2 layers175.8 × 184.8 mm
SofleKeyboard
josefadamcik/SofleKeyboard
A split keyboard based on Lily58, Crkbd and Helix keyboards
87 parts2.6k
2 layers70 × 101.7 mm
Nucleo expansion
j-silv/stm32-3d-printer-controller9STM32 Nucleo expansion board developed for controlling a RepRap 3D printer
- Size
- 70 × 101.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 87
- Nets
- 126
- Pads
- 338
- Tracks, vias
- 682, 87
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 23 Jul 2022
- Updated
- 31 Jul 2022
Overview
Nucleo expansion is an open-source printed circuit board by j-silv, from the j-silv/stm32-3d-printer-controller repository on GitHub, published under the MIT licence. It is a 2-layer board of 70 × 101.7 mm with 87 parts on 126 nets, routed with 682 tracks and 87 vias.
It is built around the BD237. Its parts include 32 connectors, 20 resistors, 13 capacitors, 5 fuses and 3 transistors.
Main components
1README
README.mdSTM32 Nucleo 3D printer controller
This project concerns the replacement of a Teensylu 3D printer controller board for a uDelta RepRap printer. An STM32 NUCLEO-F446RE expansion board (shield) is currently being developed as the replacement. After the board is designed and fabricated, the Marlin open source firmware will be configured for use with the Nucleo board.
Folder structure
./kicad/stm32_nucleo_expansion/
- Contains all the CAD files for the shield PCB
Power usage
I will be using a S-240-12 12 V 240 W power supply Here is an approximate distribution of the power consumption:
High power usage
Pololu stepper motors
- StepStick from RepRap
- Max current of 2 A per coil, with overcurrent output protection at 2.1 A
- On-board current limit via potentiometer needs to be checked (TODO)
Extruder
- 12 V, 3.5 A (40 W) as specified here
Bed
- 12 V, 3.5 A (40 W) as specified here
Extruder fans
- 12 V, 0.18 A (2.16 W) as specified here
Low power usage
NUCLEO-F446RE
- Supplied with USB 5 V: 300 mA max input current
- Supplied with external 12 V: 250 mA max input current
- Measure current consumed by NUCLEO board via JP5 (TODO)
Pololu stepper motors
- Approximately 15 mA consumption at 3.3 V: 50 mW
microSD card
LCD
- Typical 1.1 mA consumption. At 5 V: 5 mW
PCB
The shield is a 2-layer board fabricated by JLCPCB. It plugs directly into the NUCLEO-F446RE via two 38-pin morpho connectors.
Acknowledgments
- Design inspired by Teensylu RepRap
- Kudos to mobilinkd for the STM32 morpho connector template
- Kudos to bettak for the RepRap StepStick 3D model
- Thanks to r/PrintedCircuitBoard on Reddit for the advice and comments
Parts
87| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12, J18, J19, J26 |
| 12 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R7, R10, R11, R12, R13, R14, R15, R16 |
| 6 | TestPoint_Pad_D1.0mm | TestPoint:TestPoint_Pad_D1.0mm | ⏚, ⏚, ⏚, ⏚, ⏚, ⏚ |
| 5 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C9, C10, C11, C12 |
| 4 | 100u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2, C3, C4 |
| 4 | Conn_01x04_Male | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J13, J14, J15, J16 |
| 4 | Pololu_Breakout_A4988 | pololu:Pololu_Breakout-16_15.2x20.3mm | A1, A2, A3, A4 |
| 3 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9, R18 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C6, C13 |
| 3 | Conn_01x03_Male | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J27, J28, J29 |
| 3 | Screw_Terminal_01x02 | wuerth_connector:691137710002 | J20, J23, J24 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R17, R19 |
| 2 | 4k7 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 500mA | Fuse:Fuse_0603_1608Metric_Pad1.05x0.95mm_HandSolder | F2, F3 |
| 2 | 5A | Fuse:Fuse_0603_1608Metric_Pad1.05x0.95mm_HandSolder | F1, F4 |
| 2 | Conn_01x02_Male | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J22, J32 |
| 2 | Conn_02x05_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J17, J21 |
| 2 | P30N06LE | Package_TO_SOT_THT:TO-220-3_Vertical | Q2, Q3 |
| 2 | TestPoint_Small | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2 |
| 1 | 15A | fuse:3586_mini | F5 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R20 |
| 1 | 680u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C7 |
| 1 | BD237 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1 |
| 1 | GREEN | LED_THT:LED_D3.0mm | D1 |
| 1 | LOGO | qr_code:github_link | G*** |
| 1 | Micro_SD_Card_Det_Hirose_DM3D-SF | Connector_Card:microSD_HC_Hirose_DM3D-SF | J25 |
| 1 | NUCLE_F446RE_MORPHO_CN10 | Connector_PinSocket_2.54mm:PinSocket_2x19_P2.54mm_Vertical | CN10 |
| 1 | NUCLE_F446RE_MORPHO_CN7 | Connector_PinSocket_2.54mm:PinSocket_2x19_P2.54mm_Vertical | CN7 |
Questions
How big is the Nucleo expansion PCB?
It measures 70 × 101.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Nucleo expansion use?
87 parts, built around the BD237. 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 Nucleo expansion KiCad files?
From the j-silv/stm32-3d-printer-controller repository on GitHub, at the commit this page was made from: the board is kicad/stm32_nucleo_expansion/nucleo_expansion.kicad_pcb and its schematic kicad/stm32_nucleo_expansion/nucleo_expansion.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Nucleo expansion design in my own project?
Its repository publishes it under the MIT 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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