Sensors & Circuits: Difference between revisions
No edit summary |
|||
| Line 1: | Line 1: | ||
==Rotary Encoders== | |||
==Hall Effect== | ==Hall Effect== | ||
Revision as of 04:57, 26 June 2007
Rotary Encoders
Hall Effect
Mulitplexing
IR Distance
Sharp
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.
