Sensors & Circuits

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Hall Effect

Hall Effect on Sensorwiki.org

IR Distance

Reflective Optical Sensor

The reflective optical sensor ( Datasheet ) consists of an infrared LED, labelled "E" for Emitter on the diagrand and on the package, and a phototransistor that passes an amount of current proportional to the reflected light received. The phototransistor is labelled "S" for Sensor. The one leg of the sensor is connected to +5V, which supplies current, and the voltage drop across the 10k resistor that we measure is proportional to the amount of current.

There is a continuous voltage response for objects over a short range of proximity to the sensor. The response is not linear. Linearity can be approximated by the log of the log of the signal.

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