Last week while I was watching some videos on Vimeo looking for inspiring material, I hit the jackpot: “Immaterials: the ghost in the field”. I was so intrigued by their work; I didn’t even pay attention to the publishing date (2 years ago). While watching the video ideas started rushing through my head, since for a while I’ve been working with RFID and always faced problems with the reading field of the antennas. Of course going to the datasheets and trying to figure out the reading volume’s shape could be one possibility, but it’s just not “real” enough. I wanted to know more about the people behind this project and reached nearfield.org. The research was complete, the papers were published, the website was last updated in 2011 but people were still posting comments.
I started wondering what happened to this amazing technique, and why no one has pursued this study. In the meantime, while I could not argue the beauty of the outcome of this technique I couldn’t resist not thinking of how inefficient, time consuming and limited it was. So I decided to design my own tool that could take this research a step further.
RFID Reading Volume 3D Mapping Probe:
The concept is simple; it is visualized in the diagram below:
The diagram is at a very high level of abstraction and it’s not worth going into its details at the moment as some components might vary upon implementation. However, I’m gonna describe what is illustrated above:
- The Probe is made out of 5 modules:
- RFID Tag
- Coordinates Recording module
- Once the Probe, specifically the Tag (1a) is at a reading distance from the RFID antenna, the reader dispatches a signal to the processing software layer that will in turn trigger the recording algorithm.
- The recording algorithm will ask the Controller to grab data from the 2 modules (1b and 1c) and will ask the LED (1d) to blink.
- The data is then gather, analyzed, stored and the coordinates with the accelerometer data will be used to draw 3D point cloud of the reading volume.
To be more specific, I drew a simple annotated sketch of how the probe might look like:
This design is currently pending a prototype. I’m gonna be working on it as of next week. I’ll update this post accordingly.
I will choose one of these 2 paths:
- Develop a mobile application and embed the missing modules to a smart phone and have the application do all the logic.
- Implement the probe using an open source controller (Arduino and the likes). I’m sure I will not need much processing power on the Probe level since all the work will be done by the controlling pc.
Since this is a side project, I will neglect all business value of this project and focus on the personal educational benefit; maybe some student, researcher might find value in this work as well. I have not yet done my homework with regard to looking for off the shelf solutions; I am going to work on it either way, even if some argue that I’ll be re-inventing the wheel.