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This system uses a single phototransistor to provide three position signals (low, nominal, high) depending upon the position of the sensed item.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
75% of the total text.
Page 1 of 1
Tri-State Position Sensing System
This system uses a single phototransistor to provide three position signals
(low, nominal, high) depending upon the position of the sensed item.
Referring to the Figure, the system is illustrated schematically. The
phototransistor 10 is driven by a light emitting diode (LED) light source 15. A
position sensing finger 20, in contact with the sensed item, is coupled to and
activates a sensor flag 25. As the position of the sensed item moves, the output
voltage of the phototransistor 10 changes in relation to the position of the
position-sensing finger 20 and the sensor flag 25.
The signal output range of the phototransistor is 0.0 to 12.0
volts. This output voltage is fed to two operational amplifier
comparators A,B, which have the following switching and hysteresis
COMPARATOR --------- ON ------- OFF ------ HYSTERESIS BAND
A = ----------- 8.00 V. -- 4.00 V. -- 4.00 V.
B = ----------- 6.05 V. -- 6.00 V. -- .05 V.
The output conditions (ON = 1 OFF = 0) of the comparators are
monitored and decoded through a microprocessor 30 utilizing
microcodes to determine the position of the sensing finger 25 as
follows: COMPARATOR --------- ____________POSITION____________
LOW ------- NOMINAL ------- HIGH
A = ------------ 0 ------- 0 --- 1 ------- 1
B = ------------ 0 ------- 1 --- 0 ------- 1
Note that the nominal position is the exclusive "OR" function
of the conditions. Additionally, the decoding of the conditions in