The Voltage Sensor measures the differential voltage between the input terminals and outputs the difference proportionally. The maximum differential voltage that can be measured accurately is ±30V.
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.
|Image||Part Number||Price||Cable Length|
You can protect your board from dust and debris by purchasing an enclosure. An enclosure will also prevent unintentional shorts caused by objects touching the pins on the bottom of the board or any terminal screws.
Welcome to the 1132 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 1135!
In order to demonstrate the functionality of the 1135, 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 1135.
After plugging in the 1135 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 1135 measures the differential voltage between the input terminals and outputs the difference proportionally. The maximum differential voltage that can be measured accurately is ±30V. When the positive and negative inputs are equal, the voltage output value is 2.5V. When the positive input is 30V greater than the negative input, the voltage output is 4.5V and when the positive input is 30V less than the negative input, the voltage output is 0.5V.
Since the 1135 can measure a differential voltage, the common mode rejection (CMR) is an important specification. CMR refers to the amount of voltage that both input terminals of a differential amplifier can be offset without affecting the output gain. For example, if the positive terminal sees a voltage of 7V and the negative terminal sees a voltage of 5V, then the CMR would be 5V and would output a value of 2V at unity gain. For the 1135, it is able to measure the differential voltage of ±10V with a CMR of 40V while keeping the accuracy within 2%. Please note that the error specifications do not include the error introduced by the Analog to Digital Conversion on the Analog Input. (if you are using the 1135 with a PhidgetInterfaceKit) The majority of error introduced by the Analog to Digital conversion is from the error in the voltage reference (0.5% max), and the limitation of resolution in the analog-to-digital converter. The best accuracy can be achieved by using a 2 or more point calibration of your system - effectively calibrating the 1135 and the PhidgetInterfaceKit in a single step. If you are calibrating, be sure to use a good quality multimeter to determine the voltage being applied.
The Phidget libraries can automatically convert sensor voltage into differential voltage (V) by selecting the appropriate
SensorType. See the Phidget22 API for more details. The Formula to translate the analog voltage returned by the 1135 into differential voltage is:
where Vdiff is defined as Vpositive - Vnegative, and Vsens is the voltage returned by the 1135. For maximum accuracy, measure the sensor voltage when measuring a 0V source and replace the "2.5" in this equation with the zero value that you've measured.
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 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.
|Sensor Type||Voltage (DC)|
|Controlled By||Voltage Input (0-5V)|
|Sensor Output Type||Non-Ratiometric|
|Voltage Difference Max||± 30 V DC|
|Relative Input Voltage Max||± 40 V DC|
|Measurement Error Max||0.5 %|
|Sensor Response Time Max||10 ms|
|Voltage Offset Max||± 100 mV DC|
|Supply Voltage||5 V DC|
|Current Consumption Max||3.6 mA|
|Sensor Input Impedance||1 MΩ|
|Output Voltage Min||0 V DC|
|Output Voltage Max||5 V DC|
|Recommended Wire Size||16 - 26 AWG|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|March 2010||0||N/A||Product Release|
|Product||Voltage Sensor||Sensor Properties|
|Image||Part Number||Price||Voltage Difference Max||Input Voltage Min (DC)||Input Voltage Max (DC)|
|1135_0||$19.00||± 30 V DC||—||—|
|1135_0B||$17.00||± 30 V DC||—||—|
|3509_1||$115.00||—||0 V DC||200 V DC|
|VCP1000_0||$50.00||± 40 V DC||—||—|
|VCP1001_0||$25.00||± 40 V DC||—||—|
|VCP1002_0||$25.00||± 1 V DC||—||—|