HardLabs

Obd32

mkrasselt1·obd32·pcb/obd32.kicad_pcb

Obd32 PCB layout, top view — open source ESP32 board by mkrasselt1

About the Obd32 PCB

Obd32 is an open source ESP32 PCB design by mkrasselt1, published on GitHub. It is a 2-layer board measuring 53.9 × 53.1 mm, with 76 components from 53 distinct parts.

Its main chip is the ESP32-WROOM-32, from the ESP32 family. Other key parts include the LMR33630BDDA, AZ1117C-3.3, CP2102N-A01-GQFN24, ICM-20689 and BMP388. By type, the board carries 23 capacitors, 20 resistors, 9 ICs, 9 connectors, 8 diodes and 3 switches.

It belongs with the iot & wireless designs in this gallery.

From the project

Anyone is free to join our goal to make the hardware reliable and affordable.

Anyone is free to join our goal to make the hardware reliable and affordable.

current plan conatins the featureset of:

- esp32 based microprocessor - direct canbus via tranciever chip MCP2562-e - db9 for obd2 connection - wifi connection to hotsport or - onboard switchable usb port for lte-wifi-router - ~~bluetooth connection compatible with elm327ds~~ - micro sd card slot for configuration, logging and cache - ota updates via github releases - build in webfrontend - low power sleep mode (canbus activity and battery voltage) - gps for location and altitude sync - communication protocolls…

Main components on the Obd32

LMR33630BDDAESP32-WROOM-32AZ1117C-3.3CP2102N-A01-GQFN24ICM-20689BMP388MCP2562-E-MFSIP32431DR3MAX-M8W

Obd32 bill of materials (BOM)

76 components, 53 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LMR33630BDDA
FT231XQ
U1
1
ESP32-WROOM-32
U2
1
AZ1117C-3.3
U3
1
CP2102N-A01-GQFN24
LMR33640DDDA
U4
1
ICM-20689
U5
1
BMP388
U6
1
MCP2562-E-MF
MCP2562FD-E-MF
U7
1
SIP32431DR3
SiP32431DR3
U8
1
MAX-M8W
U9
2
BC817
Q1, Q2
1
67329-8040
J1
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J2
1
OBD2
J3
1
Conn_02x05_Odd_Even
J4
1
Conn_02x05_Odd_Even
J5
1
Micro_SD_Card
J6
1
U.FL-R-SMT-101
J7
2
Conn_01x04_Male
J8, J9
1
Polyfuse
F1
3
SW_Push
SW1, SW2, SW3
Show 33 more
QtyPartRefs
3
LED
D1, D2, D3
1
SM6T18A
D4
2
D_Schottky
D5, D8
1
SP0503BAHT
D6
1
D_Zener
D7
1
3.3uH 4A 16mR
L2
1
100nF
C1
2
1uF
C2, C10
1
220NF
100nF
C3
2
10uF
C4, C6
4
22uF
C5, C12, C13, C25
1
10uF 20V
C7
1
220nF 20V
C8
7
0.1uF
C9, C11, C16, C18, C19, C20, C21
1
10NF
10nF
C14
1
0.47uF
C15
2
100NF
100nF
C17, C22
2
4K7
R1, R2
1
10K
R3
2
65R
64.9R
R4, R5
1
4.99R
R6
2
100K
R10, R21
1
27K
R11
1
100K
200K
R12
1
24.9K
22K
R13
1
5.1K
R14
1
5.1K
R15
1
5.1K
27R
R16
1
120R
R17
1
10R
R18
1
27R
R19
1
24.9K
R22
2
10K
R23, R24

Obd32 design files

The KiCad project lives in the mkrasselt1/obd32 repository on GitHub; these links point at the commit this page was built from.

Obd32: common questions

What microcontroller does the Obd32 use?

The Obd32 is built around the ESP32-WROOM-32, from the ESP32 family.

How big is the Obd32 PCB?

The Obd32 measures 53.9 × 53.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Obd32?

76 components, from 53 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 Obd32 design files?

From the mkrasselt1/obd32 repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Obd32 design in my own project?

The repository has no license, so all rights stay with mkrasselt1. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Obd32 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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