LCD in car shows random characters scrolling

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hi!

i using arduino in car , lcd (hd44780) starting scroll random characters fast when engine running. think voltage related issue. arduino mega 2560 r3 (chinese clone) connected though power input socket , connects radio's +12v. when engine running around 13-14.4volts, maybe thats problem.

should use voltage regulator capacitors create more stable voltage, 8-10v? or have other suggestions?

thank you.

you need automotive noise , surge suppressor circuit between 12v socket , project.

the electrical system in car extremely hazardous electronics, possible polarity reversals , voltage spikes exceeding 600 v.

normally, instructables complete crap, this 1 describes possibly useful automotive surge suppressor can try.


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