Pulse Oximeter using Arduino

Abstract

Pulse Oximeter is a noninvasive medical device used for measuring the oxygen saturation and pulse rate of a patient.The Pulse oximeter system is portable and provide remote and continuous health monitoring in case of adults.The system is also smaller, energy efficient ,user and cost friendly and also can be made communicative.It can also monitor blood oxygenation accurately in real-time.Oxygenation of the blood is important as many tissues and organs in the human body will become irreversibly damaged when not properly supplied with oxygen. This project involved the process to design a portable equipment that can be used to measure the oxygen percentage in blood and also to detect the heart rate of humans. This equipment will also display the measured parameters by using the LCD Display. The project is divided into three major parts which are circuit design, display circuit and programming part. In the circuit design part, the sensor, the signal conditioning, signal filtering circuits are built to realize the project. For the display circuit, Arduino Uno is the type of microcontroller that have been used as the interface between the overall circuit and LCD Display. The programming part is the important part because of their function to perform the operation and also will be responsible to display the result on the LCD Display. The programming code in the microcontroller will be stored to make the microcontroller function as the project needs to do the calculation by using the equation stored and send the result to be display by LCD Display. All the oscilloscope results are observed by varying the control signal frequency, changing the filters to obtain the SO2 value. The results obtained are not satisfactory. But an Arduino code is written to obtain the SO2 value by taking a two variable voltages as input to the Arduino. The paper presents a brief idea of the different components, their use in oximetry, how to improve the quality of PPG and some future implementations.