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This is an Arduino RGB Color Sensor uses RGB sensor chip and 4 white LEDs.TCS3200 color sensor can detect and measure a nearly limitless range of visible colors red, green & blue.
MAX30100 is an integrated pulse oximeter and heart-rate monitor sensor solution. It’s an optical sensor that derives its readings from emitting two wavelengths of light from two LEDs.
Ultrasonic Sonar Sensor HC-SR04 uses to determine the distance to an object.This sensor reads from 2cm to 400cm with an accuracy of 0.3cm,which is good for most hobbyist projects.