Products for USB Sensing and Control

Products for USB Sensing and Control

PhidgetEncoder HighSpeed 4-Input

ID: 1047_0
Read up to four encoders simultaneously with this Encoder Interface. You can read limit switches or other simple sensors with the digital inputs.

Replaced by 1047_1B

Replaced by the 1047_1 - PhidgetEncoder HighSpeed 4-Input.

The PhidgetEncoder Highspeed 4-Input can be used with a wide assortment of mechanical and optical encoders. The encoder should be of quadrature output type, indicating that there will be two quadrature output channels (usually labeled A and B) and a third output channel (only on some encoders) to signal when the index pin (a reference point for zero position or a complete revolution) has been reached.

The PhidgetEncoder Highspeed 4-Input is able to read four encoders simultaneously. Encoders are not powered up until all initialization of the device is complete. It is possible to enable some or all encoders, depending on how many of the channels are being used. This can also be used to reduce power consumption when certain encoders are not needed.

The PhidgetEncoder Highspeed 4-Input has the added ability to time the duration between a group of quadrature changes. The time is returned in microseconds. This time value can be used to calculate velocity and acceleration.

Both mechanical and optical encoders are available, with optical encoders dominating at > 100 counts per second. Review the data sheet for the encoder you are planning to use to ensure it is compatible with the PhidgetEncoder Highspeed 4-Input. Almost any incremental quadrature encoder will work but it is important to verify this before connecting it to the Phidget. Absolute encoders will not work with this device. Ideally, you should choose a quadrature encoder with a 5-pin output and the following pinout in order to be directly compatible with the 1047.


Comes Packaged with


Warning


warning The 1047 has the ability to power off individual encoders. This feature can be a problem if there is enough capacitance in the encoder to cause a droop in USB voltage when it is turned on. From software, you may notice the 1047 resets when an encoder is enabled.

If this is an issue, connect the Red (+5V) wire from the encoder to the 5V pin on the digital input terminal block. All 4 encoders can be attached to this pin if necessary.

Product Specifications

Encoder Interface
API Object Name Encoder
Number of Encoder Inputs 4
Count Rate Max 250000 pulses/s
Encoder Interface Resolution x4
Update Rate 125 samples/s
Time Resolution 1 μs
Encoder Input Low Voltage Max 1.4 V DC
Encoder Input High Voltage Min 1.8 V DC
Electrical Properties
Encoder Pull-up Resistance 10 kΩ
Current Consumption Max 470 mA
Current Consumption Max (per encoder) 200 mA
Current Consumption Min 30 mA
USB Voltage Min 4.8 V DC
USB Voltage Max 5.3 V DC
Physical Properties
Recommended Wire Size 16 - 26 AWG
Operating Temperature Min 0 °C
Operating Temperature Max 70 °C
Digital Inputs
Number of Digital Inputs 4
Pull-up Resistance 15 kΩ

Software Objects

Device Object Name Channel
Encoder Inputs Encoder 0 - 3
Digital Inputs Encoder 0 - 3

This product has been replaced by a new revision, the 1047_1 - PhidgetEncoder HighSpeed. The new revision has improved power switches for added stability when using high capacitance encoders, and has updated firmware.

If you only need a single encoder, check out the 1057 - PhidgetEncoder HighSpeed.

Enclosure

You can protect your board by purchasing the 3809 - Acrylic Enclosure for the 1047.

Documents

Code Samples

APILanguageOS
Encoder C Multiple Download
Encoder C# Windows Download
Encoder Java Multiple Download
Encoder JavaScript Any Download
Encoder Objective-C macOS Download
Encoder Python Multiple Download
Encoder Visual Basic .NET Windows Download
DigitalInput C Multiple Download
DigitalInput C# Windows Download
DigitalInput Java Multiple Download
DigitalInput JavaScript Any Download
DigitalInput Objective-C macOS Download
DigitalInput Python Multiple Download
DigitalInput Visual Basic .NET Windows Download

Product History

Date Board Revision Device Version Comment
June 2010 0100Product Release
May 2011 0101getLabelString fixed for labels of length >7
January 20120102Fixed initial power state of channels 3 and 4
June 2012 1102Replaced power switches for added stability
March 2015 1103Fixed a timing bug

Getting Started

Welcome to the 1047 user guide! In order to get started, make sure you have the following hardware on hand:


Next, you will need to connect the pieces:

1047 0 Connecting The Hardware.jpg
  1. Connect the encoder to the 1047 Encoder Phidget using one of the included encoder cables (Soldering may be required).
  2. Connect your device to your computer using the USB cable.


Now that you have everything together, let's start using the 1047!

Using the 1047

Phidget Control Panel

In order to demonstrate the functionality of the 1047, the Phidget Control Panel running on a Windows machine will be used.


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 1047.

First Look

After plugging the 1047 into your computer and opening the Phidget Control Panel, you will see something like this:

1047 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.

