More tests on coils

First box prototype

Zennedine finds a way to use our coils, so I tried to make a first box to check if it will not collapse. I made this and I checked if the marble flip or not, and it works.

Coils no more available

When we begin our project, we ship some coils, the 74458303 but in a short time, we cannot ship enough coils for the project. So I tried with the same configuration to use the 74458304 coils, and it works, even if there were more edge effect (the nearest coils flip sometimes). With these coils, we need only 0.59A… Read more

Update on Phyllos detection

Magnetic deception

Last week, we thoroughly tested the MPU9250 that Alexis lent us. At first glance, it looked a lot more promising than the TLV493D-A1B6 MS2GO () we tried before : the range is way better ! Unfortunately, magnetic detection is more complicated than we first thought and it looks like it’s not going to cut it.

You can take a look at this post to remind you of the detection scheme we had in mind.

Essentially, the idea is to use electromagnet in every Phyllo that can be turned on and off, so as to detect the Phyllos one after another, and use Wifi or Bluetooth to coordinate.… Read more

Marbles: “I can’t let you go, I want you in my life”

Designing our grid

Have you ever played with some neodymium balls? These are potent magnets, so we had to find a way to use them in our device without making them dependent on the magnetic field of another marble. Because if we had to manage this field, we would have always to power our coils, and they would have burnt. That’s why we choose to buy many different balls to try to find the best compromise between the distance and the diameter of the marbles.

With a plank of beech, we cut with a laser engraver. We made many different holes of many diameters with various distance to know which one is the best.… Read more

The magnet strikes back

In a previous post we discussed several ideas on how to detect the direction of neighbouring Phyllos relative to a given Phyllo. Our favourite idea in this post was based on a mix of Wifi and IR : the Phyllos would cooperate using Wifi to turn their IR emitters on one at a time to allow the others to detect it using IR detectors.

But this idea raises several problems. The most notable is IR reflections : they could spoof the Phyllos into detecting neighbours in the wrong directions. We thought we would be able to differentiate an IR reflection from a direct emission by comparing the amplitudes, but according to Alexis, we will have too much trouble.… Read more

Communicating between Phyllos : Who’s Who ?

In order to display animations that flow back and forth between several Phyllo, the Phyllos need first to be able to know each other’s position. 

For now, we have reduced this problem to this : to display animations in the proper orientation relative to its neighbours, each Phyllo needs to know the direction of each neighboring Phyllo. They have no real need to know exactly how far they are from each other.

Associating detection and communication

It is not enough to merely detect Phyllos if the detection method doesn’t allow us to distinguish one Phyllo from another. We have to be able to both talk to a specific Phyllo AND know where it is physically located.… Read more