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LMNC Big Button Seq build question
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Author LMNC Big Button Seq build question
kragg
Hello
I would like to build the LMNC Big Button Seq, and it looks like a fun module and an easy build, but i have never worked with an Arduino before, so i am not sure how are the cuts on the veroboard are supposed to be done under the arduino chip ?
I understand that i should cut a row (like with an opamp, for instance) so that the current doesn't flow from one side of the chip to the other one, but how should i do with the 3 "vertical" pins (dedicated to power) ?
I guess i need to cut somewhere (it seems to be the J row from column 2 to 14, but after that, i am quite unsure where to make the cut on columns 16,17,18), and there is no picture of the "naked" veroboard (without the Arduino visible) hmmm.....
Could anyone help, please ?

[img]https://static1.squarespace.com/static/5912db7ee6f2e1435dbab4fd/t  /5aa4834871c10b34ddd2437d/1551175386915/BIG+BUTTON?format=1400w[/img]
fg
hello, I think that all the tracks are cut under the arduino,
the regulator 7805 is not necessary, you can directly supply in 12V the arduino card via VIN and use the output VCC 5V for the potentiometers, the button ... (red wires)


I add for inputs trig and clock a zener 5V1 + a 200R resistance in protection because in the state these entries do not seem well protected.
Outputs could be protected in the same way.




To test ?
kragg
Thank you, FQ.
I will take your suggestions into consideratoin thumbs up
Did you build it yourself ?
fg
not yet, but its in my plans!
and it seems to be cool
fg
t'es français ?
kragg
yes smile
fg
info http://pjmnc.free.fr/archives/BIG_BUTTON.zip
kragg
Wonderful ! Merci It's peanut butter jelly time!
fg
forget the pullup story, sorry, not work
fg
i updated the archive with the new schema and the new code
kragg
thank you !
fg
I'm going to test it today, because the schema seems a little curious, 5V buttons seem to me surperflue ... to follow
fg
input pullup is coming back!

i don't understand shift pot, no effect ? but the others functions seems to work.

info http://pjmnc.free.fr/archives/BIG_BUTTON.zip

new schem and code with pullup
kragg
Glad you tried !
"Shift" is supposed to be a shuffle, afaik, but i haven't built it yet.
Can you confirm that i should make cuts in the whole J row (from J2 to J16) ?
fg
i confirm at 100%!
the led btn doens't works too ? don't know why
the fuses of the arduino must be flash too
see the schem
kragg
fg wrote:
i confirm at 100%!

Thank you for the confirmation.

fg wrote:
the led btn doens't works too ? don't know why

Sorry, what do you mean ? That the leds don't work ?


fg wrote:
the fuses of the arduino must be flash too

Il faut flasher les fusibles ? hmmm.....
fg
oui flasher les fusibles, efuse hfuse lfuse with avrdude its easy to do, not to understand.
the btn led A6 not works, suposed to indicate the bank, c'est pas très utile, pardon my french
fg
the led is back !

+ 8/ 12/ 16/ 24/ 32/ steps
- shift pot because that doensn t work for me


i think that all is ok now

http://pjmnc.free.fr/archives/BIG_BUTTON.zip
kragg
Thank you !
Did you actually removed the fill feature from the code (or did you just removed the button from your panel) ?
fg
just the pot
kragg
Thank you.
So you added zener 5V1 + a 200R resistance for protection ?
Would you have a picture ?
I might build it this weekend smile
fg
not with my proto, on breadboard

but i will add zener + resistor for my projet to avoid the electric choc,
10v is not good for the arduino i/o Dead Banana

i probably don't use trig input (for rec) but add the reset input jack

new archive available, the last one i think (hope)

http://pjmnc.free.fr/archives/BIG_BUTTON.zip
joem
kragg wrote:
I understand that i should cut a row (like with an opamp, for instance) so that the current doesn't flow from one side of the chip to the other one, but how should i do with the 3 "vertical" pins (dedicated to power) ?


Not sure if you worked this bit out yet or not, but if you mean the 2x3 pin array at the very right of the arduino in the LMNC stripboard diagram, those pins are on top of the arduino, not under, so they should not connect to the stripboard at all.

That 2x3 pin array is the ICSP header, and it's a way of programming the atmega chip without the USB jack that is often (but not always) on arduinos. I highly recommend looking into how to use it, since ISCP programmers are very cheap on ebay/aliexpress and it's very useful for using atmegas without all the arduino hardware. Some synths and modules that use atmegas are programmed via ISCP, too.
kragg
Oh, thank you, Joem !
I am a total Arduino newbie, so i wasn't aware about that oops
(I received a nice Jasper kit today, so i couldn't wait starting to build it, therefore i haven't started building the LMNC Big Button Sequencer... I may begin tomorrow !)
fg
avrdude with usbtiny isp help here

you can program an arduino as an usbtiny with the example sketch arduinoISP

http://pjmnc.free.fr/files/avrdude_usbtiny.JPG

in FRENCH http://pjmnc.free.fr/files/avrdude_usbtiny_fr.JPG

courage
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