Wireless heart rate and oxygen saturation monitor

In this paper a wireless microcontroller based heart rate and oxygen saturation monitor, known as pulse oximeter, is described. Pulse oximetry is a non-invasive method which uses the signal of two light sources at different wavelength and a photodetector to capture the amount of light that is transmitted through a tissue. The signal captured, named photoplethysmogram signal PPG, is used to determine Oxygen Saturation SpO2 and Heart Rate HR. The system presented has the peculiarity that it is connected to a wireless local network though Wi-Fi technology; the information is transmitted in real time to a webpage for remote monitoring. The measurements obtained are compared with a commercial pulse oximeter using the Bland-Altman method. The obtained results present reliable measurements of SpO2 and HR.