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Mhi xy bus

iblue·mhi-xy-bus·aircohack/platine/mhixy.kicad_pcb

Mhi xy bus PCB layout, top view — open source AVR/Arduino board by iblue
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About the Mhi xy bus PCB

Mhi xy bus is an open source AVR/Arduino PCB design by iblue, published on GitHub. It is a 2-layer board measuring 91.4 × 40.6 mm, with 66 components from 37 distinct parts.

Its main chip is the ATMEGA328-AU, from the AVR/Arduino family. Other key parts include the LM358, LM317M, 78L05 and FT232RL. By type, the board carries 26 resistors, 15 capacitors, 9 transistors, 6 ICs, 3 connectors and 3 diodes.

It belongs with the test & measurement designs in this gallery.

From the project

Reverse engineering of the Mitsubishi Heavy Industries X/Y Bus as used in FDUM air condition

This directory contains research and development files for reverse engineering the Mitsubishi Heavy Industries (MHI) air conditioning X-Y bus communication protocol.

This project was never completed. The files are published in the hope that they may be useful to someone interested in the specifics of the MHI X-Y bus protocol. The protocol analysis is partially complete, and the hardware designs reached prototype stage but were not finalized.

Main components on the Mhi xy bus

LM358LM317MATMEGA328-AU78L05FT232RL

Mhi xy bus bill of materials (BOM)

66 components, 37 distinct parts.

QtyPartRefs
1
LM358
U1
2
LM317M
U2, U3
1
ATMEGA328-AU
U4
1
78L05
U5
1
FT232RL
U6
1
BC857A
Q1
4
BC807-40
Q2, Q5, Q7, Q9
3
BC847C
Q3, Q6, Q8
1
BC817-40
Q4
1
16MHz
Y1
1
MHI Bus
J1
1
ISP
J2
1
USB_OTG
J3
1
Polyfuse
F1
2
50k
RV1, RV2
1
BAT54S
D1
2
BAT54
D2, D3
1
47n
C1
1
4700u
C2
2
22u
C3, C4
Show 17 more
QtyPartRefs
2
100u
C5, C6
2
1u
C7, C8
2
4u7
C9, C11
3
100n
C10, C12, C13
2
12p
C14, C15
1
47k
R1
3
220k
R2, R3, R11
4
25k
R4, R5, R6, R7
1
1
R8
1
2k2
R9
1
22k
R10
6
10k
R12, R13, R19, R21, R22, R24
3
1k
R14, R25, R26
2
220
R15, R17
1
3k9
R16
1
1k8
R18
2
100k
R20, R23

Mhi xy bus design files

The KiCad project lives in the iblue/mhi-xy-bus repository on GitHub; these links point at the commit this page was built from.

Mhi xy bus: common questions

What microcontroller does the Mhi xy bus use?

The Mhi xy bus is built around the ATMEGA328-AU, from the AVR/Arduino family.

How big is the Mhi xy bus PCB?

The Mhi xy bus measures 91.4 × 40.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mhi xy bus?

66 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mhi xy bus design files?

From the iblue/mhi-xy-bus repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Mhi xy bus design in my own project?

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

Can I test firmware for the Mhi xy bus 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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