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Member Since: March 22, 2007

Country: United States

  • I’m trying to use this to detect a black stripe on a white rotating disk, with the sensor configured as in the Bildr tutorial. However, with the disc close (1/8-3/6" maybe) to the sensor, there’s almost no noticeable difference in the value reported through analogRead for white vs black sections of the disk. With the disk removed (nothing reflecting, value should come from ambient light), it reads around 983. White areas read around 36-38; black around 40-44. I was hoping for a much larger difference. Is the disk too close to the sensor? Is the black ink I’m using too IR-reflective? Something else?

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