max with a rotary encoder

Forum 2005-2010 (read only) Software Interfacing
21

I used exactly that code from RotaryEncoder.h, RotaryEncoder.cpp and the example code from "how to run it" in RotaryEncoderTest.pde. I connected the encoderPins pinA to Arduino pin 3, encoderPins pinB to Arduino pin 4, encoderPushButton to Arduino pin 2 and common to ground, but I couldn't get any output from void loop() in RotaryEncoderTest.pde.

Than i included a Serial.println("Start"); statement in the very beginning of void setup() of RotaryEncoderTest.pde. To verify that the RotaryEncoder object gets created I included a Serial.print("Encoder Object created"); message in RotaryEncoder.cpp, which worked fine. But still I didn't get any message from RotaryEncoderTest.pde.

Please, where is my mistake? :-/

22

gatonero -

Check out Keith Neufeld's 'Quadrature' library. It has solved all my encoder needs. It allows for multiple encoders, works on overflow interrupt, and is easy to send over serial.

Here is his explanation:
http://www.neufeld.newton.ks.us/electronics/?p=248

And here is the library download:
http://www.neufeld.newton.ks.us/electronics/?page_id=249

There are examples, but if you need any more, let me know, and I'll post some code

23

I testes this also before. But with the example code while compiling, I'm getting this error message:

/usr/lib/gcc/avr/4.3.0/../../../../avr/include/stdlib.h:111: error: expected `)' before 'int'

/usr/lib/gcc/avr/4.3.0/../../../../avr/include/stdlib.h:111: error: expected `)' before 'int'

In file included from /home/christoph/bin/arduino-0015/hardware/cores/arduino/WProgram.h:6,

Couldn't determine program size: avr-size: '/tmp/build18656.tmp/quadrature_two_encoders.hex': No such file

24

gatonero -

Oh yeah, I thought Keith was going to update. Some libraries have the same problem in version 0013.

Adding this after all your #include statements should clear up the problem:

#undef int                    
#undef abs
#undef double
#undef float
#undef round
25

Thank You Mark. that works. I will post my further experiences with the arduino-quadratur library.

26

Very strange! Now the sketch gets compiled without any error messages. But like with the library RotaryEnconder no Serial.print() output. the Quadratur library. :o

My environment: Ubuntu 8.10 64bit, Arduino 0015 alpha

27

This code helps me understanding what to do with debouncing.
I've read in the code that internal pull-ups are used for the A, B and switch.
So connecting the common rotary and switch to ground.
I'm just curious why I only see the Sensibility going up, and not down when I push the button. in the script above.

#include "RotaryEncoder.h"

RotaryEncoder rotary(2, 3, 4);

void setup()
{
  Serial.begin(9600);

  rotary.minimum(0);
  rotary.maximum(100);
  rotary.position(20);
}


void loop()
{
  if(rotary.pressed())
  {
    Serial.print("Sensibility: ");
    Serial.print(rotary.position());
    Serial.print("%\n");
    delay(200);
  }
}

serial OUTPUT, turning the rotary CCW and CW
Sensibility: 40%
Sensibility: 46%
Sensibility: 48%
Sensibility: 49%
Sensibility: 50%
Sensibility: 51%
Sensibility: 52%

Also with Keith Neufeld's 'Quadrature' library I only see increments when rotating both ways..
60 0
61 0
62 0
63 0

28

Everything works now. (counting up & down) when I don't use the ethernetshield.
I think the ethernetshield messed the overflow interrupt up or something like it.

Everytime I put the ethernet board on Arduino, the RotaryEncoder only counts up OR down, but not both ways.
What I've understood was "RotaryEncoder.h" is using the timer/counter on port 11.
Port 11 is also in use by the ethernet board.
See also the http://www.arduino.cc/en/Main/ArduinoEthernetShield for the ports in use.

To use the other timer, I've checked the datasheet and so I modified the RotaryEncoder.cpp with the following:
TIMSK1 |= (1 << TOIE1);
ISR(TIMER1_OVF_vect)
Deleted the compiled.o file and uploaded the code to the board.
The modified code works without an ethernet board, but again when I use the ethernet board, it only counts down, not up.
Also some other flickering is noticable in the lights.

Now I'm looking for a way to use the ethernet controller and the rotary library. I hope this is technically possible.
but I'm a bit lost now. :-/

Anyone?

Food to read:
https://web.archive.org/web/20210413164913/https://www.uchobby.com/index.php/2007/11/24/arduino-interrupts/

29

Sooooowwwwww,
Ok, don't mention the time I wrote this.
I just gave myself some food to read in my previous post, and came up with the idea to exchange the ports 3 & 4 with port 7 and 8.
This solved my problems for the rotary encoder.
I think I now can use the ethernetboard AND the rotary encoder.

  • Timer0 (System timing, PWM 5 and 6)
    Used to keep track of the time the program has been running. The millis() function to return the number of milliseconds since the program started using a global incremented in the timer 0 ISR. Timer 0 is also used for PWM outputs on digital pins 5 and 6.

  • Timer1 (PWM 9 and 10)
    Used to drive PWM outputs for digital pins 9 and 10.

  • Timer2 (PWM 3 and 11)
    Used to drive PWM outputs for digital pins 3 and 11.

And also that my rotary was only counting one way (pin 4, and not 3 who allready was in use).

I slowly begin to understand how to define and the differences the interrupts have, I realy would like to understand more of it.

30

Did someone try the Sunny's library with a 3bit Gray Code encoder?

I'd like to get result with a TW-700198
from sparkfun.com/datasheets/Components/TW-700198.pdf

:-/

31

Reading your pdf, it looks like a "normal" rotary-encoder to me.
I'm using sunny's library, which works great to define the upper and lower values. The only thing I miss, is to define an option to choose your own multiplier, so it won't in/de-crement with 1, but 5 for example.

In my program, hue and brightness are both from 0 - 255
I want to slowly choose a hue colour, but go 10 times faster with brightness.
I can only change the code now manually, but I want to feed the library with my variable input. I'm not a good programmer and need some help with coding a library with external input.

32

Reading your pdf, it looks like a "normal" rotary-encoder to me.

Yes it is...
It's working.
Thanks Boomy.

33

Thanks to Sunbox for the Rotary Encoder Library. For the cheapo mechanical encoders, this is the only one that I have had much luck with..