KY039 heart pulse sensor

The heartbeat measuring module on the finger uses a bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, generating a flicker of a small LED that turns on with each pulse of blood pressure. This pulse monitor works as follows: The LED is located on the side of the finger, and the phototransistor on the other side of the finger, as you can see in the image and the phototransistor used, the flow of light emitted that passes the finger can get the pulse cardiac.

When the pulse of blood pressure passes through the finger, the current at the base of the phototransistor changes slightly, because the amount of light that the finger can go through decreases, which means an exit through the different analogous port.

Main features:

• Model: KY-039
• Voltage: 3.3 to 5V DC
• Output: Analog
• "S" sensor pin connected to pin Arduino Analog 0 / A0
• Sensor + (center pin) connects to Arduino pin 5+
• Sensor Pin: Connect to Arduino GND pin
• Weight: 4 gr
• Dimensions: 25 x 12 x 12 mm