The MAX30101 breakout is a sophisticated heart rate, oximeter, and smoke/particle sensor. Use it as a fun way to see your heartbeat, or to make LEDs or lights pulse in time with your heart. It's Raspberry Pi and Arduino compatible. nThis sensor has three LEDs u2014 green, red, and infra-red and photodetectors that can be used together to detect the amount of light reflected back to the sensor. A technique called photoplethysmography PPG can be used to detect the change in colour of your skin with each beat of your heart when the sensor is pressed against your fingertip. nYou can use the MAX30101 to detect particles in the air, like smoke, by measuring the amount of light bounced back to the sensor by the particles. They've got a rough example of how to do this in the Python library.n--MAX30101 - Heart Rate, Oximeter, Smoke Sensor n--Green, Red, and Infrared LEDs n--Photodetectors n--Ambient Light Rejection n--Temperature Sensor n--I2C Interface address 0x57 n-.