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Data logging of rotational encoders

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Data logging of rotational encoders

Postby Javareda » Tue Jun 06, 2017 3:18 pm

I am trying to do two things
1- log data of 7 or 8 rotational encoders simultaneously exemple robot with
2- process the information in real time ; basically some matrix transformation basic calculations inreal time

Can you please advise on the best product and implementation with

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Re: Data logging of rotational encoders

Postby Gerry » Tue Jun 13, 2017 8:51 am

Hi Javareda,

The answer to your query depends upon whether you need higher precision in voltage or higher precision in time.

If your rotational encoders are, for instance, generating pulses, then you will need to find out what the fastest pulse rate is likely to be. You can then multiply that figure by 5 to give you the sample rate that the data logger will need to be capable of (you will have to increase the sample rate accordingly if the duty cycle is less than 50%), if you are going to be measuring the pulse rate to establish the speed, or just counting pulses, over a fixed time frame, to determine angular orientation. If the sample rate required is 1kS/s or less, a PicoLog 1012 (see here: https://www.picotech.com/data-logger/pi ... hannel-daq) would be a good choice of data logger, as it has 12 input channels, and can sample 8 channels at that rate, and will give you a relatively high number of data points over a fixed time-frame, with which to determine angular orientation.

If your rotational encoders give you a more analog type of output for more precise determination of rotational orientation and you need to determine the rotation to within less than 10 1/2 minutes of a degree, and you don't need to sample the data faster than 16.7kS/s, then an ADC-20 (see here: https://www.picotech.com/data-logger/ad ... cquisition) would be a better.

Both of the products mentioned will work with PicoLog data logging software, which you can download from here: https://www.picotech.com/downloads.


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