Plume – LED


Today I have worked on the emitter with Guénolé. As we can’t have a cool project without LED, we have added 4 RGB LED on our emitter, and we will soon add 4 more.
We can choose the color of each led, but I still have problems went I want to make an animation.


Aside from that, this morning I have work on the joystick application of our system. I have selected and installed two open source First-Person Shooter that we will use to show how cool is our  project with video games (Xonotic and Unvanquished).

Plume – Calculator

Hi all,

After one week of work, I have finally succeded in making our first  simple version of the application work.
It display, thanks to blender, the position of a receiver in 3D space. If you are interested, watch this video :

We send the 9 simulated tensions through the zeroMQ socket and plot the position.
If we look at our architechure, The demonstration proves that the red blocks start to work.


Plume – Magnetic generator


I have good news today.
First, we figure out, with the help of Samuel, why our USB port was broken. We had a 6 Mhz clock wherease I though it was a 8 Mhz, as our schematic says.

Secoudly, our H Bridge works as expected.

The alternative intensity that is going through the coil have a magnitude of 1.1A.
And we have 20 periods to make our measures, a little more than expected.
Concerning my concerns for the heat, we are border line. We can’t increase the intensity.

Aside from that, today I have finished to code the interface, using ZeroMQ, between NodeJS that handle the BLE and the calculator.

Plume – PCB emitter

There you are !


The H bridge looks like to work normally.
However I can’t make the USB port work. Since my code works with an other board, I think there is a problem with the hardware.

Plume – Assembly of the emitter


Good news, we have received the pcb of the emitter and the software of the emitter is almost finished.
I hope to make the emitter work before the end of the week.

Besides that, I have started to develop one application of our system : the augmented reality.
Using blender, I can add the projection of a 3D model object over an other real object.

Plume – Emitter


These last days I have worked on the emitter. The PCB and the 3D model that we will print are almost finished.

Sans titre 12

Sans titre 1


P.S : We will have 8 RGB LEDs 🙂

Plume – Emitter RLC

Hi all.

Today I have worked on the RLC of the emitter. My aim was to maximize the magnetic field generated by the emitter, therefore the N*I parameter of the coils (NUMBER OF TURNS * CURRENT).
But I had different constraints.
The rise time (tr) of the transient response should be the shortest possible, less than 1/(200*4*6) = 200 us. Because we can’t easily make measure during the tr = 2*L/R.
The intensity I in the copper wire can’t go higher than 400 mA DC. I tried it, the copper was too hot.
The quality factor Q = fo*2*pi*L/R shouldn’t be too high neither too low.
The amplitude U of the tension applied to the RLC can’t be too high < 30V.

With U = 15V,  N = 63 (L = 700 uH), R = 10 ohm, C = 100 pF,
we should have a Q = 8, I = 1A, a tension of 1V at 20cm in the receiver coil and the following time response.

emetteur temporel

Now, I need to try with the L6206 (H-Bride of WAMI). I hope there isn’t maximum value acceptable for the capacity with a H-Bridge.

Plume – LNA

Good evening.

Since Sunday, we are choosing, with Guénolé, the components that we will use in the receiver and the emitter.
For the receiver, our biggest challenge is the noise. And I realize that designing our own circuit isn’t the better solution. It’s better to use a LNA (Low Noise Amplifier) with the following design.

Sans titre 3

Plume – 3 coils


Today, I have added 2 coils to the prototype receiver. What a beautiful circuit !

We will use it tomorrow to validate our software prototype. We will see if we are able to compute the location of the receiver and the range.

Plume – Amplifier


Today, I have worked with Marc-O on the amplifier for the receiver. IMG_1694[1]
We succeded in designing an inverting band pass filter. This filter is very selective and give use an amplification of 20dB at 20kHz. receiver

With the following response bode

Then, we gain an other 20dB by using the resonant frequency of the RLC circuit. bode2
As a result we have an amplifier of 40dB.
With 12mA in the coil, we measured a tension of  180mV at 30cm :).

And we can compare this result to what the amplifier of the Hydra should look likes. bode hydra