inverted input from AD8232 ECG monitor

hadwll
Posts: 1
Joined: Tue Jan 24, 2023 7:02 pm

inverted input from AD8232 ECG monitor

Postby hadwll » Tue Jan 24, 2023 7:13 pm

I am developing a project that uses the ESP32 board (devkit3) and the sparkfun AD8232 ECG board. I am using an ecg simulator.

Is there a reason why the QRS wave is looking to be inverted? I have noticed that some other people online have posted ECG results from the same setup but they also look incorrect!

This is an image of my output from arduino serial plotter
ecg1.png
ecg1.png (46.07 KiB) Viewed 800 times
here is an example from github issues post
ecg2.png
ecg2.png (86.26 KiB) Viewed 800 times
here is an example of what it should look like from an arduino board.
ecg3.PNG
ecg3.PNG (79.17 KiB) Viewed 800 times
the code is as below

Code: Select all

void setup() 
{
// initialize the serial communication:
Serial.begin(9600);
pinMode(14, INPUT); // Setup for leads off detection LO +
pinMode(12, INPUT); // Setup for leads off detection LO -
 
}
 
void loop() {
 
if((digitalRead(10) == 1)||(digitalRead(11) == 1)){
Serial.println('!');
}
else{
// send the value of analog input 0:
Serial.println(analogRead(A0));
}
//Wait for a bit to keep serial data from saturating
delay(1);
}

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