From NURDspace
Participants User:buzz
Skills Instrumentbuilding
Status Finished
Niche Music
Purpose Instrument
Tool No
Tool category


buztrum-v5-pic1.png {{#if:No | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:No | [[Tool Cost::{{{Cost}}} | }}

So, i wanna clone a 'le strum'

Build Log

OK, going to try and hook it up as well as possible and figure out software later i guess.

relevant atmega32u4 pins ;

mpr121 - atmega32u4 

sda - 2
scl - 3
irq - 7

shift register & columns

col0 (purple) - 10
col1 (green) - 16
col2 (orange) - 14

latch (grey) - 15
data (blue) - 18
clock (yellow) - 19

--buZz (talk) 20:58, 27 June 2023 (CEST)

I bricked it, time for a rebuild/upgrade \o/

Got a atmega32u4 board, cut out the old arduino.

Shift register
 Latch   Grey
 Data    Blue
 Clock   Yellow
MPR121 breakout
  SDA Brown
  SCK Black
  IRQ White
  0 Purple
  1 Green
  2 Orange

--buZz (talk) 17:19, 20 August 2021 (CEST)

YES, Time for initial release!!

--buZz (talk) 01:44, 11 April 2016 (CEST)

Woot, electronics done (i think!) time to verify and start on firmware :)

--buZz (talk) 00:44, 10 April 2016 (CEST)

Finally got round to printing the last pieces \o/ Time to start on connecting everything together :D

--buZz (talk) 09:09, 9 April 2016 (CEST)

Getting ready to continue on more of all this next weekend (nurd-inn woooot).

--buZz (talk) 15:18, 31 March 2016 (CEST)

Seems to work well!

--buZz (talk) 04:44, 26 March 2016 (CET)

Worked on the buttonmount for the last couple days, kinda getting towards ready with it :)

--buZz (talk) 03:08, 25 March 2016 (CET)


Current 'plan' , port logic of lestrum to arduino , implement a capacitive touch sensor for strumming, implement something with 74hc595 to scan all the switches, combine with axoloti inside instrument? Maybe some knobs and leds and display(s) on the axoloti? hmm

I got buttons from KingOfDos, the nice keys also used on Wearable Computer 's current keyboard

Still need to decide on the form factor ... guitarshape seems logical, but maybe something else?

Got parts

  • PIC16F1825 ( Might not be using these ... )
  • Midi connector(s)
  • 74HC595
  • 2x Adafruit MPR121 capacitive touch breakouts (ordered 2016-03-11)
  • Axoloti (unplanned extra)