4 questions about ledrings

cimo · February 15, 2007, 12:19am

hi

i have 4 questions about ledrings, i also have my own opinion but i need to be sure about this:

-i can choose if the a group of DOUT will be triggered either by the corresponding DIN or by an external MIDI input but

what about the ledrings? what s the difference?

-if i have 4 ledrings on my MB but i ve soldered only one of them.. will it work without the rest of them soldered to the pcb?

-how will i (and is there any need to) instruct the software about how many leds i use per ledring?

-will a working ledring improve my karma?

thanks in advance

simone

cimo · February 15, 2007, 2:44am

hey there

i have a fifth question:

the “how to connect 16 LED rings to a DOUT4” example shows how to connect 16 X 11 cathodes to the first 2 shift registers and 11 X 16 anodes to the 3rd and 4th shift registers.

now i have 4 LED rings and i ve connected 4 X 11 cathodes to the 1st SR and 11 x 4 anodes to SR number 2 and number 3

so i used only 3 shift register and here is my main.asm code about the LED rings

#define LEDRINGS_SR_ENC1_16_CATHODES_1	1	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_CATHODES_2	0	; second shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_1	2	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_2	3	; second shift register with anodes of the first 16 LED rings



#define LEDRINGS_SR_ENC17_32_CATHODES_1	0	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC17_32_CATHODES_2	0	; second shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC17_32_ANODES_1	0	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC17_32_ANODES_2	0	; second shift register with anodes of the first 16 LED rings



#define LEDRINGS_SR_ENC33_48_CATHODES_1	0	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC33_48_CATHODES_2	0	; second shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC33_48_ANODES_1	0	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC33_48_ANODES_2	0	; second shift register with anodes of the first 16 LED rings

;

#define LEDRINGS_SR_ENC49_64_CATHODES_1	0	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC49_64_CATHODES_2	0	; second register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC49_64_ANODES_1	0	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC49_64_ANODES_2	0	; second shift register with anodes of the first 16 LED rings

will that work? i prototyped a custom dout double layer PCB with LED rings on it and i can t be sure if fails (cause it doesn t work for the moment) because of software or hardware problems.

thanks

simone

cimo · February 27, 2007, 12:43am

hallo

i ve found this only solution:

SR 1 2 and 3 are connected to the ledrings, while SR 4 to the buttons

if i cut the traces on the pcb and solder 2 cables/bridges i can change it like this: SR 1 3 and 4 to the ledrings and SR 2 to the buttons.In this way the ledrings will be connected as in the original MB64e except for the SR 2 which should be connected to ledrings 9-16.

Since i am going to do a “dirty” job on the pcb i d like to receive some comment or advice before going on, thanks

hasn t anybody used less than 9 ledrings on a MB64e project with only 3 SRs ?

simone

cimo · March 2, 2007, 3:59pm

… crazy people talk to themselves !!!

anyway i tried to write the code as follow

#define LEDRINGS_SR_ENC1_16_CATHODES_1	1	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_CATHODES_2	1	; second shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_1	2	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_2	3	; second shift register with anodes of the first 16 LED rings

in this case all the leds will light up while with code like this

#define LEDRINGS_SR_ENC1_16_CATHODES_1	1	; first shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_CATHODES_2	0	; second shift register with cathodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_1	2	; first shift register with anodes of the first 16 LED rings

#define LEDRINGS_SR_ENC1_16_ANODES_2	3	; second shift register with anodes of the first 16 LED rings

no led will light up

i have to admit i am completely lost and dunno if i have to modify the mb64e_ledrings.inc and that scares me cause i can t understand a line in it!!

still hoping and waiting for some help..

thanks in advance

simone

cimo · March 2, 2007, 4:06pm

hurra for the crazy people!!!

it worked this way:

i deleted all the references to cathodes 2 (2_1) in mb64e_ledrings.inc and main.asm

if you need it write me and i can be more specific about what i deleted

simone

cimo · March 5, 2007, 10:23pm

.. debugging time ..

so far led ring #1 will work ok but the other 3 shows problems: leds not so bright or getting darker o brighter as there are more or less leds on.

If i use the dout_enc example i can see that all leds on position number 2,7,8,9,11 (on the four led rings) are not working while the rest works ok.

I searched for bad solder joints, vias etc but i can t figure out what s wrong.

I tried to apply some current to the not-working leds and they didn t light up unless i desoldered them from the pcb, that sounds like a shortcut! is it possible that the SRs are shortcutting the cathodes?

My question is, being the first time i work with led rings: what is the best way to debug led rings trouble? any idea?

thanks

simone

cimo · March 6, 2007, 1:28am

… damned defective leds (square 2mm blue leds from conrad, 3 defective over 50)

i hope it will be of help for somebody in the future, a defective led can shortcut (even partially)

simone

Sasha · March 6, 2007, 8:24am

Simone, I learned you have test all you can before soldering. I am buying parts in big local store but one time they sold me few nonworking pushbutons. They felt OK, but make connection only if you press them really hard. I found that after I solder them onto PCB.

So, no matter is it Conrad or some other reseller you cant be sure parts are OK unless you test them. I dont belive that case is for all electronics, but can be case for cheap pasive/mechanical parts.

cimo · March 9, 2007, 3:19pm

hi

so now all the ledrings are working and i can trigger them if i send some MIDI from MiosStudio for example .. but only 2 of the encoders are actually triggering 2 ledrings while the other 2 ledrings are triggered by other MIDI event.Now if i try to change the MIDI CC of the encoders to match the MIDI CC that triggers the ledrings it won t work anyway because also the MIDI CC of theledrigns will change.. ???

how am i supposed to fix this? why the first (and only) 4 encoders are not related to the first (and only) 4 ledrings? any idea?

thanks

simone

cimo · March 9, 2007, 5:37pm

hi

i remember now that the pins of DIN SRs were not directly related to the DOUT SRs .. i mean that you can “say” to MIOS that the DIN SR #1 is related to the DOUT SR #3 (for example) but that doesn t mean that pin #6 and #7 of the DIN SR #1 are related to pin #6 and #7 of the DOUT SR #3.. as far as i remember it was something like

DIN - DOUT

0 - 0

1 - 1

2 - 2

3 - 3

4 - 7

5 - 6

6 - 5

7 - 4

still i am not sure if this was the case and also if this can be the cause of my troubles!

to be more precise i have 4 encoders connected to the DIN SR #1 but only the 2 encoders conencted to pins # 4,5 and 6,7 are triggering 2 ledrings while the other 2 encoders connected to pins #0,1 and 2,3 are working properly but not triggering ledrings, i can say that all ledrings are working ok because i can trigger them from an external MIDI input..

simone

MRE · March 10, 2007, 3:17pm

I admit I didnt read that all the way through,

but it was very ENTERTAINING!

Good luck with the padded walls simone, they are comming to take you away!

Thanks for documenting your progress for everyone else.

cimo · March 12, 2007, 4:46pm

MRE we need to laugh a little when hard times come … better than making hara-kiri with a 30 watts Weller iron..

so i ve found the little bug and … surprise surprise … the error was mine: somehow the cathodes lines were connected to D2 D3 D4 D5 instead of D0 D1 D2 D3 so (since i had 4 pins of the DIN SR#3 free, without use) i decided to use encoders on DIN SR1 pins 4,5,6,7 and DIN SR2 0,1,2,3 leaving DIN SR1 pins 0,1,2,3 free.

pics soon

simone