deboragalloway
deboragalloway
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Thanks everyone for your input. I've been so busy helping my elderly father care for my Mom and making sure my father has what he needs, that I haven't had time to look through all the links yet. I will definitely do so over the next few days, and…
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Chip, its great to hear that you have measured impedance. Measuring frequency of 31Hz is not good because it is in range of the EEG signal spectrum. You must increase this frequency to Fs/4. In real EEG measurements you will have a error when mea…
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I forgot to say in previous post, EEG input stage can be designed with LC components instead of RC components. Inductors have near zero impedance at 125Hz, so code that James presented to us will give the great results. K
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Hi all, first I would like to say to James that he done a great job, bu implementing impedance measurement. James, according to your schematic, you have internal serial resistors of 10Kohm on every input. The big problem is that real electrode-sk…
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Hi Chip, I'm using Bluegiga WT12 Bluetooth module. Baudrate between MCU and Bluetooth module is 921600b/s. I'm using SPP prifile, so max baudrate in the air can 500kb/s. For this application you must use handshaking and ring buffer. K
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Chip, when using sample rate of the 250Hz, you cannot implement good impedance measurement. This sample rate is too low for EEG. What about person who have epileptic disease? EEG of the epileptic person is above 60Hz (70-90Hz). If you sample with…
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Hi guys, I will write you now a little letter about impedance measurement of the electrode-skin interface in EEG measurements. First I would like to say biomurph something about impedance measurement. You cannot measure impedance by using DC cur…