How to get the ECG signal to use ads1298 ?

JOONGHOON LEE

Other Parts Discussed in Thread: ADS1298

Hi guys

I have some questions abut ads1298

I got this signal to use oscilooscope. The red one is MOSI and the blue one is MISO siganl. I wrote AVR code to make MOSI.

But the wrong signal is blue one. The blue vertical line is continuously shifted right to left. I dont know why the lots of line signals are shifted.

Two of pictures are same signal but the scale is just different. I want to get the hold signal like red one.

How can I fix it?? plz advise me.

And I just want to get the CH1-CH3 data not all channels. Can I do this?? Advise me plz.

Thanks guys

over 12 years ago

0 Tony Calabria over 12 years ago

TI__Mastermind 43915 points

Hi Joonghoon,

Could you double check your setup. It looks like you are showing /DRDY (blue) and SCLK (red) based on the signal behavior. If you are running those into MISO and MOSI you are going to be having problems.

Regards,

Tony Calabria

0 JOONGHOON LEE over 12 years ago in reply to Tony Calabria

Prodigy 30 points

Hi Tony

Thanks for your comment. :)

I almost get the signal. But I dont know how can I select the channels.

I just want to get the Ch2-3 signals. How can I code the program? Do I need to change the registers such as CHnSET??

Regards,

Joonghoon

0 Greg Hupp over 12 years ago in reply to JOONGHOON LEE

TI__Mastermind 23235 points

Mr Lee -

To get the data from channels 2-3 you would need to read the data through channel 3 (read status, ch1, ch2, ch3). After channel 3, you can stop reading the data until the next DRDY signal, when you would repeat the process. Of course, you can disregard ch1 if you are not interested in it.

Data converters

Data converters forum

How to get the ECG signal to use ads1298 ?