CANBoard_HW

CANBoard is a simple CAN enabled IO board, specifically designed to be used in devices like steering wheels/button boxes/panels/etc.

• 8 digital inputs
  • Ground switching
• 5 analog inputs
  • 5V max
• 4 digital outputs
  • Low side switch (open collector)
  • 0.5A max each
• STM32F303K8
• KiCad 7.0.0

Goals

• Create a low cost device that my friends and I can use in our project cars
• Use components that are easily soldered by hand (hence 0805) and are preferably from my stock of frequently used parts (ex: LD1117S33CTR)
• Share my work with others for reference, inspiration or collaboration.

If this project does help you in any way, I'd appreciate a message!

Disclaimer

This is a personal hobby project. I am not a professional. Use at your own risk.

Schematic

Schematic PDF

Images

Jumpers

CAN Term : Soldering this jumper enables the 120 ohm terminating resistor across CANL/CANH

CAN ID Jumpers 1 and 2 : Soldering these jumpers allows different base CAN IDs to be selected when using multiple CANBoards in the same bus

1	2	Base CAN ID (Hex)
Open	Open	0x640
Closed	Open	0x650
Open	Closed	0x660
Closed	Closed	0x670

Firmware

CANBoard firmware

Initial Programming

Use Tag Connect TC2030 cable

JLCPCB

Here are screenshots from the JLCPCB ordering process

From the main page JLCPCB

Click Add gerber

You should see these board dimensions

Select your PCB quantity here

Set your PCB specs (I usually select TG155)

I also like to select "Confirm Production File"

Click the PCB Assembly slider and set the settings below

Select "Confirm Parts Placement"

Upload the BOM and CPL files from the Export/V2/JLCPCB directory

Or from the directory of whichever version you would like to make

V2 should have 70 parts detected

Note: If there are values under "parts not selected" they are likely out of stock and they cannot be populated by JLCPCB

Either substitutes need to be found on their parts database or you will need to wait for them to restock

Review the BOM to make sure all of the parts are correct (not all parts shown here)

----IMPORTANT---

Review the the part placement (rotation)

It should look exactly as it does below

TAKE NOTE OF THE PINK CIRCLES THAT INDICATE PIN 1

MAKE SURE THE LED IS FACING THE CORRECT WAY - SMALL PINK LINE

Now you can add the board to your cart and place your order, have fun!