AD8232 two electrode mode

Sensors Biometrics
1

Hello dear community,

as I purchased the AD8232 Heart Rate Monitor sensor and I am a newbie, I would like to know, how can I use the two electrode mode with this particular sensor. What steps do I have to follow. I have read in the datashet the following sections “Right Leg Drive Amplifier”, “AC Leads Off Detection” and “Heart Rate Measurement Next to the Heart” , but I could not understand the setup for this two electrode mode. For example: Do I have to add a 10Mohm resistor? Do I have to short the 1nF capacitor from RLD to RLDFB?

I know these question sound annoying but I would really appreciate your experience on this topic.

Thank you very much in advance

Have a nice day

Best regards

Kosta

2

As far as I know, the AD8232 Heart Rate Monitor sensor by sparkfun is designed for 3 electrode operation only. The AD8232 IC may support otherwise, but the sensor module made by sparkfun is for 3-electrodes only. However, let’s see if anyone else have a clue.

3

Hello rpiloverbd,

I think that the AD8232 Heart Rate Monitor is capable of performing a 2 electrode measurement. I got it from the AD8232 Heart Rate Monitor datasheet(https://www.sparkfun.com/products/12650), so I think it can work like the aforementioned method. Maybe by connecting electrodes only at RA and LA? I have found additional information in this link (https://electronics.stackexchange.com/q … rld-ad8232) to shorten the 1nF capacitor between RLD and RLDFB. Additionally, I found a project where the students work with the two lead-mode (https://web.wpi.edu/Pubs/E-project/Avai … Walker.pdf).

I hope that someone can help me further with this issue

Thank you very much for your time and help

Best regards

Kosta

4

Does anyone from the forum have any idea how to activate the “two electrode mode”? Maybe one of the techhnical support of SparkFun?

Thank you very much in advance

Best regards

Kosta

5

It doesn’t look like the sparkfun board is configured for 2 lead operation, but you might be able to modify the board to work as 2 lead though. Don’t know if sparkfun has tested that so they may not be able to offer any advice.