• Works with 3V and 5V Arduino
• Quickly and easily get reliable pulse readings
• No soldering required!
• Plug it straight into an Arduino or a Breadboard
• It can be hot-glued or epoxied to the back of the sensor to get reading from an ear lobePulse Sensor Amped is a plug-and-play heart-rate sensor for Arduino.
It can be used by students, artists, athletes, makers, and game & mobile developers who want to easily incorporate live heart-rate data into their projects.
It's quick and easy to get reliable pulse readings. Pulse Sensor Amped works with either a 3Volt and 5Volt Arduino.
When the Pulse Sensor Amped is just sitting there, not in contact with any fingers or earlobes or other parts, the analogue signal hovers around the mid-point of the voltage, or V/2. When Pulse Sensor Amped is in close contact with your fingertip or earlobe (or other part) the change in reflected light when blood pumps through your tissues makes the signal fluctuate around that reference point. In the image below the horizontal line is at V/2.
Arduino watches the analogue signal from Pulse Sensor, and decides a pulse is found when the signal rises above the mid-point. That's the moment when your capillary tissues gets slammed with a surge of fresh blood. Then, when the signal drops below the mid-point, Arduino sees this and gets ready to find the next pulse. There's also built in hysteresis to the rising and falling thresholds which you can adjust if necessary.