Electronics > Beginners
Sequential tail lights
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Mr. Scram:
People here have mentioned filtering the car's power to prevent mishaps. What would be suitable ways of doing that? Voltage clamping using diodes to prevent spikes from blowing up your circuit? Inline inductors to smooth high frequency noise? An RC circuit to smooth out lower frequency pollution?
james_s:
A reasonable starting point would be to look at some other automotive electronics to see how it's done. Often it's nothing more than a regulator intended for automotive use and some suitably high voltage capacitors. You can go fancier if you want, but I've found that even in my oldest car (1984) the electrical system is not too horrendously nasty. Something from the mid 70s or older with an electromechanical regulator back when the only electronics in a typical car was an AM radio would probably be a lot worse.
Mr. Scram:

--- Quote from: james_s on September 27, 2018, 12:03:53 am ---A reasonable starting point would be to look at some other automotive electronics to see how it's done. Often it's nothing more than a regulator intended for automotive use and some suitably high voltage capacitors. You can go fancier if you want, but I've found that even in my oldest car (1984) the electrical system is not too horrendously nasty. Something from the mid 70s or older with an electromechanical regulator back when the only electronics in a typical car was an AM radio would probably be a lot worse.

--- End quote ---
Fair point. It's cheaper to properly regulate the circuit than to protect every one of the hundreds circuits that are now inside a car individually.

Now I want to drive around with an oscilloscope hooked up to the power system.
james_s:
I actually meant a regulator inside the device, I've worked on ECUs that had relatively ordinary 3 terminal regulators to supply the 5V. Usually 35V rated capacitors and some ceramic bypass caps, nothing too fancy. Something like a 7805 can tolerate around 35V on the input for short periods, limited by the heat produced dropping that much voltage.
robjodicarter:
So how can I write the code for this style I will be using a sheet of LED's that are 20 high x100 long. Is there some sort of cheat or pre written code for this? I don't mind taking my time and learning just want it to be cool.
https://youtu.be/tH_vNb1zkDw
Thank you
Rob

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