Encoder

Double-click on the Encoder object, labelled Encoder Input, in order to run the example:

1047 Encoder Example.jpg


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

  • Toggle the Enabled checkbox to enable/disable the 1047.
  • Specify a counts per revolution (CPR) value to enable velocity calculation.
  • Position Change: the number of ticks (or quadrature cycles) that have occurred since the last change event.
  • Time Change: the amount of time in milliseconds that has elapsed since the last change event.
  • Position: the total position in ticks relative to where the encoder was when the window was opened.
  • Index Position: the position where the index channel was last encountered. Some encoders do not support index, check your encoder's datasheet for more information.
  • Velocity: the average velocity in rotations per second. A CPR must be specified to enable this functionality.


Digital Input

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

1047 DigitalInput Example.jpg


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

  • This is an active-low device, therefore, it will be true when connected to ground, and false when connected to a high voltage.

Technical Details

General

The 1047 can be used with a wide assortment of mechanical and optical encoders. The encoder should be of quadrature output type, indicating that there will be two quadrature output channels (usually labeled A and B) and a third output channel (only on some encoders) to signal when the index pin (a reference point for zero position or a complete revolution) has been reached.


The 1047 is able to read four encoders simultaneously. Encoders are not powered up until all initialization of the device is complete. It is possible to enable some or all encoders, depending on how many of the channels are being used. This can also be used to reduce power consumption when certain encoders are not needed.


The 1047 has the added ability to time the duration between a group of quadrature changes. The time is returned in microseconds. This time value can be used to calculate velocity and acceleration with very high precision.


If the number of quadrature counts per revolution is unknown for a particular encoder, this value can be determined by using the index signal. In addition, it is possible to monitor how many counts have occurred since the last index. The index signal is an output only on certain encoders. Refer to the encoder’s description to check if this third output channel exists or not. If the encoder does not have this signal, it is still possible to use it with the 1046, but an event for the index will never get triggered.


The maximum rate of the 1046 is specified at 250,000 quadrature cycles per second. Since this device counts pulses rather than cycles, you could also say that it counts a maximum of 1,000,000 pulses per second (since there are four pulses in a cycle). In your application, these numbers relate directly to the number of revolutions per second you wish to measure, and the number of counts per revolution specified for your encoder. If your encoder's wheel has 1000 counts per revolution, then the limit on measurable revolutions per second is 250, or 15,000 rpm (which, for the 1047, corresponds to 1000 position changes in software per second).


One of the most common problems encountered with connecting encoders to a 1047 is a strange jitter characterized by the encoder position appearing to switch back and forth between 0 and 1 or -1 and nothing else. This is usually indicative of a bad connection on either the A or B channel. You should check that the wiring is sound and try again.

Choosing Encoders

The 1046 incorporates a 10 kOhm pull-up resistor on each line from the encoder input connector. If your encoder is mechanical, these pull-up resistors eliminate the requirement to add your own external pull-up resistors.

Some optical encoders will have a simple photo-transistor/open-collector output. The 10 kOhm pull-up resistor may have to be augmented with a stronger parallel resistor if your optical encoder datasheet calls for it. Some open-collector outputs will not be strong enough to pull this resistor to ground. These encoders are not compatible with the 1047, and may only work initially, or not at all. If you have any doubts, please contact us.


Most optical encoders have a push-pull output, and the pull-up resistor is irrelevant, but weak enough not cause problems.


We have reviewed the following encoders, and found that they can be used with the PhidgetEncoder Highspeed 4-Input. This is not meant to be a comprehensive list but should be used as examples of the type of encoders that can be used with the 1047.


Manufacturer Web Page Part Number
Grayhill www.Grayhill.com Series 63R, Series 61R Series 63Q TTL Output
US Digital (Recommended) www.USDigital.com S4, S5, E2, E3, E4, E4P, etc.
Avago Technologies (Formerly Agilent) www.avagotech.com HEDS 5500
CUI Inc. www.cui.com AMT103-V

Connectors

Each Input uses a 5-pin, 0.100 inch pitch locking connector. The connectors are commonly available - refer to the Table below for manufacturer part numbers.


Manufacturer Part Number Description
Molex 50-57-9405 5 Position Cable Connector
Molex 16-02-0102 Wire Crimp Insert for Cable Connector
Molex 70543-0004 5 Position Vertical PCB Connector
Molex 70553-0004 5 Position Right-Angle PCB Connector (Gold)
Molex 70553-0039 5 Position Right-Angle PCB Connector (Tin)
Molex 15-91-2055 5 Position Right-Angle PCB Connector - Surface Mount


Note: Most of the above components can be bought at Digikey.

Further Reading

If you want to know more about encoders, check out the Encoder Primer. If you'd like to know more about the digital inputs on the 1047, visit the Digital Input Primer.

What to do Next

  • Software Overview - Find your preferred programming language here to learn how to write your own code with Phidgets!
  • General Phidget Programming - Read this general guide to the various aspects of programming with Phidgets. Learn how to log data into a spreadsheet, use Phidgets over the network, and much more.
  • Phidget22 API - The API is a universal library of all functions and definitions for programming with Phidgets. Just select your language and device and it'll give you a complete list of all properties, methods, events, and enumerations that are at your disposal.

Software Objects

Channel NameAPIChannel
Encoder Input Encoder 0 - 3
Digital Input DigitalInput 0 - 3

API


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