ESP8266 SPO2 and Pulse meter using MAX30102 sensor. The ESP8266 acts as a WiFi Access Point and web page server. SPO2 and heart rate measurements are displayed on a browser and updated every 4 seconds.

• ESP8266 Wemos D1 Mini board
• home-brew MAX30102 breakout board (MAX30102 modules are available on AliExpress)
• Arduino 1.8.12 on Ubuntu 20.04 amdx64

This is a mashup of code from the following projects :

• MAX30102 sensor initialization and FIFO readout code from Sparkfun

• SPO2 & pulse rate measurement code by Robert Fraczkiewicz from aromring's repository. I tweaked RF's implementation to use 50Hz sample rate.

• ESP8266 WiFi Access Point & Webpage server code from Random Nerd tutorials

• Connect to the WiFi Access Point "SPO2-Pulse". There is no password, but you can define one if you like.
• Open the url 192.168.4.1 in your web browser
• A new measurement is displayed every 4 seconds

• If the measurement fails (finger not present, disturbed while reading), the value will display as 0
• If unable to detect the MAX30102 sensor on power-up, the board built-in LED will blink rapidly. Try cycling power to the board.
• In normal operation, the board built-in LED will toggle every 4-second measurement cycle
• You can compile the code in debug mode to check the actual sample rate (required for the SPO2/Pulse algorithm). Or you can display real-time red and ir sensor data on the Arduino Serial Plotter window, to determine an optimal sensor led current setting.