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What should be the distance between the object and the sensor (TCRT5000L), for sensor to be able to detect it? I foun in datasheet operating distance is 0.2 to 0.15mm, but it seems little to me.

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  • \$\begingroup\$ Figure 9 in the datasheet shows you the signal vs. distance for a reflective target. You want to be within that range or closer if your target is not very reflective. \$\endgroup\$ – user1850479 Oct 3 '20 at 15:26
  • \$\begingroup\$ With software augmentation, I've seen these give detectable signals off white ceiling tiles (about 2M away). The difference between photodetector output with LED switched on/off was added together from multiple pulses. Much better range than a simple DC method. \$\endgroup\$ – glen_geek Oct 3 '20 at 15:48
  • \$\begingroup\$ Please link to the datasheet in future questions. Make it easy for your readers. \$\endgroup\$ – Transistor Oct 3 '20 at 15:51
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enter image description here

Read the datasheet again. 0.2 to 15 mm, not 0.2 to 0.15 mm.

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