[chbot] PCB Power Supply.

[Martin Towers]

I used to make gizmos for the car. They worked fine on the bench and
blew up in the car. In a real car with a lead acid battery and
alternator there are a lot of spikes and surges from all the inductive
loads going on and off. Dirty battery contacts will blow things up.

Since then things seem easier. Semiconductors are harder. The regulator
xl1509 will survive up to 45V and that should be enough most of the
time. There is reverse voltage protection.

The CAN interface is just a conversion to the CAN dominant-recessive
electrical system. You can use the ESP32 TWAI controller to monitor the
CAN bus.

So it's a good plan.

Martin

PS
Let us know what colour the smoke is.