For SCS0009, The signal line (white cable) is connected to write the pin.
* Fix the board on the robot with screws(M2-4mm * 4pcs)
* Stack M5Stack on the robot.
* If you want to fix the M5Stack, use the two holes below to screw(M3-15mm * 2pcs) it in place.