Pre Ignition
About the Pre Ignition PCB
Pre Ignition is an open source AVR/Arduino PCB design by OpenLogicEFI, published on GitHub. It is a board measuring 100 × 100 mm, with 136 components from 46 distinct parts.
Its main chip is the Arduino_Mega2560_Shield-Arduino, from the AVR/Arduino family. Other key parts include the MC7805CDTRKG, TC4427, SRV05-4-P-T7, ULN2003A and Pololu_Breakout_DRV8825. By type, the board carries 57 resistors, 33 capacitors, 8 ICs, 8 transistors, 7 connectors and 7 jumpers.
From the project
Hardware is based off an open source project called Speeduino by Josh Stewart.
Main components on the Pre Ignition
Pre Ignition bill of materials (BOM)
136 components, 46 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC7805CDTRKG | TO-252-2 | IC1 |
| 2 | TC4427 | SOIC-8_3.9x4.9mm_P1.27mm | U1, U2 |
| 4 | SRV05-4-P-T7 | SOT-23-6 | U3, U4, U5, U6 |
| 1 | ULN2003A | SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | Pololu_Breakout_DRV8825 | Pololu_Breakout-16_15.2x20.3mm | A1 |
| 4 | AO3400A | SOT-23 | Q1, Q2, Q3, Q4 |
| 4 | STP62NS04Z | TO255P460X1020X2008-3P | Q5, Q6, Q7, Q8 |
| 1 | Conn_02x10_Counter_Clockwise | Molex_Micro-Fit_3.0_43045-2000_2x10_P3.00mm_Horizontal | J1 |
| 1 | Conn_01x04 | Bluetooth-Module | J2 |
| 3 | Conn_02x20_Counter_Clockwise | 2x20_P2.54mm-Small-CrtYd | J3, J5, J10 |
| 1 | VR_Header | DIP-8_W7.62mm_Socket_VRConditioner | J4 |
| 1 | Conn_02x12_Counter_Clockwise | Molex_Micro-Fit_3.0_43045-2400_2x12_P3.00mm_Horizontal | J9 |
| 1 | nSMD025 | Fuse_1206_3216Metric | F1 |
| 1 | Ignition Voltage | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 2 | VR-Hall | PinHeader-1x03-P2.54mm-Jumper | JP2, JP3 |
| 2 | Pullup | 1x02-P2.54mm-Jumper | JP4, JP5 |
| 1 | Reset Control | PinHeader_1x03_P2.54mm_Vertical | JP6 |
| 1 | Jumper_3_Bridged12 | PinHeader_1x03_P2.54mm_Vertical | JP7 |
| 1 | Map | Freescale_98ARH99066A | Map1 |
| 1 | MOV | RV_Disc_D15.5mm_W3.9mm_P7.5mm | RV1 |
Show 26 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Logo_Open_Hardware_Large | detonationems | Speeduino_Compatible1 |
| 1 | Arduino_Mega2560_Shield-Arduino | Arduino_Mega2560_Shield_IO_Only_No_Silk_Screen | XA1 |
| 4 | LED | LED_0603_1608Metric | LED1, LED2, LED3, LED4 |
| 1 | D_Schottky | D_SMA | D1 |
| 4 | 1N4148WS | D_SOD-323F | D2, D3, D4, D5 |
| 1 | 1SMAF4733A | SODFL4626X120N | D6 |
| 1 | 10uF | C_1206_3216Metric | C1 |
| 13 | 0.1uF | C_0603_1608Metric | C2, C4, C5, C7, C10, C11, C17, C18 +5 |
| 1 | 47uF | C_1206_3216Metric | C3 |
| 3 | 1uF | C_0603_1608Metric | C6, C8, C13 |
| 1 | 22uF | C_0603_1608Metric | C9 |
| 2 | 470pF | C_0603_1608Metric | C12, C33 |
| 8 | 0.22uF | C_0603_1608Metric | C14, C15, C20, C21, C24, C25, C28, C29 |
| 2 | 0.01uF | C_0603_1608Metric | C16, C31 |
| 2 | 33uF | C_0603_1608Metric | C30, C32 |
| 12 | 100K | R_0603_1608Metric | R1, R2, R9, R10, R17, R18, R21, R22 +4 |
| 14 | 1K | R_0603_1608Metric | R3, R4, R11, R12, R19, R20, R23, R24 +6 |
| 5 | 2.4k | R_0603_1608Metric | R5, R6, R13, R14, R36 |
| 4 | 22 | R_0805_2012Metric | R7, R8, R15, R16 |
| 9 | 470 | R_0603_1608Metric | R25, R32, R33, R38, R39, R42, R43, R44 +1 |
| 5 | 120 | R_0603_1608Metric | R26, R48, R50, R52, R54 |
| 2 | 51k | R_0603_1608Metric | R27, R55 |
| 1 | 3.9k | R_0603_1608Metric | R29 |
| 2 | 2.49k | R_0603_1608Metric | R37, R41 |
| 2 | 10k | R_0603_1608Metric | R46, R57 |
| 1 | 2K | R_0603_1608Metric | R59 |
Pre Ignition design files
The KiCad project lives in the OpenLogicEFI/Hardware repository on GitHub; these links point at the commit this page was built from.
Pre Ignition: common questions
What microcontroller does the Pre Ignition use?
The Pre Ignition is built around the Arduino_Mega2560_Shield-Arduino, from the AVR/Arduino family.
How big is the Pre Ignition PCB?
The Pre Ignition measures 100 × 100 mm and is 1.6002 mm thick.
How many components are on the Pre Ignition?
136 components, from 46 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Pre Ignition design files?
From the OpenLogicEFI/Hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Pre Ignition design in my own project?
The repository has no license, so all rights stay with OpenLogicEFI. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Pre Ignition without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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