# Pulse Oximeter Wireless Data Logger ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/090/572/medium800/biometric_IMG_1966.jpg?1587567157) ![](https://cdn-learn.adafruit.com/assets/assets/000/090/589/medium800/biometric_data2.png?1587580700) You can measure your blood oxygen level and pulse rate using a fingertip pulse oximeter -- and now with this project you can log that data wirelessly onto an SD card! Bring the comma-separated log file into your graphing software or quantified self apps for total control of your data! Using a **Feather nRF52840 Express** with the **Adalogger FeatherWing** for real-time clock and SD card read/write capabilities. Code it all in CircuitPython and you'll be automatically logging data each time you use the pulse oximeter. ## Parts ### Adafruit Feather nRF52840 Express [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062) The **Adafruit Feather nRF52840 Express** is the new Feather family member with Bluetooth® Low Energy and _native USB support_ featuring the nRF52840!  It's our take on an 'all-in-one' Arduino-compatible + Bluetooth® Low Energy with built-in USB... Out of Stock [Buy Now](https://www.adafruit.com/product/4062) [Related Guides to the Product](https://learn.adafruit.com/products/4062/guides) ![Angled shot of a Adafruit Feather nRF52840 Express. ](https://cdn-shop.adafruit.com/640x480/4062-02.jpg) ### Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards [Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards](https://www.adafruit.com/product/2922) A Feather board without ambition is a Feather board without FeatherWings! This is the **Adalogger FeatherWing** : it adds both a battery-backed Real Time Clock and micro SD card storage to any Feather main board. Using our [Feather...](https://www.adafruit.com/products/2830) Out of Stock [Buy Now](https://www.adafruit.com/product/2922) [Related Guides to the Product](https://learn.adafruit.com/products/2922/guides) ![Adalogger FeatherWing with Real time clock and SD card slot.](https://cdn-shop.adafruit.com/640x480/2922-11.jpg) ### CR1220 12mm Diameter - 3V Lithium Coin Cell Battery [CR1220 12mm Diameter - 3V Lithium Coin Cell Battery](https://www.adafruit.com/product/380) These are the highest quality & capacity batteries, the same as shipped with the iCufflinks, iNecklace, Datalogging and GPS Shields, GPS HAT, etc. One battery per order (you'll want one battery per cufflink or pendant.) Brand may vary but all battery brands are verified... In Stock [Buy Now](https://www.adafruit.com/product/380) [Related Guides to the Product](https://learn.adafruit.com/products/380/guides) ![Angled shot of CR1220 12mm Diameter - 3V Lithium Coin Cell Battery - CR1220.](https://cdn-shop.adafruit.com/640x480/380-01.jpg) ### FeatherWing Doubler - Prototyping Add-on For All Feather Boards [FeatherWing Doubler - Prototyping Add-on For All Feather Boards](https://www.adafruit.com/product/2890) This is the **FeatherWing Doubler** - a prototyping add-on and more for all Feather boards. This is similar to our [FeatherWing Proto](https://www.adafruit.com/products/2884) except there are two! The magic of the Doubler comes when stacking a Feather and another... In Stock [Buy Now](https://www.adafruit.com/product/2890) [Related Guides to the Product](https://learn.adafruit.com/products/2890/guides) ![Double prototyping feather wing PCB with socket headers installed](https://cdn-shop.adafruit.com/640x480/2890-01.jpg) ### USB A/Micro Cable - 2m [USB A/Micro Cable - 2m](https://www.adafruit.com/product/2185) This is your standard USB A-Plug to Micro-USB cable. It's 2 meters long so you'll have plenty of cord to work with for those longer extensions. Out of Stock [Buy Now](https://www.adafruit.com/product/2185) [Related Guides to the Product](https://learn.adafruit.com/products/2185/guides) ![USB Cable with Type A and Micro B ends](https://cdn-shop.adafruit.com/640x480/2185-00.jpg) ### Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh [Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh](https://www.adafruit.com/product/3898) Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of **400mAh** for a total of about 1.9 Wh. If you need a larger (or smaller!)... In Stock [Buy Now](https://www.adafruit.com/product/3898) [Related Guides to the Product](https://learn.adafruit.com/products/3898/guides) ![Slim Lithium Ion Polymer Battery 3.7v 400mAh with JST 2-PH connector and short cable](https://cdn-shop.adafruit.com/640x480/3898-05.jpg) - [Next Page](https://learn.adafruit.com/pulse-oximeter-wireless-data-logger/circuitpython-for-feather-nrf52840.md) ## Featured Products ### Adafruit Feather nRF52840 Express [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062) The **Adafruit Feather nRF52840 Express** is the new Feather family member with Bluetooth® Low Energy and _native USB support_ featuring the nRF52840!  