Hi every one I have some trouble in my rotary encoder project
encoder is incremental type with A B phase 360 P/R
A phase Ext interrupt
B phase Ext interrupt
So I can judge it is CCW or CW (4 different state)
when the speed is low it seems OK , but when speed increase Arduino fail.
Interrupt to fast??
I have no ideal how to fix this.
"Fail"? What do you mean "fail"? You need to be more specific.
Many encoders are simple mechanical switches. They can have 'bounce' which means you need to apply debouncing. I recently had to add some 0.1uF capacitors to an encoder circuit to eliminate this problem.
when the speed is low it seems OK , but when speed increase Arduino fail.
First, answer MorganS's question "What do you mean fail"?
And then, I have some more:
Does 360P/R mean your total encoder count per revolution is 360 or is it 4x360 = 1440 when counting full quadrature.
At what rpm does it "fail"?
Do you have pullup resistors on the A/B lines?
If your encoder is truely running faster than the interrupts can handle, you can modify the algorithm to read less than full quadrature.
It seems to me that your title should say "Are Arduino interrupts too slow?"
Post your code.
And please use the code button </> so your code looks like this and is easy to copy to a text editor
...R