[chbot] PCB Power Supply.

[Daniel Powell]

Cheers Charles,

It’s ESP32 WRoom with onboard CAN. The MAX13487EESA  is package compatible with a TI SN65HVD230 Can Transceiver. I’ve got to do more research, but I believe it may not be pin compatible. None the less the ESP32 has three serial interfaces, if I can’t use the one presented to the RS465 chip I can simply construct a board for the transceiver and run it off the ESP32 pins allocated to the 433mhz subboard.

The remainder of the inputs opto isolated, the outputs also opto isolated MOSFET. Given it’s a cheap board, it’s one of the reasons I selected it. None the less at the moment my suspension position sensors and tyre temp sensors are battery driven and use ESPNow to transmit data.

As above I don’t think CAN is much of an issue. Just don’t know if I’m going to release smoke using car voltage rather than a regulated 12v.

Regards, Daniel.

From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of Charles Manning
Sent: Wednesday, 6 November 2024 12:13 pm
To: Christchurch Robotics <chchrobotics at lists.ourshack.com>
Subject: Re: [chbot] PCB Power Supply.

A couple of points...

On Wed, Nov 6, 2024 at 8:42 AM Daniel Powell <danielvieway at hotmail.com<mailto:danielvieway at hotmail.com>> wrote:
To preface, I know nothing about PCB design, nor much of anything about components.

I thought of using an off the shelf board for datalogging my race car. I've picked up a Kincony KC868-16 with the hopes of being able to float off the RS485 transceiver and replace it with a Canbus transceiver (Yeah, I'm going to screw this board!!)

Are you sure that is what you want to do?
RS485 is generally used with a UART and is used as a way to send serial data (ie. essentially RS232 with different voltages and multi-drop capability).

A CAN transceiver is generally used with a CAN controller to send CAN fames.

If you remove RS485 from a UART and then replace it with a CAN transceiver that won't change the UART into a CAN controller.

I don't know this board - maybe the pins are shared and this will be OK.


My issue. While I know the board is 12v tolerant and the xl1509 should handle the voltages seen in car (12-15v) I don't know if the remainder of the components will do so. Anyone with more firing neurons than me able to look at the diagram/pic below and tell me how quickly I'm going to release the smoke?

I think the power supply is only part of the question. What can come in via other connections.

Vehicles are particularly nasty places for electronics.



https://www.kincony.com/images/user-guide/manual/KC868-A16-images/ch00-power.png


https://www.kincony.com/images/user-guide/manual/KC868-A16-images/sh-00-power.jpg


Regards,
Daniel.

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