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This page provides information on how to purchase or assemble 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 acrylonitrile butadiene styrene (ABS) 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 ABS components with a laser cutter, apply vinyl stickers to the plastic box to get the proper color control on the interior of the test box:
Apply vinyl on the smooth side of the ABS as shown in Figure 2. For helpful tips on applying vinyl, refer to wikiHow{: .external}.
Cut out the necessary holes on the vinyl with the exacto knife.
To prepare the phone mount to attach to the servo:
Tap 16 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 a #43 drill bit (2.26 mm) into the last holes from each side so 4-40 screws can be inserted through the holes.
Insert and tighten the flat-head 4-40 screws as shown in figure 5 on the front of the phone fixture and tighten the shaft as shown in figure 6.
To attach the phone clamps:
Apply nylon thumb screws, rubber adhesive, and wire spring to the aluminum clamp.
Screw the phone clamps' thumb screws into the tapped holes of the phone fixture as shown in figure 8. You can adjust the location of the phone mounts depending on the size of the phones as shown in figure 9.
Mechanical drawing:
Phone mounts attachment to phone fixture:
Fix sliding panel rails on the top and bottom of the box towards the front. Figure 10 shows 6-32 screws on pre-tapped holes. Alternatively, you can use self-tapping screws.
To attach the light brackets and diffuser:
Stack two handle pieces on top of each other and assemble them using 6-32 screws (or use self-tapping screws).
Prepare four 4-40 screws, nuts, and acorn nuts to fix the mounting bracket from the lighting kit to the wall of the box.
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.
Snap the lights into the brackets (can be a tight fit).
To attach the phone fixture to the servo plate:
Prepare four 6-32 screws and a servo plate to fix the servo onto the wall. Fix the servo onto the interior wall and insert the screws from the inside into the servo plate on the exterior 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 assembly of the Sensor Fusion Box:
Secure servo control box on the left of the servo with 4-40 screws from the outside and fasten from the inside with nuts.
Tape the box together, then screw the parts together (you might need to pre-drill holes in some parts).
Assembled 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.