2 layers90 × 140 mm
Drumkid
mattybrad/drumkid
Version 4 was the first successful working design, with full code, schematics, Gerbers, etc available on GitHub.
69 parts137
2 layers90 × 140 mm
Drumkid
mattybrad/drumkid137Version 4 was the first successful working design, with full code, schematics, Gerbers, etc available on GitHub.
- Size
- 90 × 140 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 61
- Pads
- 225
- Tracks, vias
- 416, 11
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 17 Mar 2019
- Updated
- 27 Mar 2025
Overview
Drumkid is an open-source printed circuit board by mattybrad, from the mattybrad/drumkid repository on GitHub. It is a 2-layer board of 90 × 140 mm with 70 parts on 61 nets, routed with 416 tracks and 11 vias.
It is built around the ATMEGA328P-PU and LM386. Its parts include 19 resistors, 11 capacitors, 8 connectors, 7 diodes and 7 switches. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
README
readme.mdDrumKid
Lo-fi aleatoric Arduino drum machine
Concept
A drum machine which generates rhythms using probability. Imagine a traditional step-based drum machine, but where various dice are rolled for each step, with the resulting numbers used to determine the behaviour of the beat.
Buy Drumkid
You can buy Drumkid fully assembled or as a kit from <mattbradshawdesign.com>
Setup
DrumKid is based around an Arduino Nano, and coded using the Arduino IDE. Audio is produced by the Mozzi library. You can build a version of DrumKid using an Arduino, a breadboard, and standard electronic components, or you can build/buy the "full" version described below.
Design
DrumKid is a portable, handheld, battery-powered instrument with a minimalist design. It consists of a PCB (printed circuit board) for the front panel, featuring knobs, buttons, LEDs, a power switch and a headphone/line output. The electronics are protected/enclosed by two laser-cut acrylic pieces and six metal standoffs.
Open Source
This project is almost entirely open source. The code, breadboard layout, schematics, Gerber (PCB) files, and laser-cutter files are all included in the repository, with the aim of making this project easy to duplicate and adapt. Please note that the project depends on the Mozzi library, which is released under a Creative Commons non-commercial licence. I have used it here with kind permission from its creator, but please be aware that if you create a commercial product using this code, you will need to request permission from him. Go to https://sensorium.github.io/Mozzi/ for more details.
Versions
Versions 1-3 were early prototypes.
Version 4 was the first successful working design, with full code, schematics, Gerbers, etc available on GitHub.
Version 5 contained various PCB errors and has been superseded.
Versions 6 onwards were used in the final product, with version 10 being the latest at the time of writing.
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 220 | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3, R4, R5, R6, R7, R10, R14, R16, R18, R19 |
| 8 | MountingHole | drumkidcustom:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6, H7, H8 |
| 6 | LED | drumkidcustom:LED_D5.0mm | D2, D3, D4, D5, D6, D7 |
| 6 | SW_Push | drumkidcustom:SW_PUSH-12mm_Wuerth-430476085716 | SW2, SW3, SW4, SW5, SW6, SW7 |
| 4 | R_POT | drumkidcustom:Potentiometer_Alps_RK09K_Single_Vertical | RV2, RV3, RV4, RV5 |
| 3 | 100nF | drumkidcustom:C_Disc_D3.4mm_W2.1mm_P2.50mm | C4, C16, C18 |
| 3 | 220nF | drumkidcustom:C_Disc_D3.4mm_W2.1mm_P2.50mm | C1, C2, C7 |
| 2 | 10k | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R15 |
| 2 | 22pF | drumkidcustom:C_Disc_D3.4mm_W2.1mm_P2.50mm | C5, C6 |
| 2 | 680 | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R12 |
| 2 | Conn_01x05_Female | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J5, J8 |
| 2 | DIN-5_180degree | drumkidcustom:MIDI_DIN5 | J2, J3 |
| 1 | 10 | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 10k | drumkidcustom:Potentiometer_Alps_RK09K_Single_Vertical | RV1 |
| 1 | 10uF | drumkidcustom:CP_Radial_D6.3mm_P2.50mm | C17 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 1nF | drumkidcustom:C_Disc_D3.4mm_W2.1mm_P2.50mm | C3 |
| 1 | 220uF | drumkidcustom:CP_Radial_D6.3mm_P2.50mm | C10 |
| 1 | 330 | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 4.7k | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 470 | drumkidcustom:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17 |
| 1 | 6N138 | Package_DIP:DIP-8_W7.62mm_Socket | U1 |
| 1 | ATmega328P-PU | Package_DIP:DIP-28_W7.62mm_Socket | U2 |
| 1 | AudioJack3_Ground_Switch | drumkidcustom:Tayda_3.5mm_stereo_TRS_jack_A-853 | J9 |
| 1 | Battery | Connector_Wire:SolderWirePad_1x02_P5.08mm_Drill1.5mm | BT1 |
| 1 | Conn_01x02_Female | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04_Female | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6 |
| 1 | Conn_01x06_Female | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J7 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | LM386 | Package_DIP:DIP-8_W7.62mm_Socket | U3 |
| 1 | SW_SPDT | drumkidcustom:EG1206 | SW1 |
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Questions
How big is the Drumkid PCB?
It measures 90 × 140 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Drumkid use?
70 parts, built around the ATMEGA328P-PU and LM386. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Drumkid KiCad files?
From the mattybrad/drumkid repository on GitHub, at the commit this page was made from: the board is pcb/v5/drumkid.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Drumkid design in my own project?
Its repository states no licence, so its author keeps all rights: ask mattybrad before reusing the design.