# Arduino ECG sputtering out totally random values

I have encountered a problem in my ECG/EKG design.

I am trying to make an ECG using an Arduino as a microcontroller to send/retrieve heart rate measurements via Bluetooth (JY-MCU.)

I know my circuit is working because when I place an LED in op-amp output and its ground, I get a slight dimming of the light if I gently put my hand on the leads. I know the issue is with my code. I have been working on this project for a while and still can't find a solution.

Here is my schematic:

Here is my code that I think is incorrect. The code is just the bare minimum.

// External variables
const int  signal = 8;    // Pin connected to the filtered signal from the circuit
unsigned long time;
unsigned long frequency;
char freq[3];

// Internal variables
double period = 2000;
double starttime = 2000;
double input = 0;
double lastinput = 0;
unsigned long death = 0;

// initialize the library with the numbers of the interface pins

void setup() {
pinMode(signal, INPUT);
Serial.begin(9600);
}

void loop() {
delay(500);

time = millis();

period = time - starttime; // Compute the time between the previous beat and the one that has just been detected
starttime = time; // Define the new time reference for the next period computing
death = time;
frequency = 60000/period;
freq[0] = frequency/100+48; // Sort the hundreds character and convert it in ASCII
freq[1] = (frequency/10)%10+48; // Sort the thents character and convert it in ASCII
freq[2] = frequency%10+48; // Sort the units character and convert it in ASCII
Serial.println(freq);
}


All I'm getting is either 120 or 119 as my value. It fluctuates between those two. I tried changing my resistors out but that didn't do anything. I also completely took the wire between pin 8 and the breadboard out, and it still fluctuated between 119 to 120. I don't have any idea what is going on here! I would appreciate it if someone could help me out here.