The Bottom Camera is a upward looking camera fixed to the machine, and not the head. The Bottom Camera is used during Bottom Vision processing to more accurately place parts. It's not required to have a Bottom Camera, but you will generally get better results if you do have one.

First, add a camera by following the instructions in General Camera Setup. Make sure to configure each section before returning to this page to continue.

Many Bottom Cameras tend to use much shorter fisheye lenses, so pay careful attention to the Lens Calibration section in the document above. It's likely to be more important for the Bottom Camera than the Top Camera.

OpenPnP needs to know where on the machine the bottom camera is.

1. Open the Cameras tab and select the Bottom Camera.
2. Select the Camera Specific configuration tab on the right.
3. Scroll down to the Location group.
4. Jog the primary nozzle so that it is perfectly centered and in focus over the camera.
5. Click the capture tool location button to grab the location of the nozzle, thereby setting the camera location.
6. Press Apply to save your changes.

Now that OpenPnP knows where the camera is, let's move the nozzle around and make sure everything looks right.

1. Hold Shift and then Left Click the mouse in the camera view for the bottom camera.
2. The nozzle will move to the camera and should land where you clicked.
3. Using the jog controls, move the nozzle forward, backward, left and right while looking at the camera view.
4. Make sure that when you click arrows to move nozzle, in the camera view the nozzle moves in the same direction. For example if you click the up arrow nozzle should move vertical on your screen. If it doesn't, you may need to adjust the rotation and transforms of the camera.

The Camera can optionally enable Auto-Focus capabilities. See the Up looking Camera Auto Focus page. This can be used to set the precise Z location of the camera (which is the focal plane).