Pulse Sensor on OLED Display with Wirelings

This tutorial shows you how to read data from the Pulse Oximeter Sensor Wireling and display the temperature in degrees Celsius, BPM, saturated oxygen level, and (visually most importantly) the cardiogram output on any of the OLED Screen Wirelings (0.42", 0.69", and 0.96").

Make sure to go through the OLED Screen Wireling Tutorial and the Pulse Oximeter Sensor Tutorial so that you have all the software you need. Otherwise, you can install the following libraries:

• TinyCircuits MAX30101 Library with examples
• TinyCircuits OLED Display Wireling Libraries:Tinier Screen Library && Graphics Buffer Library

Hardware Assembly

Depending on the development system you choose, you will need to put together a TinyDuino stack using the 32-pin tan connectors, or you will just need to plug in your Wirelings using a Wireling Cable:

• Port 0: Pulse Oximeter Sensor Wireling
• Port 1: OLED Display Wireling (any of the sizes will work as long as the screen variables are edited in the program)

You can change these ports in the included Arduino Sketch using the port variables at the beginning of the program. Match the port number found on the board with the port value set in the code.

Software Setup

To install the MAX30101, Tinier Screen, and Graphics Buffer Arduino libraries, check out our Library Installation Page. Once downloaded from the section above, you can navigate to the examples folder of the MAX30101 library and open the MAX30101_OLED.ino sketch in the Arduino IDE.

Make the correct Tools selections for your development board. If unsure, you can double-check the Help page that mentions the Tools selections needed for any TinyCircuits processor.

The Code!

The program is initialized to work with the 0.42" OLED Screen Wireling. To edit this in the program, comment and uncomment the two lines that match the screen you have so that only the two lines matching your screen are uncommented:

TinierScreen display = TinierScreen(TinierScreen042);
//TinierScreen display = TinierScreen(TinierScreen069);
//TinierScreen display = TinierScreen(TinierScreen096);

GraphicsBuffer screenBuffer = GraphicsBuffer(72, 40, colorDepth1BPP);
//GraphicsBuffer screenBuffer = GraphicsBuffer(96, 16, colorDepth1BPP);
//GraphicsBuffer screenBuffer = GraphicsBuffer(128, 64, colorDepth1BPP);

Upload the program and view the cardiogram data on your OLED Wireling. To get the best pulse readings, gently rest your finger on the Pulse Oximeter Sensor Wireling and try your best to stay still.