Originally Posted by Laughing_Gnome_Invisible
And all this from the same country that thought the depiction during the Olympics opening ceremony of Isambard Kingdom Brunel was a character from a Dickens novel. Get a grip guys. Most of you are NOT engineers.
I'm one. Not just in degree, but I actually design electronic devices, mostly medical. Schematic design, PCB layout, firmware, soldering, debugging. I have a 1-man consulting company. I know there are others here.
I just finished the board layout for a really cool O2 sensor tonight. It will measure the O2 concentration using light. I bounce red light off a tablet that contains a powder that fluoresces. There is a very small time lag (nanoseconds) between when the red light hits the tablet and when it floresces. I blast the tablet with a high-frequency sine wave then use FFT (fast fourier transform) to measure the lag in response. This lag is proportional to the amount of O2 where the tablet is.
The cool thing is that it can be used in liquid, so works with beer!
Once I get it working I'll watch the O2 deplete in my carboy during fermentation. Can't wait.