Does the quadrature decoder of nRF51 supports AEDR-8300 encoder?

[wyn]

Hello,

I am new on nRF51 and i would like to have a function to read the rotary position of motor in any rotary direction by adding a codewheel and a two channel reflective optical encoder, like AEDR-8300. The output of the two channels forms four phases with 90 degree shift per each phase, see page 3 of the document below for the waveform, when motor rotates in one direction the position reading is increased and the reading is decreased if the motor rotates in opposite direction . Does the quadrature decoder of nRF51 accept this waveform?

www.jameco.com/.../1548289.pdf

Thanks, wyn

[Sigurd]

Hi,

I don't think that should be any problem. It uses a standard 90 degree state width, so the waveform should be supported.

[Sigurd]

Yes, the LED pin on the QDEC is used to control(turn off/on) the LED on the AEDR-8300 in order to keep the power levels to a minimum. On this infocenter link you can read more about it:

"The LED output follows the sample period, and the LED is switched on a given period before sampling and switched off immediately after the inputs are sampled. The period the LED is switched on before sampling is given in the LEDPRE register."