KY-039 Datasheet | Joy-IT

description 1 3 Pinout 5 4 Code example Arduino 5 5 Code example Raspberry Pi 7 Picture Technical data / Short description While sticking a finger between the infrared diode and the photo transistor you can detect the pulse at the signal out. The explanation of the functionality of a photo transistor is simple: It works like a normal transistor - you will detect a higher electricity if the control voltage is higher. Instead of the control voltage, the photo transistor uses the light. If it it's a stronger light, you will measure a higher electricity. Export: 16.06.2017 Copyright by Joy-IT - Published under CC BY-NC-SA 3.0 Page 179 of 214 KY-039 Heartbeat sensor module   If you switch a resistor and a transistor in row, you will see a special behavior if you measure the voltage at the transistor: if much light shines at the transistor, you will measure a very low voltage (near 0V). If the transistor stays in the dark, you will measure a voltage near +V. With this sensor module, which contains a phototransistor and an infrared diode, you can measure a pulse. For that, you have to put a finger between the diode and the transistor. Explaination: exactly like you know it from a flashlight, the light can shine through your skin. If you hit a vein with the light, you can see the pumping of the blood a little bit. You can see it because the blood concentration is different on different areas in the vein, which means you can...