VO2max

Code and build files for Rabbitcreek's VO2Max Spirometer. Incorporating CO2 enhancements from Ulrich Rissel. Build instructions on Instructable See Nik's pages for excellent build details: meteoscientific

Source code for Arduino under "VO2Max" - Arduino board settings to use for TTGO T-Display:

Board: ESP32 Dev Module
Upload Speed: 921600
CPU Frequency: 240Mhz (WiFi/BT)
Flash Frequency: 80Mhz
Flash Mode: QIO
Flash Size: 4MB (32Mb)
Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5 SPIFFS)
Core Debug Level: None`

Source parts, top to bottom. 3M mask with front plate removed, 3D printed case, Oxygen sensor, TTGo T-Display, Flow sensor.

First finished build.

Rebuilding to use CO2 sensor. SCD30 pictured right.

Assembled into case tightly, BM280 barometer addition mounted onto front of tube, wiring for CO2 monitor fed behind and out to top.

Pictured with the CO2 sensor upgrade attached

3D printing files are within the design folder, Ulrich Rissel's design files to use a larger venturi diameter with CO2 sensor holder in design/CO2_upgrade

Additional changes in this version:

• Menu system enhanced with adjustable calibration and setup options.
• Additional GoldenCheetah integration (with VO2 master output)
• CO2 sensor support (Ulrich's mods)