Arduino 12V analogue input

spr1nt3r · 2017-08-18 18:10:31

I would like to connect Arduino to brake light and indicator wire and register when the wire has current. How do I filter 12-17V down to 5V and also keep amps and interference to minimum? I am very new to electronics so please forgive my ignorance :o

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#32 31-08-2017 12:28PM

spr1nt3r

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Join Date: June 2008

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eeguy wrote: »

They're dropping the voltage across the resistor.
See the first note on increasing the resistance value for higher voltages.

If you look at any beginner LED project they usually have a 2-300 ohm resistor in series with the LED when powering from a 5V supply.

Thanks. Ordering a bunch of resistors, 1N4001 diodes and PC817 optocouplers. Seems to be dirt cheap coming from China.

Will also get blue insulated heatshrink butt wire connectors so I could cut existing wire, insert it back into this connector and also insert a 3rd wire for my monitoring needs. Heatshrink the hell out of it and we're done.

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