4 layers115.5 × 96.2 mm
Closed deck x4
OpenLogicEFI/Hardware
Hardware is based off an open source project called Speeduino by Josh Stewart.
245 parts19
2 layers100 × 99.8 mm
Pre Ignition
OpenLogicEFI/Hardware19Hardware is based off an open source project called Speeduino by Josh Stewart.
- Size
- 100 × 99.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 166
- Nets
- 189
- Pads
- 591
- Tracks, vias
- 818, 438
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Mar 2020
- Updated
- 19 Oct 2026
Overview
Pre Ignition is an open-source printed circuit board by OpenLogicEFI, from the OpenLogicEFI/Hardware repository on GitHub. It is a 2-layer board of 100 × 99.8 mm with 166 parts on 189 nets, routed with 818 tracks and 438 vias.
It is built around the TC4424EPA, KP234XTMA1 and DRV8825PWP, with the SRV05-4-P-T7, L78M05ABDT-TR and ULN2003A among its other parts. Its parts include 63 resistors, 39 capacitors, 24 diodes, 11 transistors and 8 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
12
TC4424EPA
PDIP-823ns 25ns 3A 3A MOSFET PDIP-8 Gate Drivers ROHSMicrochip TechnologyGate Drive ICs
KP234XTMA1
SMD-8P-40℃~+125℃ 1.5Kpa 1ms 4.5V~5.5V 40Kpa~1.15bar Temperature Sensor Yes SMD-8P Pressure Sensors ROHSInfineon TechnologiesPressure Sensors
DRV8825PWP
HTSSOP-28-EP-40℃~+85℃ 2 2.5A 200mΩ 32 8.2V~45V Bipolar Driver STEP/DIR Yes HTSSOP-28-EP Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
SRV05-4-P-T7
SOT-23-612V 1A@8/20us 3.5pF 500W@8/20us 5V 5uA 6V ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSPROTEKESD And Surge Protection (TVS/ESD)
L78M05ABDT-TR
TO-252-2(DPAK)-40℃~+125℃@(Tj) 1 2V@(350mA) 35V 40uV 500mA 5V 62dB@(120Hz) 6mA Fixed Over Temperature Protection、Short Circuit Protection Positive TO-252-2(DPAK) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ULN2003A
SOP-16-40℃~+85℃ 0.93mA 100uA 15pF 20uA 30V 50V Seven channels SOP-16 Darlington Transistor Arrays ROHSUMWDarlington Transistor Arrays
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
IRFR024N
TO-252-55℃~+175℃ 1 N-channel 1.9nF 2.5V 25A 30nC@30V 33mΩ@10V 50W 60V 95pF TO-252 MOSFETs ROHSTECH PUBLICMOSFETs
SMF30CA
SOD-123FL-55℃~+150℃ 1uA 200W@10/1000us 30V 36.8V 4.1A@10/1000us 48.4V Bidirectional IEC 61000-4-2 TVS SOD-123FL ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
SMAJ18CA
DO-214AC(SMA)-65℃~+150℃ 13.7A@10/1000us 18V 1uA 22.1V 29.2V 400W@10/1000us Bidirectional IEC 61000-4-2、IEC 61000-4-4 TVS DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHSLittelfuseESD And Surge Protection (TVS/ESD)
README
README.mdOpenLogicEFI
Formerly: DetonationEMS
OpenLogicEFI ECU's are based off an open source project called Speeduino by Josh Stewart. Currently all released boards use official Speeduino firmware. In TunerStudio set to "Board Layout" to "Speeduino 0.4"
License
All designs are released under the TAPR Open Hardware License v1.0
Documentation
-
The Official Speeduino Manual, documents and discord are the best places to start.
