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This page provides step-by-step instructions for assembling a Sensor Fusion Box. The Sensor Fusion Box is used in the CameraITS sensor_fusion test and multi-camera sync test. It provides a consistent test environment for measuring timestamp accuracy of camera and other sensors for Android phones. It consists of plastic box components that are laser cut from computer-aided design (CAD) drawings and a Servo Control Box.
You can purchase a Sensor Fusion Box or build your own.
We recommend purchasing a Sensor Fusion Box from one of the following qualified vendors.
This section includes step-by-step instructions for assembling a Sensor Fusion Box from laser-cut plastic components (shown in Figure 1):
Before starting, ensure you have downloaded the technical drawings for the Sensor Fusion Box (included in the Sensor Fusion Box zip file) and have the following tools available:
After creating the plastic components with a laser cutter, you can apply vinyl stickers to the plastic box components:
Apply vinyl on the smooth side of the ABS (acrylonitrile butadiene styrene) as shown in Figure 2. For helpful tips on applying vinyl, refer to wikiHow{: .external}.
Cut out the necessary holes on the vinyl.
To attach the servo:
Tap three holes on the phone fixture with ΒΌ" - 20, and make countersink holes on the back of the phone fixture:
With the large shaft that came with the servo, drill pilot holes with #43 drill bit (2.26 mm) into the last holes from each side so 4-40 screws could grab onto them:
Apply the flat-head 4-40 screws on the front of the phone fixture and tighten the shaft:
To attach the clamp and rails:
Apply nylon thumb screws, rubber adhesive, and wire to the aluminum clamp:
Screw the phone clamps' thumb screws into the tapped holes of the phone fixture.
CAD Drawing:
Actual clamp attachment to phone fixture:
Fix rails on top and bottom of box towards the front. The figure below shows 6-32 screws on pre-tapped holes, but you can use self-tapping screws instead if desired.
To attach the light brackets and diffuser:
Stack two handle pieces and connect using 6-32 screws (or use self-tapping screws):
Prepare four 4-40 screws and nuts to fix the mounting bracket from the lighting kit to the wall of the box:
Snap the lights into the brackets (can be a tight fit):
Cut the light diffuser to an appropriate size to wrap the light strips:
Wrap the light diffuser around the strip and tape it at the back:
To attach the phone fixture to the servo plate:
Prepare four 6-32 screws and servo plate to fix the servo onto the wall. The screws go from inside and fix themselves onto the servo plate that is on the exterior of the wall.
Secure phone fixture onto the servo with nylocks (pushing the center of the shaft into the servo's rotation center):
Screw the phone fixture onto the servo with its servo screw:
To complete final assembly of the Sensor Fusion Box:
Secure servo control box on the left of the servo with 4-40 screws from the outside and fastened from the inside with nuts:
Tape the box together, then screw the parts together (you might need to pre-drill some holes in some parts).
CAD drawing:
Actual Sensor Fusion Box:
Print out a colored copy of the checkerboard (included in the Sensor Fusion Box zip file) on A3 (or 11 x 17 inch paper), and tape it on the opposite wall of the phone fixture.
Make sure the red dot in the center of the checkerboard is directly facing the camera when placed on the fixture, as shown below:
<img src="/compatibility/cts/images/sensor_fusion_assembly_checkerboard.png" width="350" alt="Checkerboard"> **Figure 23.** Checkerboard printed and taped to the opposite wall of phone fixture