April 15, 2014
I set up a QR145 optical encoder on a Direct Logic DL06 PLC with some simple ladder logic to determine direction based on the A and B incremental inputs. below is a video of the optical encoder in action: In the PLC I used (DL06), the inputs are filtered, which...
March 26, 2014
While most of us are familiar with how to measure something in mechanical degrees, incremental optical encoder signals are measured in electrical degrees. 360 electrical degrees is the period in which a signal completes one high to low transition. This can be in any sort of waveform, but for encoders...
February 22, 2014
What is the purpose of an Optical Quadrature Encoder on the back of a motor? Incremental Optical Encoders will often provide commutation “Hall signals” for timing of the BLDC windings, but I am going to forgo that discussion and turn instead to the Incremental Encoder channels, specifically A and B...
November 20, 2013
The QDH20 is an IP66 sealed encoder made for the rugged duty of an industrial application. Due to the huge array of configuration options, this optical encoder has over 200,000 possible ways that it can be configured. While this is certainly an advantage to an end user that may be...
September 14, 2013
A standard edge sensing scheme for optical rotary encoders is to square up the raw analog sine wave by comparing it against a given voltage. If your analog signal has a 2Vpp amplitude, the value at which you switch off of, creating the edges of your square waves, could be...
August 13, 2013
Below is an e-mail response I sent to someone who was asking about how to calculate the sampling rate they needed to 4X encoder signals. 4Xing or “Post Quad” is a way to use the fundamental A and B encoder pulses to get a higher line count. I wasn’t sure...
June 10, 2013
Since most electronics are set up to have high input impedance, in some situations the addition of a loading or “termination” resistor can help to reduce interference from electrical noise. This can be of particular help when implementing an incremental encoder where there is a long cable run. If the...
May 13, 2013
. If you search the web for a rotary encoder tutorial on incremental encoder construction, the simplest two channel A & B style encoders talk about a light source and a single photo receptive element for each channel. The light beam of this optical pair is then interrupted by the...
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