How to send the ECG signal to the arduino UNO?

I have the ECG working right now from the amplifiers and the notch filter, and I have to program the arduino to get the signal and show it on the serial plotter, but it's so confusing. DO you guys have any examples I can use to do it? everything I have seen is by using the sensor, but I do not use that one.

Thanks in advance.

This is the signal I’m getting from the oscilloscope that I want to put on the Arduino serial plotter.

I’m actually just looking to get the BPM of the heart, but I want to see how to get it on my serial plotter.

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Thanks to all those who helped and added to this list.
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I have read it and made the proper changes. I don't know what's wrong with my post but thanks for sending it agin.

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What, precisely, is generating the waveform (and don't say a human heart...)

It's possible you could just connect the point you're scoping to the A0 analog input of an Uno and run something like:

const uint8_t pinECG = A0;

void setup() 
{
    //don't need to declare A0 as input (default)
    Serial.begin( 115200 );
    
}//setup

void loop() 
{
    uint16_t ecg = analogRead( pinECG );
    float volt = (float)ecg * 5.0 / 1024;
    Serial.println( volt );
    
}//loop

I’m reading the frequency of the heart beat. I’ll try that and let you know.

Question: why 1156 and not 9600?

By "1156" are you referring to the serial baud rate? If so: Why not use 115200 or faster?

At 9600bps it takes a millisecond to send one byte over serial.

At 115200, that same byte takes ~87 microseconds. The less time spent doing something like waiting for serial bytes to be sent means more frequent sampling of your input signal.