HardLabs

OBD to AHU

joshajohnson·car-hacking·hardware/obd-ahu/obd-ahu.kicad_pcb

OBD to AHU PCB layout, top view — open source AVR/Arduino board by joshajohnson

About the OBD to AHU PCB

OBD to AHU is an open source AVR/Arduino PCB design by joshajohnson, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 69.5 × 68.6 mm, with 35 components from 25 distinct parts.

Its main chip is the Sea-Micro, from the AVR/Arduino family. Other key parts include the MCP2551-I-SN, MCP2515-xST and LV284X. By type, the board carries 13 resistors, 7 capacitors, 4 ICs, 3 diodes, 2 connectors and 2 test points.

From the project

A repo for assorted tools, projects, and documentation.

Main components on the OBD to AHU

Sea-MicroMCP2551-I-SNMCP2515-xSTLV284X

OBD to AHU bill of materials (BOM)

35 components, 25 distinct parts.

QtyPartRefs
1
Sea-Micro
U1
1
MCP2551-I-SN
U2
1
MCP2515-xST
U3
1
LV284X
U4
1
DTC123J
Q1
1
TAXM16M4RDBCCT2T
16MHz
TAE(Zhejiang Abel Elec)
Y1
1
OBD
J1
1
ACC/REMOTE
J2
1
500mA
F1
1
CAN_H
TP1
1
CAN_L
TP2
1
ESDCAN24
D1
2
MBR120
D2, D3
1
10u
L1
3
100n
C1, C2, C5
2
CL10C150JB8NNNCr
15p
Samsung Electro-Mechanicsr
C3, C4
1
2u2
C6
1
10u
C7
6
0R
R1, R2, R5, R6, R7, R9
2
0R
R3, R4
Show 5 more
QtyPartRefs
1
5K1
R8
1
100K
R10
1
54k9
R11
1
1K
R12
1
10k
R13

OBD to AHU design files

The KiCad project lives in the joshajohnson/car-hacking repository on GitHub; these links point at the commit this page was built from.

OBD to AHU: common questions

What microcontroller does the OBD to AHU use?

The OBD to AHU is built around the Sea-Micro, from the AVR/Arduino family.

How big is the OBD to AHU PCB?

The OBD to AHU measures 69.5 × 68.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OBD to AHU?

35 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the OBD to AHU design files?

From the joshajohnson/car-hacking repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the OBD to AHU design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which joshajohnson chose for the repository.

Can I test firmware for the OBD to AHU 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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