Model Train Utility Driver – Part 2

We have a lot of space on the Utility Driver, so I can afford to add some TVS diodes on the ports that go directly out. These are 3.3V and can only handle 6-12mA out – basically they can just about drive a Led with some care.

I also need to change UART0 pins + I would like to replace the RS485 port with an USB powered by CH340G – in which case the LM1117 can have a jumper selecting if it is powering 3.3V from USB or 12V. The advantage of this is that I get the Boot pin free.

I also need to add a pull-up on Reset and a way to Reset the ESP32.

And obviously – a power Led.

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