June 17, 2014
Gray code was named for Frank Gray, a Bell labs researcher, who patented the procession in 1953, even though a form of it was used by Emile Baudot for telegraphy as early as 1878. The most important thing to understand about Gray code is that only one bit changes from...
May 6, 2014
How to Build a Portable Incremental Encoder Tester Every once in while, it’s nice to have a handheld device that can be used to see quickly if encoder signals are present. I designed and built a quick-tester that allows for fast interface to an encoder without having to drag out...
April 27, 2014
. I have interfaced a 200 line count QR145 optical encoder to a DL06 PLC. The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...
April 23, 2014
I have interfaced a 200 LC QR145 to a DL06 PLC to show how to convert from a line count to mechanical degrees. This type of conversion may be useful for any application of optical encoder to measure angles. To calculate a degree measurement we divide 360 by the line...
March 26, 2014
While most of us are familiar with how to measure something in mechanical degrees, incremental 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 electrical...
February 22, 2014
An optical quadrature encoder is an incremental encoder with outputs consisting of two incremental channels that are out of phase by 90 electrical degrees. In each part of the encoder cycle, the two signals are in unique positions relative to each other. By comparing the difference between the high and...
November 20, 2013
The QDH20 Industrial Rotary Encoder 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...
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...
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