*BUILD LOG* 'CDJ 2000'-style DIY Traktor controller

[Greg5OH]

LMK if you ever want to sell me one of these!

[Elda83]

Thanks.
I love this forum.

[DjNecro]

This code will work fine for scanning switches or pots but to multiplex LEDs I find its not quite quick enough and they flicker a bit. I use a more advanced technique for switching the control inputs called port manipulation...

http://www.arduino.cc/en/Reference/PortManipulation

Mmmmmm port manipulation... *drool* You can call me Mr. Bit Twiddler

On a serious note though... Direct port access would be pretty much required for any serious project. There's just so much overhead involved when using digitalwrite/read that there's really not much that can be done to speed things up past a certain point.

It can be tricky to wrap your mind around

[Siytek]

Mmmmmm port manipulation... *drool* You can call me Mr. Bit Twiddler

On a serious note though... Direct port access would be pretty much required for any serious project. There's just so much overhead involved when using digitalwrite/read that there's really not much that can be done to speed things up past a certain point.

It can be tricky to wrap your mind around

Yeh your totally right about the usage to run a digital write command, I found this page where this guy had tested the difference between digitalwrite and port manipulation and found port manipulation to be 10 times faster, he also explains how to do it...

http://www.instructables.com/id/Ardu...how-to-fix-it/

Here is the bit of code I use for MUXing, I replaced the code in my last post with this to get things up to speed for multiplexing my LED VU meter, the code is also shorter and 'nice to look at' ...

void multiplex(byte mp_number_man){
  
 byte port_b_out[8] = { 0x0, 0x8, 0x4, 0xC, 0x2, 0xA, 0x6, 0xE };
 PORTB = port_b_out[mp_number_man]; 
  
} 

This code is quite specific to the pin numbers the MUX control lines are connected to on the Arduino. Both the hex values and 'PORTB' need to be set correctly (the link above explains pretty well). This particular code however, should work if the A,B,C control inputs on the MUX are connected to Arduino pins 11, 10, 9

[DjNecro]

Yeh your totally right about the usage to run a digital write command, I found this page where this guy had tested the difference between digitalwrite and port manipulation and found port manipulation to be 10 times faster, he also explains how to do it...

http://www.instructables.com/id/Ardu...how-to-fix-it/

Here is the bit of code I use for MUXing, I replaced the code in my last post with this to get things up to speed for multiplexing my LED VU meter, the code is also shorter and 'nice to look at' ...

void multiplex(byte mp_number_man){
  
 byte port_b_out[8] = { 0x0, 0x8, 0x4, 0xC, 0x2, 0xA, 0x6, 0xE };
 PORTB = port_b_out[mp_number_man]; 
  
} 

This code is quite specific to the pin numbers the MUX control lines are connected to on the Arduino. Both the hex values and 'PORTB' need to be set correctly (the link above explains pretty well). This particular code however, should work if the A,B,C control inputs on the MUX are connected to Arduino pins 11, 10, 9

Or when A/B/C are connected to 8/9/10 you can do:

void multiplex(byte mp_number_man) {
  PORTB = mp_number_man;   
}

If you look at the datasheet, you'll notice that the addresses for the 4051's inputs are their binary value on the a/b/c pins... so you can set the port value to equal the input that you want.

[MiL0]

http://www.youtube.com/watch?v=8a7NU98fSMI

Small update - slow and steady...

[marTTyn]

Any updates?

[MiL0]

yes, a little... but I want to make some solid progress first before I update this thread.

should have something substantial to show in the next month or so

[chrisw]

yes, a little... but I want to make some solid progress first before I update this thread.

should have something substantial to show in the next month or so

Milo the program change button on the side, and the first pads in the first and second row become a pitch change up and pitch change down if used in ableton.


Also couldnt u have used endless rotary encoders or endless pots?

[MiL0]

chrisw - you've lost me! what are you referring to?