mark.o.s
mark.o.s
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Think the idea is that the capacitors at + and - will remove the DC component. Then if BiasOut is set to mid-supply and applied to both the inputs through a high impedance resistor, the EEG signals should be driven to the middle of the ADC voltage r…
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@biomurph Uploaded below! Thanks for the help
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@biomurphThank you for your answer. As for the differential cap not being shunted to ground, that seems to be the recommended configuration. It is explained in detail here by a TI employee on the TI forum. As for the 2 electrode configurati…
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Hello, I have come across this same problem. Is the equation below from the MCP3912 data sheet correct? The typical equation for conversion from ADC value to Volt is more like: Vout = ADC_value * (Vref / 2^(n-1)) I can not seem to g…
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Hi William, Thanks for that. You're right, so that negates my second point mostly. I still wonder, if only 1P and 1N are included in the bias, and they are only 3cm apart (roughly distance between C3-C4), then surely in addition to the offset, 5…
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I got some very pleasing results at the 1V range, extremely high correlation (>0.99). However, I had do a bit of tweaking first. Has it been noted yet that the Cyton's sampling rate isn't exactly 250Hz? I have a signal which is 7500 samples long…
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Just tried passing through some EEG with a max value of .5V and a min of -0.3V.Worked fine once the PGA is set to x1. When set to 24 it was clipping at 0.1875V (i.e 4.5/24) Thanks
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Thanks William.. So AVdd + 0.3 = 5.3 V My waveform generator is outputting EEG filtered between 0.5 and 90Hz with a max peak to peak amplitude of 1.2V by the way. In the previous thread, why do you say don't go higher than 1V? And also I'll be ta…
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Ya, it saves as a txt.file.When you open the GUI, and start System control panel. You will see the Data log file, etc. This is the name theat your data is saved under. It's a 13 column text file. First column is the sample number, columns 2-9 ar…