Good day, Masters! I need to determine the RPM of the exhaust fan using a reflective photomicrosensor connected to an arduino. Here's the link for the datasheet http://www.ia.omron.com/data_pdf/data_sheet/ee-spy31_41_dsheet_csm479.pdf and here's the output circuit of the sensor I connected it …

EE-SPY411 Reflective Photomicrosensor

system May 21, 2014, 5:19am 4

Did you ever connect it to power WITHOUT the 180 ohm resistor in series with the diode ?
Do you know how to use a multimeter on diode scale?

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