CANBoard_FW

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

Versions

Current software versions used:

• CubeIDE V1.11.2
• CubeMX V6.7.0
• FW_F3 V1.11.3

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.

CAN

Currently configured as 500 Kbps only

Message Format - Inputs

Messages sent from the CANBoard

The BASE_ID is set using the 1 and 2 solder jumpers, see CANBoard hardware for more info

• Analog Inputs : millivolt readings
• STM32 Temperature : Temperature in celsius as reported by STM32
• Rotary : Position of a rotary switch wired to each analog input
  • Needs work on scaling for different numbers of positions
• Digital Inputs : Bits representing the state of each switch input
• Analog/Dig Inputs : Bits representing the analog inputs used as digital inputs
  • Value over half scale (2.5V) the input is true (1)
• Output States : Bits representing the digital output states
• Heartbeat : Value incremented every transmit (uint8_t)

Message Format - Outputs

Messages sent to the CANBoard

• Outputs : must be value 1 or 0

Hardware

CANBoard hardware