Last Updated on March 29, 2024 by pg@petergamma.org
In the www.openbci.com forum it says
«The OpenBCI boards are primarily for measuring biosignals using a differential amplifier (plus and minus poles): such signals as EEG, ECG, EMG, EOG, etc. These signals are in the range of say tens (or more) of millivolts (EMG and ECG) down to 1 microvolt (lowest EEG).
One might expect that a spirometer device in the modern era, might have a Bluetooth interface for interacting with phone apps. This would be the recommended way to go. You would find out from the manufacturer the details of the Bluetooth interface and how to collect that data stream in your own app. Your same app could also be collecting the OpenBCI data streams, via the Brainflow library.
https://brainflow.org/
https://brainflow.readthedocs.io/en/stable/Examples.html
You need to be careful in connecting external devices that are mains powered to any OpenBCI board. This is because of safety concerns. In the event of circuit failures, the external device could end up shorting hundreds of volts (or more) into the board pins. And thereby connecting such voltages to the electrodes on the head or heart.
https://www.google.com/search?q=spirometer+with+bluetooth
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https://openbci.com/forum/index.php?p=/discussion/3706/spirometer-and-other-inputs/p1