After it’s done uploading, you should see Arduino pin 13 blink in time with your heartbeat when you hold the
sensor on your fingertip. If you grip the sensor too hard, you will squeeze all the blood out of your fingertip and
there will be no signal! If you hold it too lightly, you will invite noise from movement and ambient light. Sweet
Spot pressure on the Pulse Sensor will give a nice clean signal. You may need to play around and try different
parts of your body and pressures. If you see an intermittent blink, or no blink, you might be a zombie or a robot.
To view the heartbeat waveform and check your heart rate, you can use the Processing sketch that we
made. Start up Processing on your computer and run the ‘PulseSensorAmped_Processing-xx’ sketch. This is
our data visualization software, and it looks like this.