HardLabs

Klxecu

JourneyMan61·klxecu·v1/klxecu_v1.kicad_pcb

Klxecu PCB layout, top view — open source AVR/Arduino board by JourneyMan61

About the Klxecu PCB

Klxecu is an open source AVR/Arduino PCB design by JourneyMan61, published on GitHub. It is a 2-layer board measuring 129.5 × 73.7 mm, with 70 components from 38 distinct parts.

Its main chip is the ATtiny84-20P, from the AVR/Arduino family. Other key parts include the SP721, ERZ-V14D220, LM340T-5.0, MAX9924UAUB+ and 74LS14DR. By type, the board carries 24 capacitors, 24 resistors, 7 ICs, 7 transistors, 4 connectors and 2 diodes.

From the project

Speeduino based ECM for the fuel injected KLX 250 and 300

Speeduino based ECM for the fuel injected KLX 250 and 300. Firmware compatible with the Speeduino 0.4.4c. It has only one fuel and ignition channel, but adds a few extra features, namely:

- control of the check engine/temperature warning lights on the dashboard - control of the secondary throttle plate in the intake (we'll abuse the open loop idle control built in to the speeduino) - control of the bike's safety switches (tbd, might just use some logic gates. currently a DIP8 socket is available on the board for testing) - auxiliary "self diag" pin connected to the speeduino processor

Klxecu, from the project README
From the project README

Main components on the Klxecu

SP721ERZ-V14D220LM340T-5.0MAX9924UAUB+ATtiny84-20P74LS14DRTC4422AVPAPololu_Breakout_A4988

Klxecu bill of materials (BOM)

70 components, 38 distinct parts.

QtyPartRefs
1
SP721
IC1
1
ERZ-V14D220
U1
1
LM340T-5.0
U2
1
MAX9924UAUB+
U3
1
ATtiny84-20P
U4
1
74LS14DR
U5
1
TC4422AVPA
U6
1
Pololu_Breakout_A4988
A1
1
2N3904
Q1
6
STP62NS04Z
Q2, Q3, Q4, Q5, Q6, Q7
1
Conn_02x20_Odd_Even
J1
1
Conn_02x18_Odd_Even
J2
1
Conn_02x16_Odd_Even
J3
1
Conn_01x01_Male
J4
1
Jumper_3_Open
JP1
1
1N5818
D1
1
1N5919BG
D2
1
10uf
C1
2
u1
C2, C3
1
47uf
C4
Show 18 more
QtyPartRefs
8
0.1uf
C5, C7, C8, C9, C14, C15, C16, C21
1
1nf
C6
6
0.22uF
C10, C11, C12, C13, C18, C19
1
0.33uF
C17
1
10nf
C20
2
1uf
C22, C24
1
100uf
C23
1
4.7k
R1
3
10k
R2, R3, R10
2
2.49k
R4, R8
7
470
R5, R16, R17, R18, R19, R20, R21
1
3.9k
R6
5
1k
R7, R9, R11, R12, R15
1
100k
R13
1
47 2w
R14
1
100k
RN2
1
1k
RN3
1
10k
RN4

Klxecu design files

The KiCad project lives in the JourneyMan61/klxecu repository on GitHub; these links point at the commit this page was built from.

Klxecu: common questions

What microcontroller does the Klxecu use?

The Klxecu is built around the ATtiny84-20P, from the AVR/Arduino family.

How big is the Klxecu PCB?

The Klxecu measures 129.5 × 73.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Klxecu?

70 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Klxecu design files?

From the JourneyMan61/klxecu repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Klxecu design in my own project?

The repository has no license, so all rights stay with JourneyMan61. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Klxecu 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.

Earlier revisions in the repo: klxecu

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