alwayswearshats
alwayswearshats
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Hello, this project was time consuming but also fun. If you have the means and are interested in experimentation, I would recommend it. I had the PCBs manufactured in China from JLCPBC and purchased all of electrodes online from Florida Research …
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Hello, I managed to build a DIY cyton and headset using the WiFi Shield without the RFDuino as it is obsolete. See my post towards the end of the thread at the link below. https://openbci.com/forum/index.php?p=/discussion/1773/is-cyton-programming-…
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Part of the benefit of DIY is learning how to DIY. There is enough information on this forum and online to make your way through. It will take time but you can do it. Unfortunately, putting a tutorial together would take too much bandwidth that I…
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They were definitely not a smooth fit at the start. Playing around with the scaling and working-in the rough edges of the grooves a few times worked fine for my purposes. By wire crimp nuts, are you asking about the contacts for the spikey/flat e…
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I built the Mark IV with Cyton (no dongle) and WiFi Shield from scratch (PCBs and headset). PCBs manufactured by JLCPCB. Two types of springs off eBay: https://www.ebay.ca/itm/0-8mm-Wire-Diameter-304-Stainless-Steel-Compression-Spring-Pressure-…
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Hi William, it has been a while since I reviewed this, but my recommendation remains to remove C4 (100uF ceramic) and replace it with a >300uF electrolytic capacitor. I would not recommend ultra low ESR capacitors as that is very likely why C4 wa…
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Hi @drivas, are you using the WiFi Shield or RF dongle?
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[Jason, I just edited your above post to insert your requested text edit. Thanks.] Edit above: "From the frequency response traces, you can see that the 100uF ceramic (C4) causes oscillations while the electrolytics (or no electrolytic) caused…
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Here is an update regarding the WiFi Shield AP2112 3.3V supply output capacitor debug. After thorough stability testing, I have identified the source of the 8 kHz to 20 kHz ringing is the 100uF ceramic capacitor 'C4'. Removing this capacitor allev…
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Hi William, I just tried the 4.1.2 beta GUI release for OS X and UDP/UPDx3 still don't work for my WiFi Shield with Cyton.
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Also, I spent some time today trying to better characterize the WiFi Shield 3.3V supply stability. I took a spare PCB and just soldered the power supply components (bypassing the switch). I used an electronic load to draw ~300 mA at 10 Hz via functi…
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Hi William, I was using a fixed scale in Time Series. To be honest, I was not really paying much attention to the amplitudes of the spikes when at +20.5 dB and +5.0 dB - just if they were present or not.
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Hi William, hopefully I can address your questions. 1) When I connect to my WiFi Shield using WiFi Direct (TCP), I do not drop packets (20 minutes is longest I've checked, though). I actually had to walk about 25 ft (+20.5 dBm setting) with my la…
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Hi William, I tried a few things that you had suggested and tinkered around a bit. Apologies for the rambling essay in advance... ELECTROLYTIC CAPACITOR ACROSS ESP8266 SUPPLY I ended up soldering a 330uF across 3.3V and GND on the top side of …
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Hi William, thank you for the suggestions. I am going to be out of town for the weekend. I will give some of your suggestions a try when I return. Cheers
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Hi William, thank you for your reply. Yes, this is a DIY, and it is possible that these PCBs aren't of the best quality (JLCPCB). The WiFi shield did not have too many components and the smallest were 0603 which weren't too bad to solder under a m…
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Hi William, Yes, it seems that this setup is working as expected. I was just curious if there was a reason for choosing these settings as it appears to go against the datasheet. Thanks
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Fixed. Needed to properly reflow the solder for the device.
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Are you using a Wifi Shield or the RFDuino dongle? Wondering if this might have to do with the intermittent noise bursts observed when using the Wifi shield. https://github.com/OpenBCI/OpenBCI_GUI/issues/231
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Interesting, not sure why I never noticed that folder before. It looks like this is where my "missing" files from the standalone OpenBCI GUI have been all along. Thanks!
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Hi @retiutut, On my OS X, there is no SavedData folder in the standalone OpenBCI_GUI (4.0.3) package contents. On the other hand, when running OpenBCI Hub (2.0.7) with Processing, I am able to see a SavedData folder and data files show up as e…
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So it seems that I am able to save and locate recording data when I use the OpenBCI GUI via Processing but not standalone.
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Hm, that's odd. The input of the TPS72325 should be -3.3V not +3.3V. Is it possible that you soldered the voltage inverter (U3, LM2664) the wrong way around?
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Hi JB, I recently built my own Cyton with WiFi Shield without the RFDuino ICs. See my post here: https://openbci.com/forum/index.php?p=/discussion/1773/is-cyton-programming-possible-without-using-bluetooth-dongle#latest
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With help from @Haseeb, I was able to get my Cyton and WiFi Shield DIY boards up and running without the RFDuino ICs. This is the procedure that worked for me (running OS X 10.13.6) : * Soldered components and connectors to WiFi Shield and Cyton…
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OK - thank you!