Hello, I'm a student and trying to figure out how to use an arduino board to make a breathalyzer. The part I'm stuck on is not the alcohol reader (I'm using an MQ-3), but rather the air flow sensor. I need to ensure a constant flow is kept for 5 seconds. I've been searching the web but couldn't come up with much. Any help or suggestions for a component and programming would be greatly appreciated!
Cheers
The easy way to detect air flow, is to install temperature sensor and and warm resistor in close proximity. Passing air would create a cooling effect, dropping reported temperature. Practical realization and coding for you