ECG Graph is not coming proper

[laila_ayesha]

I am trying to generate proper ECG graphs using ESP32 with 30 pins and AD8232 heart rate monitor. After several attempts, I am failing to get proper ECG graphs. Can't figure out what is going wrong here. Are the ecg electrodes placed wrong or what is happening? Can anyone kindly help? I have a deadline to meet. Attaching my graph screenshot.

[Railroader]

I don't manage to magnify the X scale. Never mind. The signal doesn't look lika an electrocardiogram at all. It looks like a sina curve likely picked up from mains.

I suggest You post the schematics and also try google on "Arduino + ECG". There are several projects like Yours.

[johnwasser]

Are you following a tutorial?

[cncnotes]

Could you please post your code in code tags, and a diagram of your actual hook-up of the components to the ESP

[pmagowan]

An ECG is a graphical representation of the electrical activity of the heart and requires at least 2 points on the body. A standard ECG uses 12 leads. Normally the signal is filtered as electrical activity in other muscles can cause artefact. Your trace does not look like the subject is still alive

[laila_ayesha]

Thank you so much for your reply. Here is my circuit diagram. I am new to this. So any suggestions would be really helpful.

[laila_ayesha]

Yes I am following some. But those are a little different

[laila_ayesha]

Thank you so much for your feedback. I am trying to get it right.

[laila_ayesha]

My code:

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(14) == 1)||(digitalRead(12) == 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);
}

[pmagowan]

Edit code into code tags <|>. Give description of how you obtained trace. Your circuit diagram is incomplete and would not create any output

[laila_ayesha]

I am connecting the ESP32 with micro-usb port with the laptop for powering. Not much sure what you mean.

[pmagowan]

A human presumably is in the circuit

[laila_ayesha]

Yes I am using the 3 lead ecg electrodes on me. How do I possibly show that in the diagram?

[pmagowan]

Fritzing are poor but I would add a lead with a label on a schematic stating electrode for right wrist etc

[laila_ayesha]

Okay. I would do that. Thank you for your feedback. Apart from that, are the connections okay?

[johnerrington]

How to make a schematic you can post.

When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

Link to the sensor
https://learn.sparkfun.com/tutorials/ad8232-heart-rate-monitor-hookup-guide/all

@laila_ayesha

using ESP32 with 30 pins

There are countless ESP32 boards - do you know which one you have? (hint - give a link)

Generally the pin marked VP is analog input ADC1 ch 0 on GPIO36

There is a good tutorial here on reading an analog voltage with the ESP32

ESP32 Analog Input with Arduino IDE | Random Nerd Tutorials

I'd suggest you connect a pot as shown and try it. You could use GPIO36 instead of GPIO34 as the tutorial uses.

[laila_ayesha]

Thank you for your post. It was very helpful.