#59

Tehn, can this design be adapted for a multiplexer so that I can add an extra 21 knobs?

#60

likely but you’ll need to revise the circuit, and the code. would you like the eagle files?

#61

Thank you Tehn. I have the eagle files and I am trying to weigh up the pros and cons of redoing the PCB and rewriting the sketch or make a couple of small PCBs and use a USB hub. What do you think?

#62

it depends on your comfort with (enthusiasm for) electronic design. this is a really good starter project in general.

multiplexer, use some 4051 chips. each has 8 inputs. connect one 4051 output to an single ADC input.

so, to do 64 analog inputs, you’d use 8 ADC channels.

three digital outs select which 4051 pin to read (all the 4051 chips). so you can “scan” pin 1 of all of the chips, then switch to pin 2, 3, 4…

the code will be pretty simple.

what form factor are you looking at?

#63

I just need to double the number of knobs and rearrange the layout. and add some pushbutton control for mute/unmute latch type things in whatever DAW I end up using (currently non but it changes…) I looked at things like Livid Brain but its actually a lot more then I need… and quite $pendy too.

Might also add some LED underlighting (not actually responsive to presses etc but colour coded for ease of memory) and easy to see as I like to work in pitch black

#64

again this all seems like a great circuit project if you’re interested to learn it. i can post tips here, but mainly you’ll need to learn eagle (i don’t recall you mentioning if you have already)

#65

i still have two unpopulated PCBs if anyone wants them.

paid $80 each.

also if anyone wants to get these direct from osh in the future:

Order from OSH Park

2 Likes
#66

I have eagle, and taught myself how to use it – needs upgrading but I can use it. I may just post progress as I used to do. Hmmm.

#67

Are there still PCB’s for this? @tehn should I PM you if so? Lovely project

#68

i have some PCBs, but i’m out until august 7. catch me then.

1 Like
#69

Actually I might need one too but I’m not sure at all I could build it, having 0 experience in thus sort of things (wantinf to try though). how much would it cost to buy the knobs and the enclosure?

#70

@Oootini did you get these made? Any chance you have a spare PCB you are willing to sell?

#71

necro-bump. cleaning studio, found 2x pcbs. $40 shipped in the US. cost $80 from osh!

#72

I’ll would possibly take one! How much would uk shipping be?

#73

twleve us dollars for intl ship

#74

shall I pm you? lets do it :smiley:

#75

I have sent you a PM about this, thanks

#76

I’ll take the other one. I have an arc on order so it can just be thrown in with that. If that’s cool then let me know how to $$ this.

#77

done then, the pcbs are now gone

#78

Hey, Quick one, would a teensy 3.2 work with the pcbs? I can get one of these in the same order as some pot’s and knobs, at a really good price, or would this fundamentally break anything?
Thanks