[chbot] PCB Power Supply.

[Daniel Powell]

Appreciated Martin,
I'm familiar with blowing stuff up (big and small). However my "play box" in the race car now regulates everything back to 5v USB. My TTGo TBeam and M5Stack devices run off this regulated 5v.
Plan for the new race car is to run the Kincony device off the powertrain CANBus and run a further device off the gateway (OBD2) CANBus. It'll allow me to run a set of gauges via ESPNow, and map out the ESP, which I'll hack either by faking the steering input or yaw sensor. However might be difficult to "fool" given I would think the limited bounds of ESP for road will probably not be suitable for dirt track.

Cheers, D

-----Original Message-----
From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of Martin Towers
Sent: Friday, 8 November 2024 10:46 am
To: chchrobotics at lists.ourshack.com
Subject: Re: [chbot] PCB Power Supply.

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.

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