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March 29, 2011
about 5 years ago
ok, the last one, the above workaround didn’t solved the problem, it seemed ok in the dark, but the readings were completely (hundreds hz)when i put a small light over the sensor.
found a dirty workaround the readings with the wall plug were 60 hz higher, probably for the 60hz frequency of the power line, so i just subtracted it from the frequency.
i just could not filter the fluctuations caused by the power suply, i used the computer usb as power source, and it gave different readings when the comp was plugged on the wall and when it was just on battery.
Really amazing this chip, i created my account just to make this comment; I made the circuit on the Great Arduino tutorial above and used a buzzer with tone() function to give an audio feedback of the frequency, it had been able, in a dark room with all windows closed and just the arduino´s leds as light source, to perceive and give real time feed back of when i was smoking (i.e sucking) the cigar and when i wasn’t.
Detail: i did it behind a concrete wall, 4 meters away from the sensor. really AMAZING! it could even detect the shadow cast by my hand on the light of the cigar reflected in the wall!
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