Parts
166| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | 100nF | Capacitor_SMD:C_0603_1608Metric | C11, C13, C15, C17, C18, C19, C21, C23, C24, C25, C26, C28, C30, C32, C34, C36 +5 |
| 14 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R6, R19, R20, R22, R32, R35, R40, R43, R63 |
| 14 | 51k | Resistor_SMD:R_0402_1005Metric | R11, R12, R13, R14, R15, R16, R17, R18, R33, R36, R41, R44, R50, R54 |
| 10 | 470 | Resistor_SMD:R_0603_1608Metric | R21, R45, R48, R49, R53, R55, R56, R57, R58, R59 |
| 9 | 1n4148ws | Diode_SMD:D_SOD-323F | D4, D5, D6, D7, D8, D10, D12, D14, D21 |
| 8 | 2.4k | Capacitor_SMD:C_0603_1608Metric | R24, R25, R26, R27, R28, R29, R30, R46 |
| 7 | 220nF | Capacitor_SMD:C_0603_1608Metric | C20, C22, C27, C29, C31, C33, C35 |
| 7 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q5, Q6, Q7, Q8, Q9, Q10, Q11 |
| 6 | LED | LED_SMD:LED_0603_1608Metric | D17, D18, IGN1, IGN2, IGN3, IGN4 |
| 5 | 470r | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10, R61 |
| 4 | 10 | Resistor_SMD:R_1206_3216Metric | R31, R34, R39, R42 |
| 4 | IRFR024 | Package_TO_SOT_SMD:TO-252-2 | Q1, Q2, Q3, Q4 |
| 4 | SMF30CA | Diode_SMD:D_SOD-123F | D9, D11, D13, D15 |
| 3 | 10nF | Capacitor_SMD:C_0603_1608Metric | C8, C9, C10 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C12, C14, C16 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R52, R62 |
| 2 | 2.49k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R47, R51 |
| 2 | 2k | Resistor_SMD:R_0603_1608Metric | R37, R38 |
| 2 | Conn_01x03 | Detonation:1x03-Proto | JP2, JP3 |
| 2 | Divider | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP9, JP10 |
| 2 | MOS Bypass | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP7, JP8 |
| 2 | SRV05-4-P-T7 | Package_TO_SOT_SMD:SOT-23-6 | U3, U4 |
| 2 | TC4424 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2 |
| 1 | 0r | Resistor_SMD:R_1206_3216Metric | R23 |
| 1 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C6 |
| 1 | 2.2uF | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 220uf | w_capacitors:CP_6.3x11mm_horiz-R | C39 |
| 1 | 3.9k | Resistor_SMD:R_0603_1608Metric | R60 |
| 1 | 330nF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 33uF | Capacitor_Tantalum_SMD:CP_EIA-7343-31_Kemet-D | C1 |
| 1 | Arduino_Mega2560_Shield-Arduino | Detonation:Arduino-Mega2560-Shield-Speeduino | XA1 |
| 1 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D19 |
| 1 | Conn_01x01 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J1 |
| 1 | Conn_02x10_Counter_Clockwise | Detonation:Molex_Micro-Fit_3.0_43045-2000_2x10_P3.00mm_Horizontal | J5 |
| 1 | Conn_02x12_Counter_Clockwise | Detonation:PROTO-3X8-24pin | J4 |
| 1 | Conn_02x12_Counter_Clockwise | Detonation:Molex_Micro-Fit_3.0_43045-2400_2x12_P3.00mm_Horizontal | J7 |
| 1 | DRV8825 | Detonation:DVR8825-Labeled-Front | A1 |
| 1 | External Map | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP11 |
| 1 | KP234XTMA1 | Detonation:KP234-Handsoldering | U6 |
| 1 | L78M05ABDT-TR | Detonation:TO-252-2-Thermal-with-Silk | IC1 |
| 1 | LOGO | Detonation-Logos:SpeeduinoCompatible-17mm | G1 |
| 1 | LOGO | Detonation-Logos:open-logic-10 | G2 |
| 1 | Map/Baro Sensor Socket | Connector_PinSocket_2.54mm:PinSocket_2x03_P2.54mm_Vertical | J8 |
| 1 | RST CTRL | Detonation:1x02-Proto | S0 |
| 1 | SMAJ18CA | Diode_SMD:D_SMA | D2 |
| 1 | SMF6.0CA | Diode_SMD:D_SOD-123F | D3 |
| 1 | SS14 | Diode_SMD:D_SMA | D1 |
| 1 | Serial0 | Detonation:1X4-PROTO | J2 |
| 1 | Serial3 | Detonation:1X4-PROTO | J3 |
| 1 | SolderJumper_3_Bridged12 | Detonation:1x03_Horizontal_2.54mm | JP1 |
| 1 | SolderJumper_3_Open | Detonation:SolderJumper-3-OPEN | JP6 |
| 1 | ULN2003A | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U5 |
| 1 | VR_Header | Detonation:Socket_VRConditioner_Corrected | J6 |
| 1 | Zener 5.6v | Diode_SMD:D_SOD-323 | D20 |
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Questions
How big is the Pre Ignition PCB?
It measures 100 × 99.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pre Ignition use?
166 parts, built around the TC4424EPA, KP234XTMA1, DRV8825PWP and SRV05-4-P-T7. 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 Pre Ignition KiCad files?
From the OpenLogicEFI/Hardware repository on GitHub, at the commit this page was made from: the board is Engine Managment/Pre-Ignition/Pre-Ignition x4/MX4D/Pre_Ignition.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pre Ignition design in my own project?
Its repository states no licence, so its author keeps all rights: ask OpenLogicEFI before reusing the design.