Heartbeat Detector Module
This module contains a bright infrared LED and a phototransistor. When you place your finger between the LED and phototransistor, the blood in your finger blocks some of the infrared light hitting the sensor, causing a slight change in the current through the phototransistor.
This current, when amplified and converted to a digital signal by a microcontroller, can be used to detect a human pulse.
- It's important to shield other light sources from the phototransistor, otherwise the signal-to-noise ratio will be very low and a pulse may not be detected.
- Making a working heartbeat detector from this module may be challenging so we would recommend only customers with good microcontroller and analog circuitry skills to purchase this product.