ADS1299 with Arduino DUE Sampling problem

vibodhavibodha
in Other Platforms

I have EEG Front-End Performance Demonstration Kit and got clear idea bout the operation of the chip. 

Then I decided to use ADS1299EEG-FE Daughter Card separately with Arduino DUE.

Then I made all the necessary connections(SPI , Reset, Start, DRDY) between Daughter Card and Arduino. The required power (3.3V and 5V , GND) are supplied from Arduino board.

When I run the program it shows the default register values correctly as follows. That implies the chip powered up correctly 

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Then I Modified CONFIG3, CONFIG1, CH1SET   registers to apply TEST signal to CH1 and take 250 samples.

But the problem is I don’t observe the correct Square wave form from the channel.

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The waveform is in this graphs but there are un expected peak values (errors) ..

Sometimes the graph shows almost correct with small level of error values as follows

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Please help me to correct this. I think I’m almost done but stuck at this point. :(


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