The function of the RGB sensor is to identify colors. The sensor does this using an array of 64 photodiodes. There are four groups of photodiodes; each group has a filter over it making it sensitive to a different color of light (white, red, blue, or green). The sensor unit analyzes each photodiode one color at a time and measures the intensity of the light that passes through it. If a red object is being sensed, the photodiodes beneath the red filters will sense higher light intensity values than the other filter colors. The photodiode senses the intensity of the light and outputs this intensity data in the form of a current. For example, if the photodiode senses high light intensity it outputs a high current, and if the photodiode senses low light intensity it outputs a low current. The color sensor module contains an internal current-to-frequency converter that converts current readings from photodiodes into a square wave whose frequency is proportional to the intensity of the sensed color. The light intensity values of each color (which have now been converted into a frequency) are averaged and turned into an RGB value. By measuring the relative level of red, green and blue light, the color of the object is determined. Since we know that the red component of the RGB value will be high and the blue and green components will be low when red is sensed, we can specify the range for each RGB component associated with a certain color in the code. RGB values detected by the color sensor module are monitored in real time. When the criteria for “red” is met, and blood is detected, the code signals for an alarm to sound, which wakes up the patient.