Project 4: Photoresistors generating widely unreliable output

i've been trying trouble-shoot on own few hours , can't figure out issue is.

the 3 photoresistors generating inconsistent numbers. below readouts taken @ 3 second intervals (i added delay(3000) code). in first 5 readouts, resistors uncovered. in second set of 5 covered red resistor completely.

note there significant variation while sensor not covered, , covering sensor doesn't seem affect output @ (it equally inconsistent).

the light source daylight window--there no perceptible variation moment moment in quality or intensity of light. tried moving board darker environment , flickered more.

thanks might able offer.


not covering red sensor
raw sensor value              red:859    green:860    blue:860
mapped sensor values     red:214     green:215    blue:215

raw sensor value              red:537    green:471    blue:470
mapped sensor values     red:134     green:117    blue:117

raw sensor value              red:296    green:852    blue:860
mapped sensor values     red:74     green:213    blue:215

raw sensor value              red:833    green:695    blue:694
mapped sensor values     red:208     green:173    blue:173

raw sensor value              red:330    green:850    blue:859
mapped sensor values     red:82     green:212    blue:214


covering red sensor
raw sensor value              red:450    green:454    blue:363
mapped sensor values     red:112     green:113    blue:90

raw sensor value              red:280    green:677    blue:452
mapped sensor values     red:70     green:169    blue:113

raw sensor value              red:830    green:686    blue:585
mapped sensor values     red:207     green:171    blue:146

raw sensor value              red:670    green:671    blue:518
mapped sensor values     red:167     green:167    blue:129

raw sensor value              red:664    green:835    blue:697
mapped sensor values     red:166     green:208    blue:174


not covering red sensor
raw sensor value              red:829    green:516    blue:433
mapped sensor values     red:207     green:129    blue:108

raw sensor value              red:291    green:271    blue:282
mapped sensor values     red:72     green:67    blue:70

raw sensor value              red:281    green:848    blue:527
mapped sensor values     red:70     green:212    blue:131

raw sensor value              red:304    green:829    blue:848
mapped sensor values     red:76     green:207    blue:212

raw sensor value              red:828    green:685    blue:828
mapped sensor values     red:207     green:171    blue:207

raw sensor value              red:691    green:584    blue:607
mapped sensor values     red:172     green:146    blue:151

Arduino Forum > Products > The Arduino Starter Kit and Basic Kit > Project 4: Photoresistors generating widely unreliable output

arduino