/members-area/b/blog/posts/carbon-dioxide-sensor-and-flow-sensor-mountedTonight I was able to mount the Parallax CO2 sensor and my homemade "flow sensor" on the repurposed respirator mask. The flow sensor is small biscuit fan from an old Sun SCSI tape drive. To make this all work, I first removed the exhalation cage...en-USTelligent Community 12