2 layers100 × 100 mm
2 layers116.1 × 98 mm
DropBear
speeduino/Hardware283Official Speeduino hardware designs
- Size
- 116.1 × 98 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 201
- Nets
- 247
- Pads
- 749
- Tracks, vias
- 1,873, 400
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 12 May 2021
- Updated
- 4 Apr 2026
Overview
DropBear is an open-source printed circuit board by speeduino, from the speeduino/Hardware repository on GitHub. It is a 2-layer board of 116.1 × 98 mm with 201 parts on 247 nets, routed with 1,873 tracks and 400 vias.
It is built around the TEENSY 4.1, TC4424AVOA and LMV324LIDT, with the KP234, W25Q32JVSSIQ and ZXMS6006DT8TA among its other parts. Its parts include 75 resistors, 43 diodes, 39 capacitors, 20 ICs and 5 switches. It belongs with the NXP (LPC, Kinetis, i.MX RT) boards of this library.
Main components
8
TEENSY 4.1
Development Boards & Kits - ARM ModuleSparkFun ElectronicsUncategorised
TC4424AVOA
SOIC-8-40℃~+150℃ 12ns 12ns 150uA 2 4.5A 4.5A 4.5V~18V MOSFET SOIC-8 Gate Drivers ROHSMicrochip TechnologyGate Drivers
LMV324LIDT
SO-14-40℃~+125℃ 1.3MHz 120uA 2.7V~5.5V 27nA 30nA 31nV/√Hz@1kHz 4 5uV/℃ 700V/ms 70mA 75dB 7mV Rail-to-rail output SO-14 Operational Amplifier ROHSSTMicroelectronicsOperational AmplifierKP234
DSOF-8-40℃~+125℃ 4.5V~5.5V 40Kpa~1.15bar DSOF-8 Pressure Sensors ROHSInfineon TechnologiesPressure Sensors
W25Q32JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 133MHz 1uA 2.7V~3.6V 20 Years 32Mbit 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
ZXMS6006DT8TA
SOT-223-8-40℃~+125℃ 2 2.8A 60V 75mΩ Active High Low Side Switch Overvoltage protection、Overcurrent Protection、Over temperature protection、Short-Circuit Protection SOT-223-8 Power Distribution Switches ROHSDiodes IncorporatedPower Distribution Switches
MAX9926UAEE/V+T
QSOP-16-150mil-40℃~+125℃ 2 4.5V~5.5V Programmable gain、Differential output QSOP-16-150mil ADCs/DACs - Special Purpose ROHSMaxim Integrated (Analog Devices)ADC/DAC - SpecializedEBC05DRXN
插件,P=2.54mm-65℃~+125℃ 10P 2.54mm Gold Phosphor bronze Through Hole 插件,P=2.54mm Edgeboard Connectors ROHSSullins Connector SolutionsEdgeboard Connectors
README
README.md
[
A low cost, DIY friendly Engine Management System (ECU) based on the Arduino framework
Speeduino
The Speeduino project is a flexible, fully featured Engine Management Systems (EMS aka ECU) based on the low cost and open source Arduino platform. It provides the hardware, firmware and software components that make up an engine management system, all provided under open licenses. With over 1000 installations, Speeduino has matured into a product that meets the needs of the hobbyist and enthusiast community without driving prices to the levels of traditional aftermarket ECUs.
Overview
This repositiory contains the official Speeduino hardware designs. All new designs have been made in Kicad, with some early boards developed in Fritzing.
License
These designs are release under the CERN Open Hardware License v2 Strong (CERN-OHL-S). This license is similar to the GPL, however is designed specifically for hardware design files, including PCB layouts and schematics. As the 'strongly reciprocal' version of the CERN OHL is used, you may use, copy, modify and create variations of these designs freely, provided that any changes or variations are also released under this CERN-OHL-S.
Where to Buy
Pre-made Speeduino units/boards are available from a number of official resellers
These resellers all contribute a portion of sales back to the project to allow for continued development to take place and we encourage sales through them whenever possible.
Of course, being open source, you are free to use the design files provided here to create your own hardware!
Support
In addition the manual referenced above, Speeduino has a large and very vibrant community of people to help out with your setup or any questions you might add.
