Photoelectric Smoke Detector IC with I/O: MC145010P
Smoke particle sensor box:
Corroded Piezo speaker:
Interestingly the optical smoke detection chamber looks similar to what’s inside a optical dust sensor like the Shinyei PPD42NS. Wonder if it might get triggered if you stir up some dust under it.
Yes, that sometimes works. For obvious reasons this one was replaced with a new one, which erroneously triggered an alarm a couple of times. It turned out to be accumulated dust inside the test chamber. The error went away after blowing some air into it.
ahh i see. not sure if Americium-based smoke detectors are more accurate compared to these optical types.
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