Working of MAX30100 Pulse Oximeter and Heart Rate Sensor.
The device has two LED’s, one emitting red light, another emitting infrared light. For pulse rate, only the infrared light is needed. Both the red light and infrared light is used to measure oxygen levels in the blood. When the heart pumps blood, there is an increase in oxygenated blood as a result of having more blood. As the heart relaxes, the volume of oxygenated blood also decreases. By knowing the time between the increase and decrease of oxygenated blood, the pulse rate is determined. It turns out, oxygenated blood absorbs more infrared light and passes more red light while deoxygenated blood absorbs red light and passes more infrared light. This is the main function of the MAX30100: it reads the absorption levels for both light sources and stored them in a buffer that can be read via I2C. AX30100 and OLED Display works on I2C communication protocol. So, its SDA and SCL pin is connected to I2C pin of Arduino, i.e. A4 and A5, similarly Bluetooth module is an UART module and need to be connected to Tx and Rx pins for Arduino.

The IoT Enabled Pulse Oximeter developed has been a relative success compared to mainstream Pulse Oximetry and Pulse-Rate devices. Thus, our aim to make the system accessible and portable. With the connection with the Internet, even remote doctors can assess the condition of the person by checking the result from the web. Hence, the device has proved to be fruitful despite its challenge. The outcome of this project is provide a continuous monitoring of health and an open platform for patients to get to know their health using IoT (IBM). As discussed earlier, various health parameters are identified to determine a patient’s health condition.

The main advantage is that it will greatly reduce hospitalization. The system is cheaper due to home monitoring of patients at home as compared to the expensive workplaces. The results from designed system are quite impressive as compared to those standard commercially available systems. However, accuracy could be improved by using high quality sensor IC with much better S/N ratio and better peak detection algorithm. The system can also be designed to alert a person for indication of some abnormalities. The person who has no technical knowledge can also operate this device.

Claims:

1. The absorption levels for both light sources and stored them in a buffer that can be read via I2C. AX30100
2. OLED Display works on I2C communication protocol. So, its SDA and SCL pin is connected to I2C pin of Arduino, i.e. A4 and A5.
3. Bluetooth module is an UART module and need to be connected to Tx and Rx pins for Arduino.
4. The system is cheaper due to home monitoring of patients at home as compared to the expensive workplaces
5. The sensor is an integrated pulse oximetry and heart-rate monitor sensor solution. It combines two LED’s, a photo detector, optimized optics, and low-noise analog signal processing to detect pulse and heart-rate signals.
6. It operates from 1.8V and 3.3V power supplies and can be powered down through software with negligible standby current, permitting the power supply to remain connected at all times.
7. The main features are Consumes very low power, Ultra-Low shutdown current, and Fast Data Output Capability.