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 layers98.8 × 69.8 mm
Pre Ignition
OpenLogicEFI/Hardware19Hardware is based off an open source project called Speeduino by Josh Stewart.
- Size
- 98.8 × 69.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 167
- Nets
- 176
- Pads
- 553
- Tracks, vias
- 886, 667
- Pours
- 6
- 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 98.8 × 69.8 mm with 167 parts on 176 nets, routed with 886 tracks and 667 vias.
It is built around the TC4424EPA, CH340N and KP234XTMA1, with the SRV05-4, 74LVC1G157GW,125 and ULN2003ADRG among its other parts. Its parts include 59 resistors, 47 capacitors, 12 ICs, 11 transistors and 10 diodes.
Main components
12
TC4424EPA
PDIP-823ns 25ns 3A 3A MOSFET PDIP-8 Gate Drivers ROHSMicrochip TechnologyGate Drive ICs
CH340N
SOP-8-20℃~+70℃ 1 2Mbps 3.3V、5V USB 2.0 USB to serial SOP-8 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
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
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
74LVC1G157GW,125
SOT-363-6-40℃~+125℃ 1.65V~5.5V 2/1 32mA 32mA 4uA 5ns@5.5V,50pF 74LVC Multiplexer Power-off protection、Level shifting Single Supply SOT-363-6 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders
ULN2003ADRG
SOP-16SOP-16 Darlington Transistor Arrays ROHSQNHDarlington Transistor Arrays
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
DSK210
SOD-123FLSchottky Diodeshongjiacheng
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
MX23A40NF1
插件2 Automotive Connector Socket Right Angle 插件 Automobile Connectors ROHSJAE ElectronicsAutomobile Connectors
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)SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
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
167| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C12, C14, C17, C18, C21, C23, C25, C26, C27, C28, C30, C34, C36, C37, C38 +7 |
| 18 | 470r | Resistor_SMD:R_0402_1005Metric | R13, R15, R16, R29, R30, R31, R32, R38, R39, R40, R41, R42, R49, R50, R52, R53 +2 |
| 11 | 100k | Resistor_SMD:R_0402_1005Metric | R5, R6, R7, R8, R9, R10, R14, R22, R26, R27, R28 |
| 11 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R11, R20, R21, R23, R24, R25, R43, R44, R45, R47 |
| 11 | 220nF | Capacitor_SMD:C_0402_1005Metric | C3, C11, C15, C19, C20, C22, C24, C29, C31, C33, C35 |
| 7 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q7, Q8, Q9, Q10, Q11 |
| 5 | TestPoint | Detonation:TestPoint_THT_D0.6mm_Drill0.3mm | TP1, TP2, TP3, TP4, TP5 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C13, C16, C41, C42 |
| 4 | 22 | Resistor_SMD:R_0805_2012Metric | R33, R34, R35, R36 |
| 4 | 5.6v | Diode_SMD:D_SOD-323 | D3, D4, D8, D10 |
| 4 | LED | LED_SMD:LED_0603_1608Metric | IGN1, IGN2, IGN3, IGN4 |
| 4 | STP75N04Z | Package_TO_SOT_THT:TO-220-3_Vertical | Q3, Q4, Q5, Q6 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R18, R19, R48 |
| 3 | 10nF | Capacitor_SMD:C_0402_1005Metric | C2, C8, C9 |
| 3 | DSK210 | Diode_SMD:D_SOD-123F | D5, D6, D7 |
| 3 | FET Bypass | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP5 |
| 3 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U5, U6, U8 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric | C4, C47 |
| 2 | 2.49k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R59, R60 |
| 2 | 2k | Resistor_SMD:R_0402_1005Metric | R12, R46 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R57, R58 |
| 2 | 51k | Resistor_SMD:R_0402_1005Metric | R37, R51 |
| 2 | Conn_01x04 | Detonation:1X4-PROTO-NoSilk | J3, J4 |
| 2 | DIRECT/VR | Detonation:1x03-Proto | JP3, JP4 |
| 2 | TC4424 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3, U4 |
| 1 | 100uF | Capacitor_Tantalum_SMD:CP_EIA-3528-15_AVX-H | C6 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 120r | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D9 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 2.2k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 3.9k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 470nF | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 47pF | Capacitor_SMD:C_0402_1005Metric | C32 |
| 1 | 74LVC1G157GW,125 | Detonation:SOP65P210X110-6N | IC2 |
| 1 | 7805 | Detonation:TO-220-3_Vertical_SmallCrtYrd | IC1 |
| 1 | CH340N | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | Conn_01x01 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J6 |
| 1 | Conn_01x02 | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP7 |
| 1 | DRV8825_Module | Detonation:DVR8825-Labeled-Front | A1 |
| 1 | KP234XTMA1 | Detonation:KP234-Handsoldering | IC3 |
| 1 | LOGO | Detonation-Logos:DCWerx-19mm | G*** |
| 1 | Logo_Open_Hardware_Small | Symbol:OSHW-Logo2_7.3x6mm_SilkScreen | G2 |
| 1 | Logo_Open_Hardware_Small | Detonation-Logos:SpeeduinoCompatible-14mm | G1 |
| 1 | MPXHZ6400 | Detonation:MPXHxxx_Handsoldering | IC4 |
| 1 | MX23A40NF1 | Detonation:MX23A40NF1 | J1 |
| 1 | Mega_Pro_VinPinsUnpopulated | Detonation:Arduino_Mega_Mini_2560_SmallCrtYd_NoVin | U2 |
| 1 | RN_1k | Resistor_SMD:R_Array_Concave_4x0603 | RN1 |
| 1 | Reset Control | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | S1 |
| 1 | SMAJ18CA | Diode_SMD:D_SMA | D1 |
| 1 | SS34 | Diode_SMD:D_SMA | D2 |
| 1 | SolderJumper_3_Open | Detonation:SolderJumper-3-OPEN | JP6 |
| 1 | ULN2003ADR | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | USB-S0 | Connector_JST:JST_PH_B6B-PH-K_1x06_P2.00mm_Vertical | J5 |
| 1 | VR_Header | Detonation:Socket_VRConditioner_Corrected | J2 |
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Questions
How big is the Pre Ignition PCB?
It measures 98.8 × 69.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pre Ignition use?
167 parts, built around the TC4424EPA, CH340N, KP234XTMA1 and SRV05-4. 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/Spark Gap/Spark Gap X4/RevC/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.