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BreathUp, good and bad news

Hi everyone!

During the end of the week, I knew lots of emotions. Indeed, Friday, after some tests with lots of noise, I was lost and I did not understand why there was that noise. So, I took the user guide of the tests board and I checked all the default parameters to know if the configuration of the software was wrong or not. After that, I debated with Alexandre to find the reason of this noise but we did not find. With Samuel and Alexis, we tried to watch an electrode signal on an oscilloscope but we watched a noise of 50 Hz too. Alexis or Samuel, I did not remember, tell me to put a square signal in input of the board. So, Saturday, I put a square wave on the board and I watch the wave but there was a noise of 50 Hz again. At that moment, I thought we did never find a solution for that noise.

However, with my team-mates, we met Laurent. He brought us the cable for the electrodes. And with it, he showed us how make an ECG measurement. Laurent said us that we could watch EGC’s picks on the signal. But there were lots of noise. During a debate with Laurent and Alexandre, Alexandre had the idea that the power supply of the board could generate the noise. Indeed, in the user guide, there was a topic which said a supply with stack could reduce the noise. That is why I went to the robotic club to ask them if they had a pin and a box for stacks. Thanks to Telecom Robotics, we could have a new supply with stacks. We also discovered if the computer, which make the acquisition, was in charge there are a 50 Hz noise too. After, that problem was resolved, with Alexandre, we make some tests to have a good ECG with all the electrodes. I assisted Alexandre to reduce the number of electrodes used to have an ECG.

My main task is still to have an EMG (electromyography) to valid the ADC. This EMG will be valided by Laurent.

As I have already told in an old post, today, we have a the PSSC for this task. So we does not respect it and we are in late. I hope to valid this PSSC in the next days.

Bye,

 Benoît

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