Heartbeat Simulator May 2026

# QRS complex model (sum of Gaussians) def qrs(t_center, t): return 1.2 * np.exp(-((t - t_center)**2) / (0.01))

// Predefined waveform: sequence of amplitudes (0-255) // Represents P-QRS-T complex byte ecgWaveform[] = 128, 128, 130, 135, 140, // P wave start 150, 155, 160, 165, 170, 175, 180, // P wave peak 170, 160, 145, 130, 120, 110, // P-R segment 100, 90, 80, 70, 60, 50, 40, // QRS onset 30, 20, 10, 5, 0, 0, 0, // R wave downslope 10, 30, 50, 80, 110, 140, // S wave and return 160, 170, 175, 170, 160, 150, // ST segment 145, 140, 138, 135, 133, 130, 128 // T wave and baseline ; heartbeat simulator

beat_interval = 60 / bpm for i in range(int(duration / beat_interval)): center = i * beat_interval + 0.2 # offset to place QRS ecg += qrs(center, t) ecg += p_wave(center - 0.15, t) ecg += t_wave(center + 0.3, t) # QRS complex model (sum of Gaussians) def

// Pause for rest of beat interval int waveformDuration = sizeof(ecgWaveform) * 10; // in ms int remainingTime = beatInterval - waveformDuration; if (remainingTime > 0) analogWrite(9, 128); // baseline delay(remainingTime); // P wave start 150

void setup() pinMode(9, OUTPUT);