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Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
Infra red proximity sensors
12. April 2008 - 22:36 — admin
Based on a simple basic Idea, this proximity sensor, is easy to build, easy to calibrate and still, it provides a detection range of 35 cm.
In the Ibrahim Kamal's article two different designs are proposed, each one of them is more suitable for different applications. The main difference between the 2 designs is the way infra-red (IR) light is sent on the object. The receiver part of the circuit is exactly the same in both designs.
The second part provides a more advanced IR proximity sensing scheme, as compared to the one proposed in the previous link. It is also more expensive but provides more accurate results even in sunny outdoor environment. This sensor is practically not affected by ambient light, and it can provide detections ranges that exceed 1 meter.