Optoreflector - Revision history

129.105.69.231: /* Example Analog Circuit */

2006-08-11T15:23:26Z

Example Analog Circuit

2006-08-11T15:23:03Z

Example Digital Circuit 2

2006-08-11T01:33:24Z

Example Analog Circuit

2006-08-11T01:33:07Z

2006-08-11T01:28:34Z

2006-08-11T01:27:40Z

2006-08-11T01:27:22Z

2006-08-11T01:26:24Z

Application

2006-08-11T01:20:47Z

Application

2006-08-11T00:27:57Z

Example Circuit 2

← Older revision		Revision as of 15:23, 11 August 2006
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	[[Image:optoreflector_analog_photo.jpg\|400 px]]		[[Image:optoreflector_analog_photo.jpg\|400 px]]

	The Simulink model for the example above can be downloaded here:[[~~Image~~:optoreflector_analog_XPC_program.zip]]		The Simulink model for the example above can be downloaded here:[[media:optoreflector_analog_XPC_program.zip\|optoreflector_analog_XPC_program.zip]]

@@ Line 33: / Line 33: @@
 The Simulink model can be downloaded here:
-[[Image:optoreflector_ex2_XPC_program.zip]]
+[[media:optoreflector_ex2_XPC_program.zip|optoreflector_ex2_XPC_program.zip]]
 ===Example Analog Circuit===

← Older revision		Revision as of 01:33, 11 August 2006
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	[[Image:optoreflector_analog_photo.jpg\|400 px]]		[[Image:optoreflector_analog_photo.jpg\|400 px]]

	The Simulink model can be downloaded here:[[Image:optoreflector_analog_XPC_program.zip]]		The Simulink model for the example above can be downloaded here:[[Image:optoreflector_analog_XPC_program.zip]]

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 [[Image:optoreflector_ex2_schematic.png]] [[Image:optoreflector_ex2_photo.jpg |300 px]]
-The following XPC target program will count the number of times the sensor is tripped, and print it to the [[Using_RS-232_and_Printing_to_LCD|Seetron BPI-216 LCD]].  To use it, plug  the output of the ciruit above into channel 2 of the digital input on the break-out board.  Pressing ''Bit 1'' on the break-out board will reset the count.
+The following XPC Target program will count the number of times the sensor is tripped, and print it to the [[Using_RS-232_and_Printing_to_LCD|Seetron BPI-216 LCD]].  To use it, plug  the output of the ciruit above into channel 2 of the digital input on the break-out board.  Pressing ''Bit 1'' on the break-out board will reset the count.
 [[Image:optoreflector_ex2_photo2.jpg | 400 px]]

@@ Line 40: / Line 40: @@
 [[Image:optoreflector_analog_schematic.png]]
-[[Image:optoreflector_analog_photo.jpg]]
+[[Image:optoreflector_analog_photo.jpg|400 px]]
 The Simulink model can be downloaded here:[[Image:optoreflector_analog_XPC_program.zip]]

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 __TOC__
 [[Category:Sensors]]
+==Introduction==
 Optoreflector sensors contain a matched infrared transmitter (LED) and infrared receiver (usually a [[Photodiodes and Phototransistors|phototransistor]]) pair. These devices work by measuring the amount of light that is reflected into the receiver. Because the receiver also responds to ambient light, the device works best when well shielded from abient light, and when the distance between the sensor and the reflective surface is small (the graph below shows how distance affects the output value). IR reflectance sensors are often used to detect white and black surfaces. White surfaces generally reflect well, while black surfaces reflect poorly.

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 [[image:qrb1114 xpc program.jpg|center]]
-===Example Circuit 2===
+===Example Digital Circuit 2===
 The circuit below uses hardware to process the signal and uses the PC/104 stack's digital input.  Increasing the value of the resistor ''R1'' will increase the sensitivity, and vice versa.  Beware that if you make the sensor too sensitive, ambient light will be able to trip the sensor.
@@ Line 31: / Line 31: @@
 [[Image:optoreflector_ex2_XPC_program.zip]]
+===Example Analog Circuit===
+To make an analog circuit, just take out the Schmitt trigger from Example Digital Circuit 2, and connect the input directly to the analog input on the break-out board.  The ADC will output the closest integer voltage of the input between -10V and 10V.  For this circuit, the voltage will fall between 0V and 5V.
+[[Image:optoreflector_analog_schematic.png]]
+[[Image:optoreflector_analog_photo.jpg]]
+[[Image:optoreflector_analog_XPC_program.zip]]

@@ Line 5: / Line 5: @@
 ==Application==
-===Example Circuit 1===
+===Example Digital Circuit===
 In the mechatronics lab, we have the QRB1114 ([[media:QRB1114.pdf|datasheet]]) from [http://www.fairchild.com Fairchild], shown below.  It has four pins, with the first pair connected to the LED and the second pair connected to the phototransistor.