Root Time Lapse Facility
AutoMaker V4.02.00 in combination with Root introduces a new facility to take time lapse images of a print as it progresses.
The facility requires a Robox Pro, or a Robox connected to a Root, AutoMaker running on a personal computer, a USB camera such as a Logitech C920 connected to the Root or Robox Pro, and a USB memory stick connected to the Root or Robox Pro. When enabled on a print, an image is when each layer is completed, and stored on the connected memory stick. There are many applications, such as Time Lapse Creator that can convert these images to a video, which show the printed object growing out of the bed.
In AutoMaker, the Network page shows which connected Roots have connected cameras.
If a Root has detected that a camera is connected, then the symbol in the camera column will be . If no camera is detected, or the Root is not connected, it will be .
If the currently selected printer is associated with a Root with a connected camera, a snapshot panel with two combo boxes and an image captured from the camera will be displayed on the printer status page.
The left combo box selects a “camera profile”. The right combo box selects a camera. The image is updated every second or so.
A camera profile specifies a collection of settings for a camera. They can be inspected, created and edited in the Camera Profile page in the Library. Click the library button at the top right and select “Camera Profiles”.
Profiles supplied with AutoMaker cannot be changed, but copies are easily created and can be edited. Click “New” at the bottom of the screen. Type a unique name into the combo box at the top and press the tab key to complete the name. All the fields should now become editable. Click “Save” at the bottom to save the profile.
The settings are grouped in sections and are described below.
||Turns off the headlight before capturing an image, then turns it back on
|Ambient Light Off
||Turns off the ambient light before capturing an image, then turns it back on.
|Move Before Capture
||Move the head to a specified position in X and Y before capturing an image. (Z will increase as the print progresses.)
|Move To X
||X position to which the head is moved.
|Move To Y
||Y position to which the head is moved.
||Specifies the name of the camera for which this profile is intended. If set to (Any Camera), then it can be used with any camera. Otherwise, if selected, only cameras with the specified name will be available for selection in the Camera combo box.
||The width of the captured image in pixels.
||The height of the captured image in pixels.
Root uses a camera utility called “fswebcam” to capture images. This has a number of controls and settings. Exactly which controls are available, and the effect they have depends on the type of camera connected. The Control section is provided so that any required settings for a camera can be passed to the fswebcam facility.
In our experience, we have found that many USB cameras do not work well on the Raspberry Pi. One that does work well is the Logitech C920.
There are two types of control settings: command line settings for fswebcam are prefixed by “—“ and are passed to fswebcam as command line arguments. Control settings have no prefix and are passed to fswebcam as “—set setting=value”. For full details of all the available settings, please see the fswebcam documentation here: http://manpages.ubuntu.com/manpages/bionic/man1/fswebcam.1.html
Command line settings should be used with care as some settings may cause fswebcam to hang, return multiple images or none at all. Note that banners are always disabled. A couple of useful settings are described below.
||Specifies the number of frames to skip before capturing an image. Useful if, for example the camera automatically adjusts it exposure settings
||Number of seconds to delay before capturing an image. Useful if the camera requires a little time to settle before a reliable image is captured.
Below is a list of some