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+--- Thread: Would this rotary encoder work with a glass-scale board? (/showthread.php?tid=586)
Would this rotary encoder work with a glass-scale board? - MidniteMachinist - 07-14-2020
Apologies... I know enough about electronics to get myself into trouble, but not back out again. Would this encoder work with a TouchDRO board for glass scales? And if so, am I correct in assuming that it would actually have 14400 PPR (quadrature)? Would I need to add pull-up resistors?
Encoder in question here
RE: Would this rotary encoder work with a glass-scale board? - Yuriy - 07-14-2020
It looks like it will work. You won't get 14400 PPR (technically speaking) but that will be the resolution.
It will require a pull-up resistor, since the encoder is NPN.
Regards
Yuriy
RE: Would this rotary encoder work with a glass-scale board? - MidniteMachinist - 07-14-2020
Thanks, Yuriy.
So I need to add a 2k resistor from Vcc to each of the A and B outputs, correct? What about the complimentary (A- and B-) outputs? -
RE: Would this rotary encoder work with a glass-scale board? - Yuriy - 07-15-2020
Modern 5V encoders use positive signal on both lines (primary and complementary), so you'd want pull-up resistors on both sets. The board comes will pull-down resistors installed, but if you give me some heads-up I can order one without those resistors.
I'd use something around 50K for pull-up resistors in that case. If you use 2k with the 47K that come on the board, that would still work, but it just add "chaos factor".
Regards
Yuriy
RE: Would this rotary encoder work with a glass-scale board? - MidniteMachinist - 07-15-2020
50k on both sets it is, then. This is for an existing setup... So no special orders necessary. Just adding a rotary table readout for the W axis on my mill.
Thanks again for the help.