1142 User Guide: Difference between revisions

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__NOINDEX__
<metadesc>The Phidget Light Sensor measures light intensities of up to 1000 lux and connects to an Analog Input or VINT Hub port.</metadesc>
[[Category:UserGuide]]
[[Category:UserGuide]]
{{UserguideTOC|1142.jpg|1142}}
==Getting Started==
==Getting Started==
{{UgSensorIntro|1142|Light Sensor 1000 lux|Voltage Input port}}


===Checking the Contents===
{{UGbox|
'''You should have received:'''
* A light sensor
* A sensor cable
|
'''In order to test your new Phidget you will also need:'''
* A PhidgetInterfaceKit 8/8/8 or a PhidgetTextLCD
* A USB cable
||}}


===Connecting the Pieces===
Next, you will need to connect the pieces:
{{UGbox|
[[Image:1142_0_Connecting_The_Hardware.jpg|400px|right|link=]]
#Connect the Light Sensor to an Analog Input on the PhidgetInterfaceKit 8/8/8 using the sensor cable.
# Connect the 1142 to the HUB0000 with the Phidget cable.
#Connect the PhidgetInterfaceKit to your PC using the USB cable.
# Connect the HUB0000 to your computer with the USB cable.
|
[[File:1142_0_Connecting_The_Hardware.jpg|400px|link=]]
||}}


===Testing Using Windows 2000 / XP / Vista / 7===
<br clear="all">
{{UGIntroDone|1142}}


{{UGwin}}
==Using the 1142==
{{UGcontrolpanelSensor|1142|HUB0000}}


===Running Phidgets Sample Program===
{{UGSensorVoltageInput|1142|illuminance (lux)}}


{{UGwin2|'''InterfaceKit-full'''}}
==Technical Details==
 
===General===
{{UGbox6|
The human eye is less sensitive to changes in light intensity than the 1142, but is able to see a wider range. The Human eye range is from 50 µlx (starlight) to 100 klx (extremely bright sunny day). The 1142, on the other hand, is able to measure from 1 lx (Moonlight) to 1000 lx (TV studio lighting). If you notice noise on the signal that you cannot perceive yourself, it could be due to incandescent light flicker, or other varying light sources.
Double Click on the [[File:Ph.jpg|link=]] icon to activate the Phidget Control Panel and make sure that the '''Phidget InterfaceKit 8/8/8''' is properly attached  to your PC. 
|[[File:Control_Panel_Screen.jpg|400px|link=]]
|
#Double Click on '''Phidget InterfaceKit 8/8/8''' in the Phidget Control Panel to bring up InterfaceKit-full and check that the box labelled Attached contains the word True.
#Make sure that the Ratiometric box is NOT Ticked.
#Move the Precision Light Sensor around and the amount of human perceivable luminosity is displayed in the Analog in Box.
#You can adjust the input sensitivity by moving the slider pointer.
#Click on the Sensors button to bring up the Advanced Sensor Form.
|
[[File:Sensor InterfaceKit Screen 324NR.jpg|400px|link=]]
|
#In the Sensor box of the input you plugged the sensor into, select the 1142 - Light Sensor from the drop down menu.
#The amount of luminosity in lux is shown here.
#Formula used to convert the analog input SensorValue into lux. The sensor actually outputs in lux.
|
[[File:1142 0 Advanced Sensor Form Screen.jpg|link=|400px]]
}}
 
===Testing Using Mac OS X===
 
{{UGmac| | }}
 
===Using Linux===
 
{{UGlinux}}


===Using Windows Mobile / CE 5.0 / CE 6.0===
The 1142 is non-ratiometric which means that you cannot rely on the sensor saturating at 5 volts. To be conservative, interpret a sensor voltage greater than 4.75V as saturated, with the true light level being unknown.


{{UGce}}
===Sensitivity Response===
The 1142 uses the APDS-9002 light sensor package. The following graph illustrates the sensor's sensitivity to specific wavelengths of light:


==Technical Details==
[[File:APDS9002.jpg|link=|center|600px]]
The human eye is less sensitive to changes in light intensity than the 1142, but is able to see a wider range.  The Human eye range is from 50 µlux (starlight) to 100 klx (extremely bright sunny day).  The 1142, on the other hand,  is able to measure from 1 lux (Moonlight) to 1000 lux (TV studio lighting). If you notice noise on the signal that you cannot perceive yourself, it could be due to incandescent light flicker, or other varying light sources.


