The 1143 Light sensor can measure ambient light up to 70 kilolux (roughly equivalent to the brightness of direct sunlight). 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. The sensor's output is logarithmic, so it will be more accurate at low light levels.
Some light sensors report drastically different values depending on the type of light being detected. The 1143 light sensor, however, only differs by a factor of 1.2 when measuring fluorescent light versus incandescent.
If you want greater resolution with a smaller measurement range, take a look at the 1142 – Light Sensor 1000 lux.
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.
|Image||Part Number||Price||Number of Voltage Inputs||Voltage Input Resolution|
|HUB0000_0||$30.00||6 (Shared)||* 16 bit|
|SBC3003_0||$120.00||6 (Shared)||* 16 bit|
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.
Welcome to the 1143 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the 1143!
In order to demonstrate the functionality of the 1143, 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 1143.
After plugging in the 1143 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:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
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:
The 1143 has a logarithmic output, which means it will be more accurate at lower light levels.
The 1143 uses the APDS-9007 light sensor package. The following graph illustrates the sensor's sensitivity to specific wavelengths of light.
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 luminosity is:
Where 'm' and 'b' are calibration values found on the label on the underside of the 1143. If for some reason you can't use the calibration values that come with the sensor, you can use the generalized values of m = 0.02385 and b = -0.56905 to get a rough approximation.
Note that because this sensor is non-ratiometric and logarithmic, the output voltage of the sensor will not exceed ≈ 2.5V (Which, using the above formula, should correspond to 70,000 lx).
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.
This device doesn't have an API of its own. It is controlled by opening a VoltageInput channel on the Phidget that it's connected to. For a list of compatible Phidgets with Voltage Inputs, see the Connection & Compatibility tab.
You can find details for the VoltageInput API on the API tab for the Phidget that this sensor connects to.
|Controlled By||Voltage Input (0-5V)|
|Sensor Output Type||Non-Ratiometric|
|Response Time Max||0.5 ms|
|Peak Sensitivity Wavelength||560 nm|
|Light Level Min||3 lx|
|Light Level Max (5V)||70 klx|
|Light Current Ratio||1.2|
|Current Consumption Max||500 μA|
|Output Impedance||0 Ω|
|Supply Voltage Min||4 V DC|
|Supply Voltage Max||5.5 V DC|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|Oct 2012||0||N/A||Product Release|