HardLabs

Coilonplugv3

swagprincess·coilonplug·kicad/v3/coilonplugv3.kicad_pcb

Coilonplugv3 PCB layout, top view — open source AVR/Arduino board by swagprincess

About the Coilonplugv3 PCB

Coilonplugv3 is an open source AVR/Arduino PCB design by swagprincess, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 26.3 × 33.4 mm, with 15 components from 9 distinct parts.

Its main chip is the ATTINY84A-SS, from the AVR/Arduino family. Other key parts include the SN74LVC1G17DBVR and L78L05_SOT89. By type, the board carries 4 ICs, 4 capacitors, 4 resistors, 2 diodes and 1 transistor.

From the project

Dwell converter/shaper for a stock ECU COP conversion on a Miata

This board lets you use a Toyota/Audi/etc "coil on plug" ignition system with the stock ecu in a Mazda MX5/Miata (1989-2005).

The board will take in a variable dwell signal for the stock coilpack and output a (falling edge synchronised) stable, adjustable dwell pulse.

Current setting is 70 "ticks" of TIMER1, around 2.2ms, correct for Toyota COP's at running voltages (should be good for Audi R8 coils too).

Coilonplugv3, from the project README
From the project README

Main components on the Coilonplugv3

ATTINY84A-SSSN74LVC1G17DBVRL78L05_SOT89

Coilonplugv3 bill of materials (BOM)

15 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY84A-SS
ATtiny84A-SS
U1
2
SN74LVC1G17DBVR
U2, U3
1
L78L05_SOT89
U4
1
DMP3098LSD-13
Q1
2
MM3ZXX
MM3Zxx
D1, D2
2
100N
100n
C1, C3
1
330N
330n
C2
1
10U
10u
C4
4
10K
10k
R1, R2, R3, R4

Coilonplugv3 design files

The KiCad project lives in the swagprincess/coilonplug repository on GitHub; these links point at the commit this page was built from.

Coilonplugv3: common questions

What microcontroller does the Coilonplugv3 use?

The Coilonplugv3 is built around the ATTINY84A-SS, from the AVR/Arduino family.

How big is the Coilonplugv3 PCB?

The Coilonplugv3 measures 26.3 × 33.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Coilonplugv3?

15 components, from 9 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 Coilonplugv3 design files?

From the swagprincess/coilonplug repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Coilonplugv3 design in my own project?

Yes, under the terms of its GPL-3.0 license, which swagprincess chose for the repository.

Can I test firmware for the Coilonplugv3 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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