RejsaCAN = ESP32 + CAN

MagnusThome

I got tired of my stacked multiple boards and extra components so I made a small board that has exactly what I wanted:

ESP32
CAN bus port that can be plugged in directly to the OBD2 port or be connected directly to any of the cars CAN buses.
Powered by the car's 12V with automatic shutdown (so it can stay plugged into the OBD2 port or example)

So with this small board I not only have CAN but Wifi with all networking you can think of, Bluetooth/BLE, USB... plus both SPI and 12C buses to connect to just about any sensor, display or other peripherals to drive, sense or measure. And some extra pins for ADC, DAC, PWM...

Small. I like small :blush:

I had JLCPCB make ten boards but gave away some of them to friends so I made another batch :smiley: If anyone is interested in a board, first read through the different pages on github (link below) and then email me.

https://github.com/MagnusThome/RejsaCAN-ESP32

I also made an even smaller housing:

aol

This is wonderful! Haven't had the time to tinker with it yet, but it seems perfect. You need to send me the connector and the box at some point :smile:

aaronc7

Very cool! Another open source project that I'm helping out with, we use the Macchina A0. Same idea, esp32 in a small package. Of course it's a little overpriced for what it is, but I was fine with $70 USD delivered for such an easy solution.

A guy wrote BLE to ISOTP20 firmware and phone app, we are doing high speed ram logging and ecu flashing over ble.

https://www.macchina.cc/catalog/a0-boards/a0-under-dash

https://github.com/bri3d/esp32-isotp-ble-bridge

timurrrr

Sweet! I was thinking about doing something very similar, and even started designing a custom board on JLCPCB, but one of the chips I used is permanently out of stock. Glad you were able to find better alternatives!

MagnusThome

ELM327 support by using ESP32RET!

https://github.com/collin80/ESP32RET

MagnusThome

Machina A0 is very similar hardware, it's a very nice piece of kit too

TriB

Very nice solution! I more or less just start with reverse engineering CAN-Bus, and used to work with K-Line in the past. This seems to be a very good startingpoint! I´ll follow the project :)

farbstoffe_beg

Neat solution. I really like small footprint and obviously the open source sw and esp world behind it. Do you still have one of the boards available for shipping? I’d really appreciate one of these. Living in Europe as well.

MagnusThome

Currently all out. I've ordered a few more boards but they've ended up a bit more expensive. Email me at magnust@gmail.com if you're still interested. I actually also made a few using engineering samples of the brand new ESP32-S3 and an SD card slot and a switchable 3,3V 400mA output.

MagnusThome

@aol Did I send you a housing and OBD2 plug?

aol

@MagnusThome nope, if you have them please send :smile:

MagnusThome

Will do!

W00ls

Hi @timurrrr @MagnusThome

I am struggling to get the rejsaCAN v3.x running with Racechrono to log CAN-data (Powertrain CAN). Since I am not that deep in programming /protocols and my time is limited to dive in this stuff I would like to ask for an code which is already adapted to this board. If there aren't any ready solutions available I would pay for the service.

markorussell

Hi Magnus,

I’m currently building a RejsaCAN v3.4 based setup and I need some information about the OBD2 plug/connector PCB.

I found the RejsaCAN v3.x OBD2 plug - Gerber.zip in the GitHub repository, but it appears that the OBD2 plug does not include a separate BOM or CPL/Pick & Place file.

I would like to order the OBD2 plug PCB as a fully assembled board from JLCPCB/PCBWay, so I’m looking for the exact original component information.

Could you please provide, if available:

The exact manufacturer and MPN/part number of the 16-pin OBD-II connector used on the RejsaCAN OBD2 plug.
The exact connector model/part number used for the sandwich-mounted OBD2 version.
The exact connector model/part number used for the 90-degree OBD2 version, if it is different.
The original BOM for the OBD2 plug PCB.
The original CPL / Pick & Place / Part Placement file for the OBD2 plug PCB.
The exact PCB footprint used for the OBD2 connector.
Any resistor, capacitor, diode, fuse or other components installed on the OBD2 plug PCB, including their values and part numbers.
The correct orientation/rotation of the OBD2 connector and other components.
If the OBD2 plug is intended to be assembled directly onto the RejsaCAN v3.x board, any mechanical dimensions or assembly instructions would also be very helpful.
If you have the original JLCPCB order/assembly files, production files, or the component list that you used when you manufactured these boards, could you please share them?

I’m specifically looking for the original parts rather than choosing compatible parts myself, because I want the finished PCB to have the same mechanical fit and connector position as the original RejsaCAN design.

I do not want to hand-solder the OBD2 connector. I want to order the PCB with the connector/components already assembled by the PCB manufacturer.

If you still have any assembled RejsaCAN OBD2 plugs available for purchase, I would also be interested in buying one.

Thank you very much for your help and for making RejsaCAN open source.

Best regards

markorussell

@aol Hi Magnus,

I’m currently building a RejsaCAN v3.4 based setup and I need some information about the OBD2 plug/connector PCB.

I found the RejsaCAN v3.x OBD2 plug - Gerber.zip in the GitHub repository, but it appears that the OBD2 plug does not include a separate BOM or CPL/Pick & Place file.

I would like to order the OBD2 plug PCB as a fully assembled board from JLCPCB/PCBWay, so I’m looking for the exact original component information.

Could you please provide, if available:

The exact manufacturer and MPN/part number of the 16-pin OBD-II connector used on the RejsaCAN OBD2 plug.
The exact connector model/part number used for the sandwich-mounted OBD2 version.
The exact connector model/part number used for the 90-degree OBD2 version, if it is different.
The original BOM for the OBD2 plug PCB.
The original CPL / Pick & Place / Part Placement file for the OBD2 plug PCB.
The exact PCB footprint used for the OBD2 connector.
Any resistor, capacitor, diode, fuse or other components installed on the OBD2 plug PCB, including their values and part numbers.
The correct orientation/rotation of the OBD2 connector and other components.
If the OBD2 plug is intended to be assembled directly onto the RejsaCAN v3.x board, any mechanical dimensions or assembly instructions would also be very helpful.
If you have the original JLCPCB order/assembly files, production files, or the component list that you used when you manufactured these boards, could you please share them?

I do not want to hand-solder the OBD2 connector. I want to order the PCB with the connector/components already assembled by the PCB manufacturer.

If you still have any assembled RejsaCAN OBD2 plugs available for purchase, I would also be interested in buying one.

Thank you very much for your help and for making RejsaCAN open source.

Best regards

nbdnnm

Magnus is @MagnusThome