Dotty: 1.4 Overview, Features, BOM

With version 1.4 I have a working prototype with a panel. These make mounting it in a case possible. There are still some minor issues I want to fix before releasing it to the public. I build Dotty so I know what to expect. But I would be nice to have some feedback.

This topic is mainly for those whom received or are going to receive a 1.4 prototype version. I hope It helps with the build and explain some of the features. If you haven’t received a Dotty but curious on what it can do, keep on reading.


Dotty is a trigger sequencer. When I made Dotty I wanted control over my drum sounds. Dotty is going to be the drummer controlling the drums in my rack. I can control other things too. It outputs triggers on 8 channels/tracks. Short pulses of 5 volts, currently it is set to 4ms pulses.

I wanted more control over drums in a live situation. The selected track is programmable with 16 buttons. One tracks has 16 steps, each step controlled by a button. The tracks can be selected with the smaller buttons. There are some extra buttons that will give some more control in a live setup. Like recording a step or filling the drum for a drum-roll.

From a builders point of view it needed to be easy build, keeping cost low and no smd.


  • 8 Track trigger sequencer
  • 16 Banks of 8 tracks
  • 16 Steps track
  • Each track has two parts (making it 32 steps)
  • Preset tracks with fast loading
  • Save and loading (tracks, banks and settings)
  • Copy and paste functions
  • Internal and external clock
  • Input for reset clock
  • Led Matrix to visualize settings and tracks/steps
  • Clock menu with divider and more
  • 4 FX buttons attachable to functions (not implemented in beta)
    • Reverse
    • 2 step
    • Hold
    • Record Step
    • Fill
    • Fill Randomly
    • More to come..

And more to come

Bill of Materials v1.4

3Led Matrix
J1, J2, J3, J4, J5, J6, J15, J16, J22, LJ12_Out1, LJ56_Out1111×4 Pin headers (male)
J10, J11, J12, J13, J14, J23, LJ12_In1, LJ56_In1111×4 Pin headers (female)
J17110 pin IDC (eurorack power)
11Thonkyconn jacks
Q1, Q2, Q332N3904
R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R35, R36, R37, R38, R43, R44,R45, R464010K Resistors
R33, R342100K Resistors
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23, SW24, SW25, SW26, SW27, SW28, SW29, SW30, SW31, SW32, SW33, SW34, SW35, SW3636Buttons
28Button Caps Big
8Button Caps Small
U1, U2, U3, U4474HC4051
V1.5 will add 8 x 1k resitors to protect the 74HC595.

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