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IR distance ranger covers 1 to 20 cm: 04/11/2002  EDN - Design Ideas / 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.

PIC16F84 Ultrasonic Range Finder Project:

Ultrasonic Rangefinder:

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