HardLabs

Copv2

swagprincess·coilonplug·kicad/v2/copv2.kicad_pcb

Copv2 PCB layout, top view — open source AVR/Arduino board by swagprincess

About the Copv2 PCB

Copv2 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 30 × 42 mm, with 22 components from 11 distinct parts.

Its main chip is the ATTINY84A-SS, from the AVR/Arduino family. Other key parts include the LM393 and LM78M05_TO252. By type, the board carries 12 resistors, 6 capacitors, 3 ICs 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).

Copv2, from the project README
From the project README

Main components on the Copv2

ATTINY84A-SSLM393LM78M05_TO252

Copv2 bill of materials (BOM)

22 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY84A-SS
ATtiny84A-SS
U1
1
LM393
U2
1
LM78M05_TO252
U3
1
DMP3098LSD-13
Q1
3
100N
100n
C1, C5, C6
1
10U
10u
C2
1
330N
330n
C3
1
2200U
2200u
C4
6
10K
10k
R1, R2, R3, R4, R11, R12
2
4.7K
4.7k
R5, R6
4
100
R7, R8, R9, R10

Copv2 design files

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

Copv2: common questions

What microcontroller does the Copv2 use?

The Copv2 is built around the ATTINY84A-SS, from the AVR/Arduino family.

How big is the Copv2 PCB?

The Copv2 measures 30 × 42 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Copv2?

22 components, from 11 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 Copv2 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 Copv2 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 Copv2 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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