Hi Brian, Thank you again, you are really a good helper. But I still have lots of problems. The hyperlink which you give me only give me the information about lead-off. And I still can't understand why I need lead-off to monitor my device. The most important thing is I want I can get the clear EEG signals. But my result is so terrible, as the follow. I have get the test signal successfully. So I can make sure my chip can work normally. The Image 1. is under the situation which I only set channel 1 to 3 as normal, and the others are power-down. But I get lots of noise even I didn't touch it, and there is also no reactions when I touch the electrode from channel 1 to 3. The others channels I think they must be 0 voltage or just very small voltage but we can see the value still huge from the Image 1. There are the registers setting: device.write(0x11); //SDATAC wait(4*tclk); device.write(0x41); //from 01h to 0Eh. device.write(0x0D); // total 14-1 registers. device.write(0xD2); // configure 1. device.write(0xD0); // configure 2. device.write(0xEC); // configure 3. device.write(0x00); device.write(0x00); // channel 1 device.write(0x00); device.write(0x00); device.write(0x80); device.write(0x80); device.write(0x80); device.write(0x80); device.write(0x80); // channel 8 device.write(0x00); // BIAS_SENSP (we need all to be 1.) device.write(0x00); // BIAS_SENSP (we need all to be 1.) device.write(0x4F); // 15h. device.write(0x00); // Only MISC1. device.write(0x20); // MISC1. device.write(0x10); //RDATAC Image 2. is about how I connect the device. Blue one is connect to my ear as bias reference. Orange and yellow is connect to my brain channel (I just user my hand to touch it , not really connect on my brain) . I really so stupid at this field. If there are any wrong, please help me. Thank you. You are so kind. Kindle Hsieh Image 1. Image 2.
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