IR distance ranger covers 1 to 20 cm


Posted on May 23, 2012

Commercially available IR distance rangers typically handle a 3- to 30-in. detection distance. Many times, it is necessary to determine smaller distances. The circuit in Figure 1 is useful for measuring small distances to reflective surfaces. Its measurement range is from less than 1 cm to approximately 20 cm for a flat, white surface. The output of the circuit is an active-high pulse at connector P1.






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