The 1142 is Non-Ratiometric which means that you cannot rely on the sensor saturating at 1000 SensorValue.  To be conservative, interpret SensorValue over 950 as saturated, with the true light level being unknown.


===Formulas===
===Formulas===
The formula to translate SensorValue into luminosity is:
{{UGSensorFormula|illuminance (lux)}} The formula to translate voltage into illuminance is:




:<math>
:<math>
\text{Luminosity (lux)} = m * \text{SensorValue} + b \!
\text{Illuminance (lux)} = m \times (\text{Voltage} \times 200) + b \!
</math>
</math>




Where 'm' and 'b' are calibration values found on the label on the underside of the 1142.
Where 'm' and 'b' are calibration values found on the label on the underside of the 1142. If for some reason you can't use the calibration values that come with the sensor, you can use the generalized values of ''' m = 1.478777''' and '''b = 33.67076''' to get a rough approximation.
 
{{UGotherint}}


{{UGasens}}
{{UGasens}}


==Product History==
{{UGnext|}}
{{UGhist}}
{{UGrow|Oct 2012|0 |N/A |Product Release }}

Latest revision as of 20:38, 8 May 2018


Getting Started

Welcome to the 1142 user guide! In order to get started, make sure you have the following hardware on hand:


Next, you will need to connect the pieces:

1142 0 Connecting The Hardware.jpg
  1. Connect the 1142 to the HUB0000 with the Phidget cable.
  2. Connect the HUB0000 to your computer with the USB cable.


Now that you have everything together, let's start using the 1142!

Using the 1142

Phidget Control Panel

In order to demonstrate the functionality of the 1142, we will connect it to the HUB0000, and then run an example using the Phidget Control Panel on a Windows machine.


The Phidget Control Panel is available for use on both macOS and Windows machines. If you would like to follow along, first take a look at the getting started guide for your operating system:


Linux users can follow the getting started with Linux guide and continue reading here for more information about the 1142.

First Look

After plugging in the 1142 into the HUB0000, and the HUB0000 into your computer, open the Phidget Control Panel. You will see something like this:

HUB0000 Panel.jpg


The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:

  • Serial number: allows you to differentiate between similar Phidgets.
  • Channel: allows you to differentiate between similar objects on a Phidget.
  • Version number: corresponds to the firmware version your Phidget is running. If your Phidget is listed in red, your firmware is out of date. Update the firmware by double-clicking the entry.


The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.

Voltage Input

Double-click on a Voltage Input object in order to run the example:

1018 Sensors VoltageInput.png


General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:

  • Modify the change trigger and/or data interval value by dragging the sliders. For more information on these settings, see the data interval/change trigger page.
  • Select the 1142 from the Sensor Type drop-down menu. The example will now convert the voltage into illuminance (lux) automatically. Converting the voltage to illuminance (lux) is not specific to this example, it is handled by the Phidget libraries, with functions you have access to when you begin developing!


Technical Details

General

The human eye is less sensitive to changes in light intensity than the 1142, but is able to see a wider range. The Human eye range is from 50 µlx (starlight) to 100 klx (extremely bright sunny day). The 1142, on the other hand, is able to measure from 1 lx (Moonlight) to 1000 lx (TV studio lighting). If you notice noise on the signal that you cannot perceive yourself, it could be due to incandescent light flicker, or other varying light sources.

The 1142 is non-ratiometric which means that you cannot rely on the sensor saturating at 5 volts. To be conservative, interpret a sensor voltage greater than 4.75V as saturated, with the true light level being unknown.

Sensitivity Response

The 1142 uses the APDS-9002 light sensor package. The following graph illustrates the sensor's sensitivity to specific wavelengths of light:

APDS9002.jpg


Formulas

The Phidget libraries can automatically convert sensor voltage into illuminance (lux) by selecting the appropriate SensorType. See the Phidget22 API for more details. The formula to translate voltage into illuminance is:



Where 'm' and 'b' are calibration values found on the label on the underside of the 1142. If for some reason you can't use the calibration values that come with the sensor, you can use the generalized values of m = 1.478777 and b = 33.67076 to get a rough approximation.

Phidget Cable

Analoginput.jpg

The Phidget Cable is a 3-pin, 0.100 inch pitch locking connector. Pictured here is a plug with the connections labelled. The connectors are commonly available - refer to the Analog Input Primer for manufacturer part numbers.

What to do Next

  • Programming Languages - Find your preferred programming language here and learn how to write your own code with Phidgets!
  • Phidget Programming Basics - Once you have set up Phidgets to work with your programming environment, we recommend you read our page on to learn the fundamentals of programming with Phidgets.