Replaced by the 1142 - Light Sensor 1000 lux.
The Precision Light Sensor measures human perceptible light level in lux; its measurement range is from 1 lux (Moonlight) to 1000 lux (TV studio lighting)
|Controlled By||Voltage Input (0-5V)|
|Sensor Output Type||Non-Ratiometric|
|Response Time Max||20 ms|
|Measurement Error Max||± 5 %|
|Peak Sensitivity Wavelength||580 nm|
|Light Level Min||1 lx|
|Light Level Max (3.3V)||660 lx|
|Light Level Max (5V)||1 klx|
|Current Consumption Min||2 mA|
|Output Impedance||1 kΩ|
|Supply Voltage Min||3.3 V DC|
|Supply Voltage Max||5 V DC|
|Operating Temperature Min||-30 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|May 2008||0||N/A||Product Release|
Welcome to the 1127 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 1127!
In order to demonstrate the functionality of the 1127, we will connect it to the 1018, 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 1127.
After plugging in the 1127 into the 1018, and the 1018 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 human eye is less sensitive to changes in light intensity than the 1127, but is able to see a wider range. The Human eye range is from 50µlx (starlight) to 100klx (extremely bright sunny day). The 1127, on the other hand, is able to measure from 1lx (Moonlight) to 1000lx (TV studio lighting). The 1127 is able to detect higher frequency fluctuations in light levels than the human eye. If you notice noise on the signal that you cannot perceive yourself, it is probably due to incandescent light flicker, or other varying light sources. This sensor is designed to respond to visible light, and it can sense light from concentrated sources like laser pointers (although be careful with high-power lasers, as they could damage the sensor). It will also have a very muted response to IR light that is close to the visible spectrum (700-800nm). The 1127 is non-ratiometric which means that you cannot rely on the sensor saturating at 5 volts. To be conservative, interpret a sensor voltage of over 4.75V as saturated, with the true light level being unknown.
The 1127 uses the AMS104 light sensor package. The following graph illustrates the sensor's sensitivity to specific wavelengths of light.
The Phidget libraries automatically convert voltage to illuminance (lux). See the Phidget22 API for more details. The formula to translate voltage from the sensor into illuminance is:
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 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|
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.