It's our take on an 'all-in-one' Arduino-compatible + Bluetooth® Low Energy with built-in USB... Out of Stock [Buy Now](https://www.adafruit.com/product/4062) [Related Guides to the Product](https://learn.adafruit.com/products/4062/guides) ### Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards [Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards](https://www.adafruit.com/product/2922) A Feather board without ambition is a Feather board without FeatherWings! This is the **Adalogger FeatherWing** : it adds both a battery-backed Real Time Clock and micro SD card storage to any Feather main board. Using our [Feather...](https://www.adafruit.com/products/2830) Out of Stock [Buy Now](https://www.adafruit.com/product/2922) [Related Guides to the Product](https://learn.adafruit.com/products/2922/guides) ### Finger Pulse Oximeter with Bluetooth LE [Finger Pulse Oximeter with Bluetooth LE](https://www.adafruit.com/product/4582) [Discontinued - **you can grab the ** Finger Pulse Oximeter - BM1000 **instead!**](https://www.adafruit.com/product/4580) This  **Finger Pulse Oximeter with Bluetooth LE ** is great for monitoring your blood oxygen levels and pulse... No Longer Stocked [Buy Now](https://www.adafruit.com/product/4582) [Related Guides to the Product](https://learn.adafruit.com/products/4582/guides) ### SD/MicroSD Memory Card - 16GB Class 10 - Adapter Included [SD/MicroSD Memory Card - 16GB Class 10 - Adapter Included](https://www.adafruit.com/product/2693) Add speedy mega-storage in a jiffy using this 16 GB Class 10 micro-SD card. It comes with a SD adapter so you can use it with any of our shields or adapters! Preformatted to FAT so it works out of the box with our projects. Works great with any device in the Adafruit shop that uses micro-SD... No Longer Stocked [Buy Now](https://www.adafruit.com/product/2693) [Related Guides to the Product](https://learn.adafruit.com/products/2693/guides) ### FeatherWing Doubler - Prototyping Add-on For All Feather Boards [FeatherWing Doubler - Prototyping Add-on For All Feather Boards](https://www.adafruit.com/product/2890) This is the **FeatherWing Doubler** - a prototyping add-on and more for all Feather boards. This is similar to our [FeatherWing Proto](https://www.adafruit.com/products/2884) except there are two! The magic of the Doubler comes when stacking a Feather and another... In Stock [Buy Now](https://www.adafruit.com/product/2890) [Related Guides to the Product](https://learn.adafruit.com/products/2890/guides) ### USB A/Micro Cable - 2m [USB A/Micro Cable - 2m](https://www.adafruit.com/product/2185) This is your standard USB A-Plug to Micro-USB cable. It's 2 meters long so you'll have plenty of cord to work with for those longer extensions. Out of Stock [Buy Now](https://www.adafruit.com/product/2185) [Related Guides to the Product](https://learn.adafruit.com/products/2185/guides) ### Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh [Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh](https://www.adafruit.com/product/3898) Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of **400mAh** for a total of about 1.9 Wh. If you need a larger (or smaller!)... In Stock [Buy Now](https://www.adafruit.com/product/3898) [Related Guides to the Product](https://learn.adafruit.com/products/3898/guides) ### CR1220 12mm Diameter - 3V Lithium Coin Cell Battery [CR1220 12mm Diameter - 3V Lithium Coin Cell Battery](https://www.adafruit.com/product/380) These are the highest quality & capacity batteries, the same as shipped with the iCufflinks, iNecklace, Datalogging and GPS Shields, GPS HAT, etc. One battery per order (you'll want one battery per cufflink or pendant.) Brand may vary but all battery brands are verified... In Stock [Buy Now](https://www.adafruit.com/product/380) [Related Guides to the Product](https://learn.adafruit.com/products/380/guides) ## Related Guides - [Introducing the Adafruit nRF52840 Feather](https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather.md) - [BLE Synth with the Feather nRF52840 and Circuit Playground Bluefruit](https://learn.adafruit.com/ble-synth-with-the-feather-nrf52840-and-circuit-playground-bluefruit.md) - [Daily Cheer Automaton](https://learn.adafruit.com/daily-cheer-automaton.md) - [HID Reporter](https://learn.adafruit.com/hid-reporter.md) - [Getting Started with CircuitPython and Bluetooth Low Energy](https://learn.adafruit.com/circuitpython-nrf52840.md) - [Color Sensing Music Player](https://learn.adafruit.com/color-sensing-music-player.md) - [Bluetooth Restroom Key Proximity Tracker](https://learn.adafruit.com/bluetooth-restroom-key-proximity-tracker.md) - [7 Segment Display Internet Clock](https://learn.adafruit.com/7-segment-display-internet-clock.md) - [CircusPython: Jump through Hoops with CircuitPython Bluetooth LE](https://learn.adafruit.com/circuspython-jump-through-hoops-with-bluetooth-le.md) - [Doomscroll and Chill - A Wireless BLE Scroll Wheel Remote](https://learn.adafruit.com/doomscroll-and-chill-wireless-ble-scroll-wheel-rotary-encoder-remote.md) - [Quickstart - Raspberry Pi RP2040 with BLE and CircuitPython](https://learn.adafruit.com/quickstart-raspberry-pi-rp2040-with-ble-and-circuitpython.md) - [DIY Desktop Calculator with CircuitPython ](https://learn.adafruit.com/diy-rpn-desktop-calculator-with-circuitpython.md) - [MIDI Laser Harp with Time of Flight Distance Sensors](https://learn.adafruit.com/midi-laser-harp-time-of-flight-sensors.md) - [Homefruit FeatherWing Tester](https://learn.adafruit.com/homefruit-featherwing-tester.md) - [BLE HID Keyboard Buttons with CircuitPython](https://learn.adafruit.com/ble-hid-keyboard-buttons-with-circuitpython.md) - [RP2040 RunCPM Emulator with USB Keyboard & HDMI screen](https://learn.adafruit.com/rp2040-runcpm-emulator-with-usb-keyboard-hdmi-screen.md)