yj
yj
About
- Username
- yj
- Location
- France , Bordeaux
- Joined
- Visits
- 595
- Last Active
- Roles
- Member
- Location
- France , Bordeaux
- Interests
- Neurosciences
Comments
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Hello all, @wjcroft : the "SD card Only" present on github, has been writen by Joel. It has been for me a starting point from which I increased the sample rate and I suppressed overruns. @Rogerio : Most operations on the OBCI Card , are cont…
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Yes @biomurph, the Host on the Dongle and it works very well when I choose the channel of another one of our 3 new Cards... A last symptome : If I try to upload the firmware of the Card, as I use to do, the blue diode whick blinks slowly after the…
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@biomurph , @wjcroft , "One train may hide another" and a problem , another... I Uploaded the Host Firmware to the Dongle following the instructions: 32 bits Host... device_t role = HOST ; RFduinoGZL…
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Ah!!! Sorry David , I thought you wanted to not to use a booster... This graph is the typical way the voltage of a 1000mAh Lipo, decreases with the capacity used. At 80% (800mAh used) any lipo shows this "cutoff" as you say. Yannick.
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You make me doubt, David,on http://docs.openbci.com/hardware/01-OpenBCI_Hardware#openbci-hardware-documentation-openbci-32bit-board-openbci-32bit-board-circuit-schematic the +3V regulator outputs 3.3V. 3.7V is the voltage at the end of the dis…
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Hello David, I asked myself the very similar question... Theoreticaly Yes. From the LP5907 data sheet : 7.4.2 Minimum Operating Input Voltage (VIN) ... The output voltage is not regulated until VIN has reached at least the greater of 2.2…
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Have you choosen te rigth Card in "tools/Cards" menu ?
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@biomurph , @wjcroft , Following your recommandation I finally compiled the Dongle code... My problem was that I forgot to choose in "Tools/Board" Rfduino , causing to appear the error message : OpenBCI_32bit_Host.ino:35:53: fatal error: …
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@biomurph, yesteday, using windows 7 I remarked that the "+" are no longer needed ! ! ! Thus the ++ problem that I observed under XP, would not be caused by the Dongle itself ? Have you ever heard of a such incompatibility? Yannick.
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Thank's @biomurph, My english is bad..., I just wanted to know if the two versions , 1.5.8 and 1.6.5 can be installed on the same computer ? & sorry again... Yannick.
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Thank's @biomurph, Then can it coexiste with the 1.6.5 that I curently use? Yannick.
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@biomurph I am trying to re-program the Dongle. But : OpenBCI_32bit_Host.ino:35:53: fatal error: RFduinoGZLL.h: No such file or directory Do I absolutely need to use the 1.5.8 ide ? If yes can it coexiste with the 1.6.5 that I curently use? …
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@biomurph Good news, what has been your motivation ? - Overruns ellimination? - Sample rate increase? - Background task? - ... ? In any case , a big thank !!! Yannick.
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@biomurph you asked me if I had altered the dongle firmware... Do you mean that someting could be wrong with this dongle? What should I do? Is there anything to check? How? Is there a way to know which version is running? Thank's Yannick.
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@ntlanh Do not worry Anh, 8 times faster and shorter @ 2kHz, is well related to "the speed of writing the data from the Board to the SD card." Yannick.
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@wjcroft & @ntlanh, & ... yes interrupts is the best approach. I hesitated to use them because I was afraid to break some time dependent processes during SD card writing... For exemple is it possible to interrupt and release the SPI bus d…
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@ntlanh, no, no. 5 minutes corresponds to 11.000 blocks at 250 Hz. That should do 37.5" at 2k Hz. at 2k Hz it is 8 time faster and shorter. to acquire these 11.000 blocks A block = 512 octe, in the 5mn_file you should find about : 5x60x250…
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@ntlanh, To write one-second data , at 250Hz or 2kHz , it takes one second. (Joke). When you choose to record at 250Hz for 5 minutes you record 11000 blocks... at 2k of coarse it will take about 5'/8 or 300 secondes / 8 ... to get these 11000 …
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@ntlanh, I sent you a dropbox link. Tell me if you can use it... Yannick.
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hello Ntlanh, @ntland, 1) the files that you receive by bluetooth or from the SD card ? 2) On the SD card the Footer is written in the last block of 512 octes, which is filled with zeros. 3) When you choose a "record duration" in fact the soft…
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@AgustinS I , for my part , fully agree with your interpretation of the Sandwich protocole and its timing. On the net the best I found was : Yannick.
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@biomurph Thank's for your answer, - I have not touched the Dongle firmware. - In the file OpenBCI_32bit_SD_Only.ino After the main loop we find : // =============== some variables to help find 'burger protocol' commands int plusCounter = 0; …
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Hello all, @biomurph, "The Dongle inserts the '+' sign into the signal. You, or the controlling program, does not have to do it." It seams logic but I cannot get any reaction of the programme if I dont write all the "+". From the Arduino IDE, wh…
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A last modif : The SD only version of Biomurph uses the code "N" to start running. In the file "OpenBCI_32_SD_Only.ino" you will find a case 'N' : In this case I added the initialisation of write and read indexs. case 'N': writeTo…
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@wcroft Thank's William, but "it is too early to crow victory"... To do what I want this code works but since it depends on the context and the type of SD Card, it should be tested carefully... For exemple I am not sure that 16 Channels / 2kHz…
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//============================================================================================================ // In File SD_Card_Stuff.ino ***** Call to overloaded writedata function in order to call OBCI.push() during SD busy state *****…
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Hello, @wjcroft, Thank's again William, again I missed the link to the comments, for my defense recognize that this link is rather discreet... I am impatient to know the details which will appear in the FAQ. Yannick.
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Hello, @wjcroft Thank you William, I missed the first link... The aim of the second link is not related to the problem raised by the very long "busy state" of the SD interface... ( @hitheshaum : have you tested it recording on a SD card? (Since …
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Concerning the overruns, I did some statistics ; on the following figure on X axis the acquired sample number, on Y axis the number of samples losted during overruns. The session duration was 130' and the sample rate 500Hz on 8 channels. There is …
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Yes in this card it's the war for the "SPI". I wonder if this achitecture has been kept in the new card called "Ganglion". Will you clone it? Any way even if we have a dedicated spi for the sd card, even if we use interrupts instead polling, (it wo…