ADS1298R: ADS1298R

Hello,

I'm working on ADS1298ECG_kit to collect respiration data by connecting electrodes to the subject. the jumper connection made for this is JP36, JP34 and JP35 (2-3) respectively. I'm unable to get the waveform as mentioned  in the datasheet. I'm attaching the GUI configuration image and output waveform graph, please see to that and guide me where i have done mistake.

thank you,

abhiranjini

Hi Abhiranjini,

Before we worry about the respiration signal, are you able to read a known signal such as a sine wave from a signal generator? 

Are you wanting to use a internal or external reference voltage?

hello,

Can you please suggest what voltage range we have to set in signal generator and also suggest the lead connection scenario to signal generator.

we are using internal reference voltage.

thank you,

abhiranjini

hello,

can we use simulator directly with 20 respiration rate instead of signal generator?

and if we have to using signal generator , then suggest what should be the frequency range given for RA and LA.

thank you,

Abhiranjini 

Hi Abhiranjini,

That would be fine. Measure the output from the signal generator, measure the input directly at the pins, then see what the data output looks like. This should help narrow down where the issue is. 

hello,

we have tested for sine wave as per your suggestion(300mv, <20Hz). the waveform acquired is posted below.

thank you.

Hi Abhiranjini,

For the above picture, was your reference buffer enabled? If not, please enable the reference buffer and try again. 

Is this on channel 1 and was the respiration enabled? If yes, please disable the respiration feature and try again. 

hello,

The reference  buffer is enabled.

we are not getting any data from channel 1 in respiration disabled mode. i have attached the screenshot of that.

thank you.

Hi Abhiranjini,

You are not able to see any signal when a sine wave is applied to ch1? Are you able to read the internal test signal? 

Do you have another board you can try? Perhaps this one has been damaged. 

Please use the BIOFAQ to confirm that your ADS1298R device is still functional and let me know the results. 

hello,

yes I'm not able to see any signal when a sine wave is applied to ch1. I'm able to read the internal respiration data.

we don't have any other board.

we have our own target board which we have developed using AS1298R, even in that we are acquiring all channel data except this CH1.

In ch1 we are getting ECG(V6) but not respiration data.

thank you.  

hello,

can you please suggest us something else which we can try to get respiration data.

thank you

hello,

we have performed the test given in the below link

https://e2e.ti.com/support/data-converters/f/73/p/775288/2868597#2868597

the board is working fine and tested voltage value across capacitor is given below.

please let us know if any other test need to be done.

thank you.

Hi Abhiranjini,

That's great news! It looks like the device is still functional. 

Are you able to make it through the rest of the checklist? #3-10. 

https://e2e.ti.com/support/data-converters/f/73/p/775288/2868597#2868597

hello sir,

Yes we have done all those which is their from 3-10 

thank you

You are able to read from a known input signal correctly? 

On the previous posts you were not able to do this. What did you change that allowed you to do this successfully? 

10. Attempt to read data from a known input signal to confirm correct communication and code to voltage conversion.

hello,

I'm able to read  the ECG data which is given through simulator.

thank you.

hello,

can you please tell any other way in which we can acquire respiration data.

we are able to collect ECG data in all channels

thank you.

hello,

can i expect any reply for my post.

thank you.

hello,

we have already done this and we are getting the waveform as shown in the fig.38. internal respiration is working fine. if we are giving externally from simulator that is not happening, so can u please suggest on that.

thank you.

Hi,

Resulting waveform after doing the connection suggested by you.

thank you.

hello,

we are using fluke ProSim 4 simulator, can you please tell me what issue may be their in simulator.

thank you.

hello,

can you please suggest any hardware change if possible , because we have already tested the simulator and it is working fine .

thank you.

hello,

we have done the jumper setting as you have mentioned and the lead I is set to LA. the waveform got from the setting is shown bellow.

thank you.

hello,

that is actually 19sec data so we have to get 4 to 6 respiration peak, but we are not getting. by zooming in also we are not getting.

thank you.

hello sir,

I'm attaching the zoomed image were 1st one is for 2000 samples(8sec since sampling frequency is 250) and 2nd image is for 1000 samples(4sec since sampling frequency is 250).

can you please see to the waveform and suggest what should be done next.