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 layers98.2 × 53.3 mm
Pre Ignition
OpenLogicEFI/Hardware19Hardware is based off an open source project called Speeduino by Josh Stewart.
- Size
- 98.2 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 104
- Nets
- 77
- Pads
- 394
- Tracks, vias
- 718, 86
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- 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 98.2 × 53.3 mm with 104 parts on 77 nets, routed with 718 tracks and 86 vias.
It is built around the TC4427EOA, SRV05-4-P-T7 and L7805CDT, with the ULN2003A, 1N4148WS and AO3400A among its other parts. Its parts include 40 resistors, 29 capacitors, 8 connectors, 7 ICs and 5 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
7
TC4427EOA
SOIC-8-40℃~+85℃ 1.5A 1.5A 19ns 19ns 2 2.4V 4.5V~18V 400uA 800mV MOSFET SOIC-8 Gate Drivers ROHSMicrochip TechnologyGate Drivers
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)
L7805CDT
TO-252-2L2V@(350mA) 35V 4.2mA 40uV 500mA 5V 80dB@(120Hz) Fixed Positive Short Circuit Protection TO-252-2L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHXY MOSFETVoltage 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
B5819
SOD-523SOD-523 Schottky Diodes ROHSDongChenSchottky 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
104| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100nF | Capacitor_SMD:C_0603_1608Metric | C4, C5, C10, C11, C13, C15, C17, C18, C19, C22, C26, C27 |
| 10 | 1K | Resistor_SMD:R_0603_1608Metric | R3, R4, R15, R19, R20, R28, R30, R31, R40, R58 |
| 10 | 470 | Resistor_SMD:R_0603_1608Metric | R9, R13, R14, R22, R23, R32, R38, R39, R42, R44 |
| 8 | 220nF | Capacitor_SMD:C_0603_1608Metric | C14, C20, C21, C23, C24, C25, C28, C29 |
| 7 | 100K | Resistor_SMD:R_0603_1608Metric | R1, R2, R11, R17, R18, R49, R51 |
| 3 | 2.4k | Resistor_SMD:R_0603_1608Metric | R5, R6, R16 |
| 3 | SRV05-4-P-T7 | Package_TO_SOT_SMD:SOT-23-6 | U3, U4, U6 |
| 2 | 10 | Resistor_SMD:R_0805_2012Metric | R7, R8 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R21, R46 |
| 2 | 1N4148WS | Diode_SMD:D_SOD-323F | D2, D4 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C6, C12 |
| 2 | 2.49k | Resistor_SMD:R_0603_1608Metric | R37, R41 |
| 2 | 330nF | Capacitor_SMD:C_0603_1608Metric | C2, C7 |
| 2 | Conn_01x04 | Detonation:1x02-Proto | J6, J7 |
| 2 | Conn_01x04 | Misc:1X4-PROTO | J1, J2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | LED1, LED2 |
| 2 | Pullup | Detonation:1x02-Proto | JP4, JP5 |
| 2 | STP62NS04Z | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2 |
| 1 | 10nF | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 10uF | Capacitor_SMD:CP_Elec_5x5.3 | C1 |
| 1 | 120 | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | 2K | Resistor_SMD:R_0603_1608Metric | R59 |
| 1 | 3.9k | Resistor_SMD:R_0603_1608Metric | R29 |
| 1 | 4.7nF | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 47pF | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 47uF | Capacitor_SMD:C_1206_3216Metric | C3 |
| 1 | 51k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | Arduino_Mega2560_Shield-Arduino | MyLibs:Arduino_Mega2560_Shield_IO_Only_No_Silk_Screen | XA1 |
| 1 | B5819 | Diode_SMD:D_SOD-123 | D1 |
| 1 | Conn_01x04 | Detonation:2x8-Proto | J8 |
| 1 | Conn_01x04 | Detonation:1x1-GPIO | J5 |
| 1 | Conn_02x12_Counter_Clockwise | Connector_Molex:Molex_Micro-Fit_3.0_43045-2400_2x12_P3.00mm_Horizontal | J3 |
| 1 | Ignition Voltage | Misc:3x1-GPIO | JP1 |
| 1 | L7805CDT | Package_TO_SOT_SMD:TO-252-2 | IC1 |
| 1 | Logo_Open_Hardware_Small | Detonation:DetonationEMS-17mm | G3 |
| 1 | Logo_Open_Hardware_Small | Detonation:SpeeduinoCompatible-17mm | G1 |
| 1 | Logo_Open_Hardware_Small | Detonation:Pre-Ignition-800 | G2 |
| 1 | Logo_Open_Hardware_Small | Detonation:DetonationEMS | G4 |
| 1 | MOV | Detonation:MOV | RV1 |
| 1 | MPXH6250AC6U-MPXH6250 | Detonation:MPXH6250 | IC2 |
| 1 | Pololu_Breakout_DRV8825 | Detonation:DVR8825 | A1 |
| 1 | TC4427 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | ULN2003A | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | VR-HALL | Misc:3x1-GPIO | JP2 |
| 1 | VR-Hall | Misc:3x1-GPIO | JP3 |
| 1 | VR_Header | Misc:DIP-8_W7.62mm_Socket_VRConditioner | J4 |
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Questions
How big is the Pre Ignition PCB?
It measures 98.2 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pre Ignition use?
104 parts, built around the TC4427EOA, SRV05-4-P-T7, L7805CDT and ULN2003A. 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 x2/MX2A/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.