LDR resistance measurement
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Measuring LDR resistance from dusk to night
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Schematic and descriptionhttp://electromotiveforces.blogspot.com/2011/05/measuring-ldr-resistance-from-dusk-to.html
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circuit positioned by the window with LDR pointing toward the sky
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DMMFluke 8842A DCV auto ranging mode
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Vdd4.987volts
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R21.014Mohm
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voltage reading across R2 (volts)computed LDR resistance (Mohms)
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Time of day14-May-201115-May-201117-May-2011Time of day14-May-201115-May-201117-May-2011
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5:30 PM4.9795:30 PM#DIV/0!0.002#DIV/0!
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5:35 PM4.9775:35 PM#DIV/0!0.002#DIV/0!
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5:40 PM4.9594.9755:40 PM0.0060.002#DIV/0!
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5:45 PM4.9554.9734.9715:45 PM0.0070.0030.003
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5:50 PM4.9524.9714.9695:50 PM0.0070.0030.004
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5:55 PM4.9484.9694.9605:55 PM0.0080.0040.006
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6:00 PM4.9404.9654.9516:00 PM0.0100.0040.007
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6:05 PM4.9294.9584.9456:05 PM0.0120.0060.009
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6:10 PM4.8804.9444.9326:10 PM0.0220.0090.011
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6:15 PM4.8374.9274.9166:15 PM0.0310.0120.015
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6:20 PM4.7364.8974.8746:20 PM0.0540.0190.024
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6:25 PM4.4574.8144.6826:25 PM0.1210.0360.066
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6:30 PM3.7914.4433.8286:30 PM0.3200.1240.307
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6:35 PM2.4303.3872.6786:35 PM1.0670.4790.874
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6:40 PM1.0761.9081.4736:40 PM3.6861.6362.419
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6:45 PM0.5000.8830.7586:45 PM9.1004.7135.657
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6:50 PM0.3510.5520.4596:50 PM13.3938.14710.003
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6:55 PM0.3130.4300.3526:55 PM15.14210.74613.352
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7:00 PM0.3170.3210.3147:00 PM14.93814.73915.091
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7:05 PM0.3150.2970.3057:05 PM15.03916.01215.566
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7:10 PM0.3230.2970.3687:10 PM14.64216.01212.727
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7:15 PM0.2970.4527:15 PM#DIV/0!16.01210.174
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7:20 PM0.2960.4597:20 PM#DIV/0!16.07010.003
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7:25 PM0.3040.3747:25 PM#DIV/0!15.62012.507
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7:30 PM0.3020.3497:30 PM#DIV/0!15.73013.475
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dusk to night
predawn to sunrise