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Simple automotive question

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It's not bad, either positive or negative requires pretty much the same treatment. I have designed many products used in autos and trucks. A resistor, a capacitor, and a Zener diode is ample protection for an input pin. If you are using the internal pullup or pulldown in the MSP430 then it might influence the choice of resistor value, use a higher value if you are sensing a 12V signal(4.7K or 10K is fine). But the basic three parts are all you need. Use a white or blue LED if you don't have a 3.3V Zener. Or two reds in series.

Regards, Bob

Really happy with this setup. Works great and fits my needs perfect. Thank you so much.


And thanks everybody for your input [emoji16]


Best regards,


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