Difference: BShinyeiNopPPD42NS (2 vs. 3)
Revision 32022-06-04 - UliRaich
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The Shinyei PPD42NS sensor | ||||||||
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| To get a feeling about the signals emitted by the Shinyei PPD42NS we first write a very simple program (pulses.py) that reads the P1 data line every 1 ms and saves the result in an array. It does so during 10 s. After data taking, the results are printed on the serial line. We can run the program with | ||||||||
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ampy run pulses.py > data.txtand thus redirect the results into a file that can be plotted with gnuplot.  | ||||||||
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| < < | The plot shows a measurement where a match has been lighted and the smoke blown into the sensor. The particle concentration can be measured by calculating the relative time the signal is low with respect to the measurement period. | |||||||
| > > | The plot shows a measurement where a match has been lighted and the smoke blown into the sensor. The particle concentration can be measured by calculating the relative time the signal is low with respect to the measurement period (low occupancy time). | |||||||
--  Uli Raich - 2022-06-01 | ||||||||
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