Build your own cheap IMU-based objects for use with AR or VR

Manipulation of objects is one of the most fundamental tasks in everyday life. To further enhance the immersion of the user in Augmented and Virtual Reality Environments, objects and their virtual representation are added, making the experience more authentic.

In the following article, a guide to the development of a low-cost IMU-based object is presented.

Wireless Internet connected cube with IMU

 

Material & Assembly

In order to assemble an instrumented object like the one presented in the image above, you'll need the following material:

1 x ESP8266, 1 x MPU-9250 (alternatively you can use a MPU-6050), 1 x Universal PCB, 1 x 3.3V Voltage Regulator, 1 x battery, preferably a header that suits the battery to be used (alternatively a 2-pin right angle header can be used), 1 x single socket female header, 1 x two socket female header and a Capacitor (6.3V 100 microfarad).

Material required for object instrumentation

 

Note: Don't forget your soldering material, it's also required for the assembly.

Hardware Assembly

Start by soldering the battery header (or a 2-pin right angle header) to the Universal PCB, you may wanna do this in the corner of the board if your goal is to make the design as small as possible. Next, solder both female headers to the PCB and make the necessary connections between them and the battery header (look at the figure bellow), these will be where you’ll connect the ESP and the MPU. Be careful to leave enough space between the headers (at least 3 holes of the PCB), in order to avoid the ESP and MPU bending/pressuring each other. After this, connect the positive and negative ends of the battery header to the Input and GND of the voltage regulator, respectively.

Finally, lets make the connections to the Capacitor, connect the GND and the output of the regulator to the negative and positive end of the capacitor, alternatively you can connect the negative of the capacitor directly to the negative of the battery if it’s easier.

The following image, show the required connections for the assembly of the instrumented object.

Hardware required connections

Cube Assembly

In the following link you can get the layout of the cube with the fiducial markers, presented before. Its assembly is pretty straightforward, just print the layout, cut through the guide lines and glue it together. Beware, the folding flaps of the cube aren’t present in the layout, so you can use the ones that help you the most.

 

If you found the tutorial above useful, we’d appreciate that you reference us. You can do so by adding the following to your bibliography:

@inproceedings{cuberev, address = {Columbia University, New York, USA}, author = {Menezes, Paulo and Gouveia, Nuno and Patr{\~{a}}o, Bruno}, booktitle = {14th International Conference on Remote Engineering and Virtual Instrumentation - REV 2017}, title = {{Touching is believing - Adding real objects to Virtual Reality}}, year = {2017}}