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Recent Forum Posts

Re: Can PBP read optical encoder damn fast? :)

If I get it right, you will use a PIC to read a quadrature encoder, then communicate with I2C to another PIC and the second PIC will send the data to your DDS?

Does this sound logical and...
Ioannis Yesterday, 21:07

Re: Can PBP read optical encoder damn fast? :)

I've found this: https://hackaday.io/project/122039-i2c-encoder-v2 - Ready firmware for the above mentioned PIC with I2C output. So what if I use this chip with that firmware to get data from...
CuriousOne Yesterday, 20:23

Re: Can PBP read optical encoder damn fast? :)

As said above, there will be no LCDOUT or any other statements in the loop, except DDS updating. Regarding the precision, have not decided it yet, because have not build and have not heard :D maybe...
CuriousOne Yesterday, 19:43

Re: Can PBP read optical encoder damn fast? :)

If the encoder strip has 60 lines per cm then you can get a resolution of 240 counts per cm by counting all four edges of the quadrature cycle.

If you're OK with 60 it makes it a lot easier...
HenrikOlsson Yesterday, 18:46

Re: Can PBP read optical encoder damn fast? :)

ISR then.

Ioannis
Ioannis Yesterday, 13:42

Re: Can PBP read optical encoder damn fast? :)

I don't see how to avoid use of pause statement. We have time changing, things are happening within time, so how not to consider time? In final device, there will be no LCDOUT, if that is the problem.
CuriousOne Yesterday, 13:34

Re: Can PBP read optical encoder damn fast? :)

Well, your LCD may be slowing down the response. And since you use PAUSE and LCDOUT it is expected that program is not the most efficient. The encoder is best done in ISR and even better using...
Ioannis Yesterday, 13:12

Re: Can PBP read optical encoder damn fast? :)

What stops you from writing directly to the registers?

Ioannis
Ioannis Yesterday, 13:05

Re: Can PBP read optical encoder damn fast? :)

This is simple 3 pin incremental encoder, middle pin is tied to VCC, A and B are tied to PORTB.3 PORTB.4, which are also pull down with 10K resistors. If I rotate shaft slowly, then no false...
CuriousOne Yesterday, 12:41

Re: Can PBP read optical encoder damn fast? :)

I've modified my code and it works ok, but sometimes I get false readings too - say for 20 pulses of CW, I will have 2-3 pulses of CCW and vise versa

STATE: 'WAIT FOR ENCODER TO BE MOVED...
CuriousOne Yesterday, 12:39

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