pimdh/euclids-squarePCB design and Rust embedded code for a Euclidean sequencer & sampler
Euclids square is an open-source printed circuit board by pimdh, from the pimdh/euclids-square repository on GitHub, published under the CC-BY-4.0 licence. It is a 2-layer board of 100 × 100 mm with 79 parts on 90 nets, routed with 554 tracks and 102 vias.
It is built around the 35RAPC4BHN2. Its parts include 26 capacitors, 19 resistors, 16 diodes, 8 transistors and 4 switches. It belongs with the STM32 boards of this library.
THIS IS A WORK IN PROGRESS
A drum sequencer and sampler based on layering multiple Euclidean rythms. Both firmware and PCB design files are open source licensed under the Creative Commons Attribution 4.0 International License.
It runs on a STM32F722 microcontroller on a custom PCB board.
The drum machine in written in embedded bare-metal Rust, based on the RTIC framework.
Currently, the sampler using the following samples, all in the public domain:
| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LED_RKGB | LED_THT:LED_D5.0mm-4_RGB | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 13 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19 |
| 12 | 10n | Capacitor_SMD:C_0603_1608Metric | C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24 |
| 8 | 100n | Capacitor_SMD:C_0603_1608Metric | C3, C4, C5, C6, C7, C8, C10, C25 |
| 8 | Q_NMOS_GSD | Package_TO_SOT_SMD:SOT-323_SC-70_Handsoldering | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 4 | 12 | Resistor_SMD:R_0603_1608Metric | R3, R4, R6, R7 |
| 4 | RotEnc_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC12E-Switch_Vertical_H20mm | SW1, SW2, SW3, SW4 |
| 3 | 10u | Capacitor_SMD:CP_Elec_4x5.4 | C11, C12, C26 |
| 2 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 56 | Resistor_SMD:R_0603_1608Metric | R2, R5 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 35RAPC4BHN2 | 35RAPC4BHN2:SWITCHCRAFT_35RAPC4BHN2 | J2 |
| 1 | LD1117S33TR_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | Resonator_Small | Crystal:Resonator_SMD-3Pin_3.2x1.3mm | Y1 |
| 1 | STM32F722RETx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | SWD | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10118194_Horizontal | J3 |
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
79 parts, built around the 35RAPC4BHN2. 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.
From the pimdh/euclids-square repository on GitHub, at the commit this page was made from: the board is hardware/main/euclids-square.kicad_pcb and its schematic hardware/main/euclids-square.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the CC-BY-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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