Products for USB Sensing and Control
Products for USB Sensing and Control

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## Light Sensor 1000 lux

ID: 1142_0
Mature: This product (or a similar replacement with a compatible form, fit and function) will be produced as long as the parts and components required to make it are available.

Measures light intensities of up to 1000 lux and connects to an Analog Input or VINT Hub port.

## $7.00 Quantity Available: 1000+ Qty Price 5$6.65
10 $6.30 25$5.60
50 $4.90 100$4.55

The 1142 Light sensor can measure ambient light up to 1000 lux (roughly equivalent to the typical lighting in a studio, or the sky on an overcast day). Each sensor has been individually calibrated, and a label has been applied to the back of the board with a calibration value which can be used in your calculations to increase measurement accuracy.

Some light sensors report drastically different values depending on the type of light being detected. The 1142 light sensor, however, only differs by a factor of 1.2 when measuring fluorescent light versus incandescent.

If you need a larger measurement range, take a look at the 1143 – Light Sensor 70,000 lux.

#### Interface Boards and Hubs

This sensor can be read by any Phidget with an Analog Input or VINT Hub port. It will connect to either one using the included Phidget cable. VINT Hub ports can behave just like Analog Inputs, but have the added flexibility of being able to be used as digital inputs, digital outputs, or ports to communicate with VINT devices. For more information about VINT, see the VINT Primer.

Product Voltage Inputs
Image Part Number Price Number of Voltage Inputs Voltage Input Resolution
1010_0 $80.00 8 10 bit 1011_0$50.00 2 10 bit
1018_2B $80.00 8 10 bit 1019_1B$110.00 8 10 bit
1203_2B $70.00 8 10 bit DAQ1000_0$20.00 8 12 bit
HUB0000_0 $30.00 6 (Shared) * 16 bit SBC3003_0$120.00 6 (Shared) * 16 bit

#### Phidget Cables

This sensor comes with its own Phidget cable to connect it to an InterfaceKit or Hub, but if you need extras we have a full list down below. You can solder multiple cables together in order to make even longer Phidget cables, but you should be aware of the effects of having long wires in your system.

Product Physical Properties
Image Part Number Price Cable Length
3002_0 $2.00 600 mm 3003_0$1.50 100 mm
3004_0 $3.00 3.5 m 3034_0$1.50 150 mm
3038_0 $2.25 1.2 m 3039_0$2.75 1.8 m
CBL4104_0 $1.75 300 mm CBL4105_0$2.00 900 mm
CBL4106_0 $2.50 1.5 m ## 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: 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: 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: 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: ### 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: ${\displaystyle {\text{Illuminance (lux)}}=m\times ({\text{Voltage}}\times 200)+b\!}$ 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 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. This device doesn't have an API of its own. It is controlled by opening a VoltageRatioInput channel on the Phidget that it's connected to. For a list of compatible Phidgets with VoltageRatio Inputs, see the Connection & Compatibility tab. You can find details for the VoltageRatioInput API on the API tab for the Phidget that this sensor connects to. #### Product Specifications Sensor Properties Sensor Type Light Controlled By Voltage Input (0-5V) Sensor Output Type Non-Ratiometric Light Sensor Response Time Max 2 ms Peak Sensitivity Wavelength 625 nm Light Level Min 1 lx Light Level Max (5V) 1 klx Light Current Ratio 1.2 Electrical Properties Output Impedance 1 kΩ Supply Voltage Min 2.4 V DC Supply Voltage Max 5.5 V DC Current Consumption Max 5 mA Physical Properties Operating Temperature Min -40 °C Operating Temperature Max 85 °C #### Documents #### Projects #### Product History Date Board Revision Device Version Comment Oct 20120 N/A Product Release #### Have a look at our light sensors: Product Sensor Properties Light Sensor Image Part Number Price Sensor Type Controlled By Light Level Min Light Level Max (5V) 1142_0$7.00 Light Voltage Input (0-5V) 1 lx 1 klx
1143_0 $7.00 Light Voltage Input (0-5V) 3 lx 70 klx LUX1000_0$12.00 Light VINT 188 μlx 220 klx