- Speeduino Forum
- Discord [blocked]
Contributors
This project exists thanks to all the people who contribute, both in terms of code and testing provided. If you'd like to get involved, please have a read through Contributing and then jump on Discord to discuss things further
Parts
201| Qty | Value | Footprint | References |
|---|---|---|---|
| 33 | 1k | Resistor_SMD:R_0805_2012Metric | R11, R12, R13, R14, R15, R16, R17, R18, R21, R22, R23, R24, R25, R26, R27, R28 +17 |
| 21 | LED | LED_SMD:LED_0805_2012Metric | D2, D3, D4, D18, D19, D20, D21, D22, D23, D24, D25, D31, D36, D41, D42, D43 +5 |
| 15 | D | Diode_SMD:D_SOD-323 | D10, D11, D12, D13, D14, D15, D16, D17, D28, D29, D33, D34, D35, D37, D38 |
| 13 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C9, C12, C13, C14, C21, C22, C26, C32, C34, C38 |
| 8 | 100k | Resistor_SMD:R_0805_2012Metric | R59, R60, R61, R62, R69, R70, R71, R72 |
| 7 | 470R | Resistor_SMD:R_0805_2012Metric | R1, R31, R33, R34, R38, R39, R44 |
| 6 | 180k | Resistor_SMD:R_0805_2012Metric | R40, R41, R45, R46, R50, R53 |
| 6 | 348k | Resistor_SMD:R_0805_2012Metric | R42, R43, R47, R48, R51, R54 |
| 5 | 0.01uF | Capacitor_SMD:C_0805_2012Metric | C4, C7, C20, C29, C30 |
| 5 | 0.22uF | Capacitor_SMD:C_0805_2012Metric | C17, C18, C24, C25, C28 |
| 4 | 10k | Resistor_SMD:R_1206_3216Metric | R7, R8, R9, R10 |
| 4 | SW_DPDT_x2 | Misc:AYZ0202AGRLC | SW1, SW2, SW4, SW5 |
| 4 | TC4424A | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5, U6, U9, U10 |
| 4 | ZXMS6006DT8 | IC_Automotive:Diodes_SM8 | IC2, IC3, IC4, IC5 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric | R19, R20, R64 |
| 3 | 1uF | Capacitor_SMD:C_0805_2012Metric | C10, C11, C23 |
| 3 | 2.49k | Resistor_SMD:R_0805_2012Metric | R36, R37, R74 |
| 3 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP3, JP4, JP5 |
| 2 | 1nF | Capacitor_SMD:C_0805_2012Metric | C6, C8 |
| 2 | 270nF | Capacitor_SMD:C_0805_2012Metric | C15, C19 |
| 2 | 33uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C36, C37 |
| 2 | 4700pF | Capacitor_SMD:C_0805_2012Metric | C5, C16 |
| 2 | 47uF | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C33, C35 |
| 2 | D_Schottky | Diode_SMD:D_PowerDI-123 | D1, D32 |
| 2 | D_TVS | Diode_SMD:D_SOD-523 | D26, D27 |
| 2 | LMV324LIDT | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U12, U14 |
| 2 | MC33810 | IC_Automotive:SOIC32-P0.65-33N | U7, U8 |
| 2 | Q_DUAL_NMOS_S1G1D2S2G2D1 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2, Q3 |
| 1 | 0.33uF | Capacitor_SMD:C_0805_2012Metric | C39 |
| 1 | 0R | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 100uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C31 |
| 1 | 100uF | Capacitor_SMD:C_1206_3216Metric | C27 |
| 1 | 120R | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 2.4k | Resistor_SMD:R_0805_2012Metric | R32 |
| 1 | 3.88k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R30 |
| 1 | 604R | Resistor_SMD:R_0805_2012Metric | R29 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_500 | BT1 |
| 1 | D_Schottky | Diode_SMD:D_SMA_Handsoldering | D40 |
| 1 | D_TVS | Diode_SMD:D_SOD-123F | D30 |
| 1 | D_TVS | Diode_SMD:D_SMB | D39 |
| 1 | Delphi_Sicma_24 | Connector_Automotive:Delphi_Sicma_24_Grey | J1 |
| 1 | Delphi_Sicma_24 | Connector_Automotive:Delphi_Sicma_24_Black | J2 |
| 1 | EBC05DRXN | Misc:EBC05DRXN | J3 |
| 1 | Jumper_NO_Small | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | KP234 | Misc:KP234 | U11 |
| 1 | LOGO | Misc:dropbear_tiny | G*** |
| 1 | MAX9926UAEE_V+ | Package_SO:QSOP-16_3.9x4.9mm_P0.635mm | IC1 |
| 1 | MC78M05_TO252 | Package_TO_SOT_SMD:TO-252-2 | U15 |
| 1 | MCP2562-E-SN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Pololu_Breakout_DRV8825 | Module:Pololu_Breakout-16_15.2x20.3mm | A1 |
| 1 | Polyfuse | Fuse:Fuse_1812_4532Metric | F1 |
| 1 | Polyfuse | Fuse:Fuse_0603_1608Metric | F2 |
| 1 | SP720 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U13 |
| 1 | SW_DIP_x02 | Button_Switch_SMD:SW_DIP_SPSTx02_Slide_9.78x7.26mm_W8.61mm_P2.54mm | SW3 |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1 |
| 1 | Teensy4.1 | Shields:Teensy41 | U1 |
| 1 | W25Q32JVSS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U3 |
| 1 | ~ | Misc:ESP32-C3 SUPERMINI | U4 |
The 197 most common of 201 parts.
Questions
How big is the DropBear PCB?
It measures 116.1 × 98 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DropBear use?
201 parts, built around the TEENSY 4.1, TC4424AVOA, LMV324LIDT and KP234. 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 DropBear KiCad files?
From the speeduino/Hardware repository on GitHub, at the commit this page was made from: the board is DropBear/V2/DropBear.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the DropBear design in my own project?
Its repository states no licence, so its author keeps all rights: ask speeduino before reusing the design.
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