differential quadrature encoder

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Ronny Comyn
Posts: 10
Joined: Thu May 07, 2015 9:08 am

differential quadrature encoder

Post by Ronny Comyn » Tue Apr 12, 2016 8:30 pm

Hi there,

would it be possible to read a differential signal quadrature encoder with RP? I have 5 wires coming from the encoder:
Quad_A_H & Quad_A_L (speed)
Quad_B_H & Quad_B_L (direction)
It's a 4096 ppr (pulses per revolution) and X4 encoding device
Any help is welcome


ps congratulations with your nice product!

Nils Roos
Posts: 1441
Joined: Sat Jun 07, 2014 12:49 pm
Location: Königswinter

Re: differential quadrature encoder

Post by Nils Roos » Wed Apr 13, 2016 9:50 pm

Hi Ronny,

I am not abolutely sure if you can connect differential signals directly to the GPIOs, maybe you need to add a converter to 3.3V logic.

Decoding a quadrature signal into a position value or angular velocity or whatever is no problem at all for the Red Pitaya. It can be done in software if you are looking at ~10000 rpm, or in the FPGA if you want to revolve really fast.

All in a day's work for Bicycle Repair Man

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